Social media graphic used for promoting the 2023 update to the National Seismic Hazard Model | U.S. Geological Survey (usgs.gov)
Julie A Herrick
Julie Herrick is a Geophysicist with the Earthquake Hazards Program.
Professional Experience
Geophysicist, USGS Geologic Hazards Science Center (2022–Present)
Geologist, USGS Denver Scientific Publishing Network (2014–2022)
Volcanologist, Smithsonian Global Volcanism Program (2011–2014)
Peace Corps Volunteer, Sector de Salud y Ambiental en la Comarca Chiriquí de Panamá (2007–2009)
Education and Certifications
Michigan Technological University
Boston University
Smith College
Abstracts and Presentations
(selections)
Herrick JA, Briggs R, Hatem AE, Jobe JT, Brink U, Stephenson WJ, Lindberg NS, Leeds AL, Lynch EM, Powell JH, Miller NC (2025) Geologic and seismotectonic data for the 2026 American Samoa and Mariana Islands National Seismic Hazard Model Update, in Abstracts for Poster Presentations at 2025 Seismological Society of America Annual Meeting, Baltimore, Maryland, 14–18 Apr.
Herrick JA, Petersen MD, Boyd OS, Aagaard BT and Moschetti MP (2024) Amplification model components for Puerto Rico and the U.S. Virgin Islands, Latin American and Caribbean Seismological Commission (LACSC), 5th Assembly, San Jose, Costa Rica, 24–28 Jun.
Herrick JA, Rukstales KS, Altekruse JM and Powers PM (2024) The 2023 Alaska National Seismic Hazard Model: Inputs and Implications, in Abstracts for Poster Presentations at 2024 Seismological Society of America Annual Meeting, Anchorage, Alaska, 1–3 May, Seismological Research Letters.
Herrick JA, Shumway AM and Thompson Jobe JA (2023) Geospatial scope of the 2025 Puerto Rico-U.S. Virgin Islands National Seismic Hazard Model update, in Abstracts for Poster Presentations at 2023 Seismological Society of America Annual Meeting, San Juan, Puerto Rico, 17–20 Apr., Seismological Research Letters.
Herrick JA and Langseth ML (2019) USGS expanding access to geospatial publications, AGU Fall Meeting, San Francisco, Calif., 9–13 Dec.
Herrick JA, De Angelis S and Toscano MA (2017) Provenance of floating pumice in the Caribbean—Big data and hierarchical clustering, IAVCEI, Portland, Ore., USA, 14–18 Aug.
Herrick JA and Hess AJ (2017) From the field to publication—Integration of GIS throughout the mapping process, USGS Denver, Digital Mapping Techniques workshop, Minnesota Geological Survey, Minneapolis, Minn., 21–24 May.
Herrick JA, Hosseini M and Yong A (2017) Comparing earthquake-based P-wave and traditional array-based methods for obtaining VS30, in Abstracts for Poster Presentations at 2017 Seismological Society of America Annual Meeting, Denver, Colo., 17–19 Apr., Seismological Research Letters.
Science and Products
The 2023 US National Seismic Hazard Model: Ground-motion characterization for the conterminous United States
We update the ground-motion characterization for the 2023 National Seismic Hazard Model (NSHM) for the conterminous United States. The update includes the use of new ground-motion models (GMMs) in the Cascadia subduction zone; an adjustment to the central and eastern United States (CEUS) GMMs to reduce misfits with observed data; an updated boundary for the application of GMMs for...
Authors
Morgan P. Moschetti, Brad T. Aagaard, Sean Kamran Ahdi, Jason M. Altekruse, Oliver S. Boyd, Arthur Frankel, Julie Herrick, Mark D. Petersen, Peter M. Powers, Sanaz Rezaeian, Allison Shumway, James Andrew Smith, William J. Stephenson, Eric M. Thompson, Kyle Withers
Earthquake rupture forecast model construction for the 2023 U.S. 50‐State National Seismic Hazard Model Update: Central and eastern U.S. fault‐based source model
As part of the U.S. Geological Survey’s 2023 50‐State National Seismic Hazard Model (NSHM), we make modest revisions and additions to the central and eastern U.S. (CEUS) fault‐based seismic source model that result in locally substantial hazard changes. The CEUS fault‐based source model was last updated as part of the 2014 NSHM and considered new information from the Seismic Source...
Authors
Allison Shumway, Mark D. Petersen, Gabriel Toro, Peter M. Powers, Jason M. Altekruse, Julie Herrick, Kenneth S. Rukstales, Jessica Ann Thompson Jobe, Alexandra Elise Hatem, Demi Leafar Girot
The 2023 US 50-State National Seismic Hazard Model: Overview and implications
The US National Seismic Hazard Model (NSHM) was updated in 2023 for all 50 states using new science on seismicity, fault ruptures, ground motions, and probabilistic techniques to produce a standard of practice for public policy and other engineering applications (defined for return periods greater than ∼475 or less than ∼10,000 years). Changes in 2023 time-independent seismic hazard...
Authors
Mark D. Petersen, Allison Shumway, Peter M. Powers, Ned Field, Morgan P. Moschetti, Kishor S. Jaiswal, Kevin R. Milner, Sanaz Rezaeian, Arthur Frankel, Andrea L. Llenos, Andrew J. Michael, Jason M. Altekruse, Sean Kamran Ahdi, Kyle Withers, Charles Mueller, Yuehua Zeng, Robert Edward Chase, Leah Marschall Salditch, Nico Luco, Kenneth S. Rukstales, Julie Herrick, Demi Leafar Girot, Brad T. Aagaard, Adrian M. Bender, Michael L. Blanpied, Richard W. Briggs, Oliver S. Boyd, Brandon Clayton, Christopher DuRoss, Eileen Evans, Peter J. Haeussler, Alexandra Elise Hatem, Kirstie Lafon Haynie, Elizabeth H. Hearn, Kaj M. Johnson, Zachary Alan Kortum, N. Simon Kwong, Andrew James Makdisi, Henry (Ben) Mason, Daniel McNamara, Devin McPhillips, Paul G. Okubo, Morgan T. Page, Frederick Pollitz, Justin L. Rubinstein, Bruce E. Shaw, Zheng-Kang Shen, Brian Shiro, James Andrew Smith, William J. Stephenson, Eric M. Thompson, Jessica Ann Thompson Jobe, Erin Wirth, Robert Witter
The USGS 2023 Conterminous U.S. time‐independent earthquake rupture forecast
We present the 2023 U.S. Geological Survey time‐independent earthquake rupture forecast for the conterminous United States, which gives authoritative estimates of the magnitude, location, and time‐averaged frequency of potentially damaging earthquakes throughout the region. In addition to updating virtually all model components, a major focus has been to provide a better representation...
Authors
Ned Field, Kevin R. Milner, Alexandra Elise Hatem, Peter M. Powers, Frederick Pollitz, Andrea L. Llenos, Yuehua Zeng, Kaj M. Johnson, Bruce E. Shaw, Devin McPhillips, Jessica Ann Thompson Jobe, Allison Shumway, Andrew J. Michael, Zheng-Kang Shen, Eileen Evans, Elizabeth H. Hearn, Charles Mueller, Arthur Frankel, Mark D. Petersen, Christopher DuRoss, Richard W. Briggs, Morgan T. Page, Justin L. Rubinstein, Julie Herrick
A probabilistic framework to model distributions of VS30
The time‐averaged shear‐wave velocity in the upper 30 m depth from the ground surface, or VS30, is often used as a predictor to describe local site effects in ground‐motion models. Although VS30 is typically determined from in situ measurements, it is not always feasible to obtain such measurements due to project restrictions or site accessibility. This motivates the development and use...
Authors
Utkarsh Mital, Sean Kamran Ahdi, Julie Herrick, Junko Iwahashi, Alexandros Savvaidis, Alan K. Yong
VS30 and Dominant Site Frequency (fd) as Provisional Station ML Corrections (dML) in California
New seismic stations added to a regional seismic network cannot be used to calculate local magnitude (ML) until a revised regionwide amplitude decay function is developed. Each station must record a minimum number of local and regional earthquakes that meet specific amplitude requirements prior to recalibration of the amplitude decay function. Station component adjustments (dML...
Authors
Alan K. Yong, Elizabeth S. Cochran, Jennifer R Andrews, Kenneth Hudson, Ellen Yu, Antony J. Martin, Julie Herrick, Jessica Dozal
Divisions of geologic time—Major chronostratigraphic and geochronologic units
IntroductionEffective communication in the geosciences requires a consistent nomenclature for stratigraphic units and, especially, for divisions of geologic time. A geologic time scale is composed of standard stratigraphic divisions based on rock sequences and is calibrated in years.Geologists from the U.S. Geological Survey (USGS), State geological surveys, academia, and other...
Authors
2012 volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory
The Alaska Volcano Observatory (AVO) responded to eruptions, possible eruptions, volcanic unrest, or suspected unrest at 11 volcanic centers in Alaska during 2012. Of the two verified eruptions, one (Cleveland) was clearly magmatic and the other (Kanaga) was most likely a single phreatic explosion. Two other volcanoes had notable seismic swarms that probably were caused by magmatic...
Authors
Julie Herrick, Christina A. Neal, Cheryl E. Cameron, James P. Dixon, Robert G. McGimsey
2010 Volcanic activity in Alaska, Kamchatka, and the Kurile Islands: Summary of events and response of the Alaska Volcano Observatory
The Alaska Volcano Observatory (AVO) responded to eruptions, possible eruptions, volcanic unrest or suspected unrest at 12 volcanic centers in Alaska during 2010. The most notable volcanic activity consisted of intermittent ash emissions from long-active Cleveland volcano in the Aleutian Islands. AVO staff also participated in hazard communication regarding eruptions or unrest at seven...
Authors
Christina A. Neal, Julie Herrick, Olga A. Girina, Marina Chibisova, Alexander Rybin, Robert G. McGimsey, Jim Dixon
Non-USGS Publications**
Herrick, J.A, Siebert, L., and Rose, W.I., 2013, Large-volume Barriles and Caisán debris avalanche deposits from Volcán Barú, Panama, in: Rose, W.I., Palma, J.L., Granados, H.D., and Varley, N., eds. Understanding open-vent volcanism and related hazards, GSA Special Publication 498, p. 141–162, https://doi.org/10.1130/2013.2498(09).
Global Volcanism Program, 2011. Report on Arenal (Costa Rica) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201104-345033
Global Volcanism Program, 2011. Report on Irazu (Costa Rica) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201104-345060
Global Volcanism Program, 2011. Report on Merapi (Indonesia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201105-263250
Global Volcanism Program, 2011. Report on Galeras (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201105-351080
Global Volcanism Program, 2011. Report on Fuego (Guatemala) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:6. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201106-342090
Global Volcanism Program, 2011. Report on Suwanosejima (Japan) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201107-282030
Global Volcanism Program, 2011. Report on Kirishimayama (Japan) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201107-282090
Global Volcanism Program, 2011. Report on Aira (Japan) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201110-282080
Global Volcanism Program, 2011. Report on Concepcion (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201110-344120
Global Volcanism Program, 2011. Report on Telica (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:11. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201111-344040
Global Volcanism Program, 2011. Report on San Cristobal (Nicaragua) (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201112-344020
Global Volcanism Program, 2012. Report on Cerro Negro (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201201-344070
Global Volcanism Program, 2012. Report on Momotombo (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201202-344090
Global Volcanism Program, 2012. Report on Mombacho (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201202-344110
Global Volcanism Program, 2012. Report on Maderas (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201203-344130
Global Volcanism Program, 2012. Report on Masaya (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201204-344100
Global Volcanism Program, 2012. Report on Galeras (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201204-351080
Global Volcanism Program, 2012. Report on Popocatepetl (Mexico) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201205-341090
Global Volcanism Program, 2012. Report on Masaya (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:6. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201206-344100
Global Volcanism Program, 2012. Report on Nevado del Ruiz (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201207-351020
Global Volcanism Program, 2012. Report on Nevado del Ruiz (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201208-351020
Global Volcanism Program, 2012. Report on San Cristobal (Nicaragua) (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201208-344020
Global Volcanism Program, 2012. Report on Sotara (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201209-351061
Global Volcanism Program, 2012. Report on Purace (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201209-351060
Global Volcanism Program, 2012. Report on Popocatepetl (Mexico) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201209-341090
Global Volcanism Program, 2012. Report on Nevado del Huila (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201210-351050
Global Volcanism Program, 2012. Report on Machin (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:11. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201211-351040
Global Volcanism Program, 2012. Report on Pagan (United States) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201212-284170
Global Volcanism Program, 2013. Report on Nevado del Huila (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201301-351050
Global Volcanism Program, 2013. Report on San Cristobal (Nicaragua) (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201301-344020
Global Volcanism Program, 2013. Report on Dona Juana (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201301-351070
Global Volcanism Program, 2013. Report on Cumbal (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201302-351100
Global Volcanism Program, 2013. Report on Galeras (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201303-351080
Global Volcanism Program, 2013. Report on Azufral (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201303-351090
Global Volcanism Program, 2013. Report on Kizimen (Russia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201304-300230
Global Volcanism Program, 2013. Report on Fuego (Guatemala) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201305-342090
Global Volcanism Program, 2013. Report on Cerro Bravo (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:6. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201306-351012
Global Volcanism Program, 2013. Report on Nevado del Tolima (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:6. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201306-351030
Global Volcanism Program, 2013. Report on Sangay (Ecuador) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201307-352090
Global Volcanism Program, 2013. Report on Chaiten (Chile) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201308-358041
Global Volcanism Program, 2013. Report on Puyehue-Cordon Caulle (Chile) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201309-357150
Global Volcanism Program, 2013. Report on Copahue (Chile-Argentina) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201309-357090
Global Volcanism Program, 2013. Report on Apoyeque (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201310-344091
Global Volcanism Program, 2013. Report on Cerro Negro (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201310-344070
Global Volcanism Program, 2013. Report on Cleveland (United States) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201310-311240
Global Volcanism Program, 2013. Report on Planchon-Peteroa (Chile) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:11. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201311-357040
Global Volcanism Program, 2013. Report on Mauna Kea (United States) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201312-332030
Global Volcanism Program, 2014. Report on Galeras (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201401-351080
Global Volcanism Program, 2014. Report on Telica (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201402-344040
Global Volcanism Program, 2014. Report on Santa Maria (Guatemala) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201403-342030
Global Volcanism Program, 2014. Report on Fuego (Guatemala) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201404-342090
Global Volcanism Program, 2014. Report on Kilauea (United States) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201405-332010
Global Volcanism Program, 2014. Report on Kusatsu-Shiranesan (Japan) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:6. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201406-283120
Global Volcanism Program, 2014. Report on Nevado del Ruiz (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201407-351020
Global Volcanism Program, 2014. Report on Kikai (Japan) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201407-282060
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
2025 PRVI NSHM Update & Beyond Workshop
The National Seismic Hazard Model Project (NSHMP) will be presenting preliminary results of the 2025 Puerto Rico and U.S. Virgin Islands NSHM Update at this public workshop. On Day 1 we will focus on the 2025 PRVI update and on Day 2 we will present current data collection activities. These presentations will be technical but we encourage participation from users and stakeholders.
2023 50-State NSHM Update Workshop
The National Seismic Hazard Model Project (NSHMP) will be presenting final results of the 2023 50-State NSHM Update at this public workshop.
Earthquake geology inputs for the National Seismic Hazard Model (NSHM) 2025 (Puerto Rico and U.S. Virgin Islands), version 1.0
This Data Release contains preliminary versions of three related geologic input databases for the Puerto Rico and U.S. Virgin Islands (PRVI) region (62°–70° W and 16°–21° N) of the United States: 1) A fault sections database (“NSHM2025_FaultSections_PRVI_v1’”), which depicts the geometry of faults capable of hosting independent earthquakes, 2) a fault-zone polygon database ("NSHM2025...
Data Release for the 2023 U.S. 50-State National Seismic Hazard Model - Overview
This data release contains data sets associated with the 2023 50-State National Seismic Hazard Model Update. The 2023 50-State National Seimsic Hazard Model (NSHM) Update includes an update to the NSHMs for the conterminous U.S (CONUS, last updated in 2018), Alaska (AK, last updated in 2007), and Hawaii (last updated in 2001). Data sets include inputs like seismicity catalogs used as...
Data Release - Geologic map of the central Upper Peninsula, Michigan
This dataset supports the publication "Geophysical insights into Paleoproterozoic tectonics along the southern margin of the Superior Province, central Upper Peninsula, Michigan, USA." At a 1:100,000 scale, these data are in a geologic database in the Geologic Map Schema (GeMS) which includes spatial feature classes and non-spatial tables that contain the geologic information presented...
Updated Compilation of VS30 Data for the United States
VS30, the time-averaged shear-wave velocity (VS) to a depth of 30 meters, is a key index adopted by the earthquake engineering community to account for seismic site conditions. VS30 is typically based on geophysical measurements of VS derived from invasive and noninvasive techniques at sites of interest. Owing to cost considerations, as well as logistical and environmental concerns, VS30...
Where Do Earthquakes Occur?
Social media graphic used for promoting the 2023 update to the National Seismic Hazard Model | U.S. Geological Survey (usgs.gov)
Science and Products
The 2023 US National Seismic Hazard Model: Ground-motion characterization for the conterminous United States
We update the ground-motion characterization for the 2023 National Seismic Hazard Model (NSHM) for the conterminous United States. The update includes the use of new ground-motion models (GMMs) in the Cascadia subduction zone; an adjustment to the central and eastern United States (CEUS) GMMs to reduce misfits with observed data; an updated boundary for the application of GMMs for...
Authors
Morgan P. Moschetti, Brad T. Aagaard, Sean Kamran Ahdi, Jason M. Altekruse, Oliver S. Boyd, Arthur Frankel, Julie Herrick, Mark D. Petersen, Peter M. Powers, Sanaz Rezaeian, Allison Shumway, James Andrew Smith, William J. Stephenson, Eric M. Thompson, Kyle Withers
Earthquake rupture forecast model construction for the 2023 U.S. 50‐State National Seismic Hazard Model Update: Central and eastern U.S. fault‐based source model
As part of the U.S. Geological Survey’s 2023 50‐State National Seismic Hazard Model (NSHM), we make modest revisions and additions to the central and eastern U.S. (CEUS) fault‐based seismic source model that result in locally substantial hazard changes. The CEUS fault‐based source model was last updated as part of the 2014 NSHM and considered new information from the Seismic Source...
Authors
Allison Shumway, Mark D. Petersen, Gabriel Toro, Peter M. Powers, Jason M. Altekruse, Julie Herrick, Kenneth S. Rukstales, Jessica Ann Thompson Jobe, Alexandra Elise Hatem, Demi Leafar Girot
The 2023 US 50-State National Seismic Hazard Model: Overview and implications
The US National Seismic Hazard Model (NSHM) was updated in 2023 for all 50 states using new science on seismicity, fault ruptures, ground motions, and probabilistic techniques to produce a standard of practice for public policy and other engineering applications (defined for return periods greater than ∼475 or less than ∼10,000 years). Changes in 2023 time-independent seismic hazard...
Authors
Mark D. Petersen, Allison Shumway, Peter M. Powers, Ned Field, Morgan P. Moschetti, Kishor S. Jaiswal, Kevin R. Milner, Sanaz Rezaeian, Arthur Frankel, Andrea L. Llenos, Andrew J. Michael, Jason M. Altekruse, Sean Kamran Ahdi, Kyle Withers, Charles Mueller, Yuehua Zeng, Robert Edward Chase, Leah Marschall Salditch, Nico Luco, Kenneth S. Rukstales, Julie Herrick, Demi Leafar Girot, Brad T. Aagaard, Adrian M. Bender, Michael L. Blanpied, Richard W. Briggs, Oliver S. Boyd, Brandon Clayton, Christopher DuRoss, Eileen Evans, Peter J. Haeussler, Alexandra Elise Hatem, Kirstie Lafon Haynie, Elizabeth H. Hearn, Kaj M. Johnson, Zachary Alan Kortum, N. Simon Kwong, Andrew James Makdisi, Henry (Ben) Mason, Daniel McNamara, Devin McPhillips, Paul G. Okubo, Morgan T. Page, Frederick Pollitz, Justin L. Rubinstein, Bruce E. Shaw, Zheng-Kang Shen, Brian Shiro, James Andrew Smith, William J. Stephenson, Eric M. Thompson, Jessica Ann Thompson Jobe, Erin Wirth, Robert Witter
The USGS 2023 Conterminous U.S. time‐independent earthquake rupture forecast
We present the 2023 U.S. Geological Survey time‐independent earthquake rupture forecast for the conterminous United States, which gives authoritative estimates of the magnitude, location, and time‐averaged frequency of potentially damaging earthquakes throughout the region. In addition to updating virtually all model components, a major focus has been to provide a better representation...
Authors
Ned Field, Kevin R. Milner, Alexandra Elise Hatem, Peter M. Powers, Frederick Pollitz, Andrea L. Llenos, Yuehua Zeng, Kaj M. Johnson, Bruce E. Shaw, Devin McPhillips, Jessica Ann Thompson Jobe, Allison Shumway, Andrew J. Michael, Zheng-Kang Shen, Eileen Evans, Elizabeth H. Hearn, Charles Mueller, Arthur Frankel, Mark D. Petersen, Christopher DuRoss, Richard W. Briggs, Morgan T. Page, Justin L. Rubinstein, Julie Herrick
A probabilistic framework to model distributions of VS30
The time‐averaged shear‐wave velocity in the upper 30 m depth from the ground surface, or VS30, is often used as a predictor to describe local site effects in ground‐motion models. Although VS30 is typically determined from in situ measurements, it is not always feasible to obtain such measurements due to project restrictions or site accessibility. This motivates the development and use...
Authors
Utkarsh Mital, Sean Kamran Ahdi, Julie Herrick, Junko Iwahashi, Alexandros Savvaidis, Alan K. Yong
VS30 and Dominant Site Frequency (fd) as Provisional Station ML Corrections (dML) in California
New seismic stations added to a regional seismic network cannot be used to calculate local magnitude (ML) until a revised regionwide amplitude decay function is developed. Each station must record a minimum number of local and regional earthquakes that meet specific amplitude requirements prior to recalibration of the amplitude decay function. Station component adjustments (dML...
Authors
Alan K. Yong, Elizabeth S. Cochran, Jennifer R Andrews, Kenneth Hudson, Ellen Yu, Antony J. Martin, Julie Herrick, Jessica Dozal
Divisions of geologic time—Major chronostratigraphic and geochronologic units
IntroductionEffective communication in the geosciences requires a consistent nomenclature for stratigraphic units and, especially, for divisions of geologic time. A geologic time scale is composed of standard stratigraphic divisions based on rock sequences and is calibrated in years.Geologists from the U.S. Geological Survey (USGS), State geological surveys, academia, and other...
Authors
2012 volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory
The Alaska Volcano Observatory (AVO) responded to eruptions, possible eruptions, volcanic unrest, or suspected unrest at 11 volcanic centers in Alaska during 2012. Of the two verified eruptions, one (Cleveland) was clearly magmatic and the other (Kanaga) was most likely a single phreatic explosion. Two other volcanoes had notable seismic swarms that probably were caused by magmatic...
Authors
Julie Herrick, Christina A. Neal, Cheryl E. Cameron, James P. Dixon, Robert G. McGimsey
2010 Volcanic activity in Alaska, Kamchatka, and the Kurile Islands: Summary of events and response of the Alaska Volcano Observatory
The Alaska Volcano Observatory (AVO) responded to eruptions, possible eruptions, volcanic unrest or suspected unrest at 12 volcanic centers in Alaska during 2010. The most notable volcanic activity consisted of intermittent ash emissions from long-active Cleveland volcano in the Aleutian Islands. AVO staff also participated in hazard communication regarding eruptions or unrest at seven...
Authors
Christina A. Neal, Julie Herrick, Olga A. Girina, Marina Chibisova, Alexander Rybin, Robert G. McGimsey, Jim Dixon
Non-USGS Publications**
Herrick, J.A, Siebert, L., and Rose, W.I., 2013, Large-volume Barriles and Caisán debris avalanche deposits from Volcán Barú, Panama, in: Rose, W.I., Palma, J.L., Granados, H.D., and Varley, N., eds. Understanding open-vent volcanism and related hazards, GSA Special Publication 498, p. 141–162, https://doi.org/10.1130/2013.2498(09).
Global Volcanism Program, 2011. Report on Arenal (Costa Rica) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201104-345033
Global Volcanism Program, 2011. Report on Irazu (Costa Rica) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201104-345060
Global Volcanism Program, 2011. Report on Merapi (Indonesia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201105-263250
Global Volcanism Program, 2011. Report on Galeras (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201105-351080
Global Volcanism Program, 2011. Report on Fuego (Guatemala) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:6. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201106-342090
Global Volcanism Program, 2011. Report on Suwanosejima (Japan) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201107-282030
Global Volcanism Program, 2011. Report on Kirishimayama (Japan) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201107-282090
Global Volcanism Program, 2011. Report on Aira (Japan) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201110-282080
Global Volcanism Program, 2011. Report on Concepcion (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201110-344120
Global Volcanism Program, 2011. Report on Telica (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:11. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201111-344040
Global Volcanism Program, 2011. Report on San Cristobal (Nicaragua) (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 36:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201112-344020
Global Volcanism Program, 2012. Report on Cerro Negro (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201201-344070
Global Volcanism Program, 2012. Report on Momotombo (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201202-344090
Global Volcanism Program, 2012. Report on Mombacho (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201202-344110
Global Volcanism Program, 2012. Report on Maderas (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201203-344130
Global Volcanism Program, 2012. Report on Masaya (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201204-344100
Global Volcanism Program, 2012. Report on Galeras (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201204-351080
Global Volcanism Program, 2012. Report on Popocatepetl (Mexico) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201205-341090
Global Volcanism Program, 2012. Report on Masaya (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:6. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201206-344100
Global Volcanism Program, 2012. Report on Nevado del Ruiz (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201207-351020
Global Volcanism Program, 2012. Report on Nevado del Ruiz (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201208-351020
Global Volcanism Program, 2012. Report on San Cristobal (Nicaragua) (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201208-344020
Global Volcanism Program, 2012. Report on Sotara (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201209-351061
Global Volcanism Program, 2012. Report on Purace (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201209-351060
Global Volcanism Program, 2012. Report on Popocatepetl (Mexico) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201209-341090
Global Volcanism Program, 2012. Report on Nevado del Huila (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201210-351050
Global Volcanism Program, 2012. Report on Machin (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:11. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201211-351040
Global Volcanism Program, 2012. Report on Pagan (United States) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 37:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201212-284170
Global Volcanism Program, 2013. Report on Nevado del Huila (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201301-351050
Global Volcanism Program, 2013. Report on San Cristobal (Nicaragua) (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201301-344020
Global Volcanism Program, 2013. Report on Dona Juana (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201301-351070
Global Volcanism Program, 2013. Report on Cumbal (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201302-351100
Global Volcanism Program, 2013. Report on Galeras (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201303-351080
Global Volcanism Program, 2013. Report on Azufral (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201303-351090
Global Volcanism Program, 2013. Report on Kizimen (Russia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201304-300230
Global Volcanism Program, 2013. Report on Fuego (Guatemala) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201305-342090
Global Volcanism Program, 2013. Report on Cerro Bravo (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:6. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201306-351012
Global Volcanism Program, 2013. Report on Nevado del Tolima (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:6. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201306-351030
Global Volcanism Program, 2013. Report on Sangay (Ecuador) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201307-352090
Global Volcanism Program, 2013. Report on Chaiten (Chile) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201308-358041
Global Volcanism Program, 2013. Report on Puyehue-Cordon Caulle (Chile) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201309-357150
Global Volcanism Program, 2013. Report on Copahue (Chile-Argentina) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201309-357090
Global Volcanism Program, 2013. Report on Apoyeque (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201310-344091
Global Volcanism Program, 2013. Report on Cerro Negro (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201310-344070
Global Volcanism Program, 2013. Report on Cleveland (United States) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201310-311240
Global Volcanism Program, 2013. Report on Planchon-Peteroa (Chile) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:11. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201311-357040
Global Volcanism Program, 2013. Report on Mauna Kea (United States) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 38:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201312-332030
Global Volcanism Program, 2014. Report on Galeras (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201401-351080
Global Volcanism Program, 2014. Report on Telica (Nicaragua) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201402-344040
Global Volcanism Program, 2014. Report on Santa Maria (Guatemala) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201403-342030
Global Volcanism Program, 2014. Report on Fuego (Guatemala) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201404-342090
Global Volcanism Program, 2014. Report on Kilauea (United States) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201405-332010
Global Volcanism Program, 2014. Report on Kusatsu-Shiranesan (Japan) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:6. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201406-283120
Global Volcanism Program, 2014. Report on Nevado del Ruiz (Colombia) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201407-351020
Global Volcanism Program, 2014. Report on Kikai (Japan) (Herrick, J.A., and Wunderman, R., eds.). Bulletin of the Global Volcanism Network, 39:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201407-282060
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
2025 PRVI NSHM Update & Beyond Workshop
The National Seismic Hazard Model Project (NSHMP) will be presenting preliminary results of the 2025 Puerto Rico and U.S. Virgin Islands NSHM Update at this public workshop. On Day 1 we will focus on the 2025 PRVI update and on Day 2 we will present current data collection activities. These presentations will be technical but we encourage participation from users and stakeholders.
2023 50-State NSHM Update Workshop
The National Seismic Hazard Model Project (NSHMP) will be presenting final results of the 2023 50-State NSHM Update at this public workshop.
Earthquake geology inputs for the National Seismic Hazard Model (NSHM) 2025 (Puerto Rico and U.S. Virgin Islands), version 1.0
This Data Release contains preliminary versions of three related geologic input databases for the Puerto Rico and U.S. Virgin Islands (PRVI) region (62°–70° W and 16°–21° N) of the United States: 1) A fault sections database (“NSHM2025_FaultSections_PRVI_v1’”), which depicts the geometry of faults capable of hosting independent earthquakes, 2) a fault-zone polygon database ("NSHM2025...
Data Release for the 2023 U.S. 50-State National Seismic Hazard Model - Overview
This data release contains data sets associated with the 2023 50-State National Seismic Hazard Model Update. The 2023 50-State National Seimsic Hazard Model (NSHM) Update includes an update to the NSHMs for the conterminous U.S (CONUS, last updated in 2018), Alaska (AK, last updated in 2007), and Hawaii (last updated in 2001). Data sets include inputs like seismicity catalogs used as...
Data Release - Geologic map of the central Upper Peninsula, Michigan
This dataset supports the publication "Geophysical insights into Paleoproterozoic tectonics along the southern margin of the Superior Province, central Upper Peninsula, Michigan, USA." At a 1:100,000 scale, these data are in a geologic database in the Geologic Map Schema (GeMS) which includes spatial feature classes and non-spatial tables that contain the geologic information presented...
Updated Compilation of VS30 Data for the United States
VS30, the time-averaged shear-wave velocity (VS) to a depth of 30 meters, is a key index adopted by the earthquake engineering community to account for seismic site conditions. VS30 is typically based on geophysical measurements of VS derived from invasive and noninvasive techniques at sites of interest. Owing to cost considerations, as well as logistical and environmental concerns, VS30...
Where Do Earthquakes Occur?
Social media graphic used for promoting the 2023 update to the National Seismic Hazard Model | U.S. Geological Survey (usgs.gov)
Social media graphic used for promoting the 2023 update to the National Seismic Hazard Model | U.S. Geological Survey (usgs.gov)