Earthquake Hazards Program

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Filter Total Items: 2,118
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Year Published: 2020

Documentation of Surface Fault Rupture and Ground‐Deformation Features Produced by the 4 and 5 July 2019 Mw 6.4 and Mw 7.1 Ridgecrest Earthquake Sequence

The Mw">MwMw 6.4 and Mw">MwMw 7.1 Ridgecrest earthquake sequence occurred on 4 and 5 July 2019 within the eastern California shear zone of southern California. Both events produced extensive surface faulting and ground deformation within Indian Wells Valley and Searles Valley. In the weeks following the earthquakes, more...

Ponti, Daniel J.; Blair, James Luke; Rosa Carla M; Thomas, Kate; Pickering, Alexandra; Akciz, Sinan; Angster, Stephen J.; Avouac, Jean-Philipe; Bachhuber, Jeffrey; Bacon, Steven; Barth, Nicolas C.; Bennett, S.; Blake, Kelly; Bork, Stephan; Brooks, Benjamin A.; Bullard, Thomas; Burgess, Paul A.; Chupik, Colin; Dawson, Timothy E.; DeFrisco, Michael; Delano, Jaime E.; DeLong, Stephen B.; Dolan, James D.; Donnellan, Andrea; Duross, Christopher; Ericksen, Todd; Frost, Erik; Funning, Gareth J.; Gold, Ryan D.; Graehl, Nicholas A; Gutierrez, Carlos; Haddon, Elizabeth; Hatem, Alexandra Elise; Helms, John; Hernandez, Janis; Hitchcock, Christopher S.; Holland, Peter; Hudnut, Kenneth W.; Kendrick, Katherine; Koehler, Richard D; Kozaci, Ozgur; Ladinsky, Tyler C.; Leeper, Robert; Madugo, Christopher; Mareschal, Maxime; McDonald, James; McPhillips, Devin; Milliner, Christopher; Mongovin, Daniel; Morelan, Alexander; Nale, Stephanie; Nevitt, Johanna; O'Neal, Matt; Olsen, Brian J.; Oskin, Michael; Padilla, Salena; Patton, Jason; Philibosian, Belle; Pierce, Ian; Pridmore, Cynthia; Roth, Nathaniel; Sandwell, David ; Scharer, Katherine; Seitz, Gordon G.; Singleton, Drake; Smith-Konter, Bridget; Spangler, Eleanor; Swanson, Brian J.; Jobe, Jessica Thompson; Treiman, Jerome; Valencia, Francesca; Vanderwal, Joshua; Williams, Alana; Xu, Xiaohua; Zachariasen, Judith; Zimmerman, Jade; Zinke, Robert

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Year Published: 2020

Recording the aurora borealis (northern lights) at seismometers across Alaska

We examine three continuously recording data sets related to the aurora: all‐sky camera images, three‐component magnetometer data, and vertical‐component, broadband seismic data as part of the EarthScope project (2014 to present). Across Alaska there are six all‐sky cameras, 13 magnetometers, and >200">>200>200 ...

Tape, C.; Ringler, Adam T.; Hampton, D.L.

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Year Published: 2020

Citizen science collaboration with the U.S. Geological Survey in Alaska

Citizen science is science undertaken by the public, usually in collaboration with professional scientific institutions. It encourages citizens to tackle real-world scientific problems and augments traditional science by expanding the coverage of data collection and by reducing costs of fieldwork in remote locations. Information collected by...

Powers, Elizabeth; Williams, Dee
Powers, E.M., and Williams, D.M., 2020, Citizen science collaboration with the U.S. Geological Survey in Alaska: U.S. Geological Survey Fact Sheet 2020-3026, 2 p., https://doi.org/10.3133/fs20203026.

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Year Published: 2020

Global quieting of high-frequency seismic noise due to COVID-19 pandemic lockdown measures

Human activity causes vibrations that propagate into the ground as high-frequency seismic waves. Measures to mitigate the COVID-19 pandemic caused widespread changes in human activity, leading to a months-long reduction in seismic noise of up to 50%. The 2020 seismic noise quiet period is the longest and most prominent global anthropogenic seismic...

Lecocq, Thomas; Hicks, Stephen; Van Noten, Koen; van Wijk, Kasper; Koelemeijer, Paula; De Plaen, Raphael S.M.; Massin, Frederick; Hillers, Gregor; Anthony, Robert E.; Apoloner, Maria-Theresia; Arroyo-Solorzano, Mario; Assink, Jelle D.; Buyukakpinar, Pinar; Cannata, Andrea; Cannavo, Flavio; Carrasco, Sebastian; Caudron, Corentin; Chaves, Esteban J.; Cornwell, David G.; Craig, David; den Ouden, Oliver F.C.; Diaz, Jordi; Donner, Stefanie; Evangelidis, Christos P.; Evers, Laslo; Fauville, Benoit; Fernandez, Gonzalo A.; Giannopoulos, Dimitrios; Gibbons, Steven J.; Girona, Tarsilo; Grecu, Bogdan; Grunberg, Marc; Hetenyi, Gyorgy; Horleston, Anna; Inza, Adolfo; Irving, Jessica C.E.; Jamalreyhani, Mohammadreza; Kafka, Alan; Koymans, Mathijs R.; Labedz, Celeste; Larose, Eric; Lindsey, Nathaniel J.; McKinnon, Mika; Megies, Tobias; Miller, Meghan S.; Minarik, William G.; Moresi, Louis; Marquez-Ramirez, Victor H.; Mollhoff, Martin; Nesbitt, Ian; Niyogi, Shankho; Ojeda, Javier; Oth, Adrien; Proud, Simon; Pulli, Jay; Retailleau, Lise; Rintamaki, Annukka E.; Satriano, Claudio; Savage, Martha K.; Shani-Kamiel, Shanhar; Sleeman, Reinoud; Sokos, Efthimios; Stammler, Klaus; Stott, Alexander E.; Subedi, Shiba; Sorensen, Mathilde B.; Taira, Taka'aki; Tapia, Mar; Turhan, Faith; van der Pluijm, Ben; Vanstone, Mark; Vernge, Jerome; Vuorinen, Tommi A.T.; Warren, Tristram; Wassermann, Joachim; Xiao, Han

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Year Published: 2020

Pseudo-prospective evaluation of UCERF3-ETAS forecasts during the 2019 Ridgecrest sequence

The 2019 Ridgecrest sequence provides the first opportunity to evaluate Uniform California Earthquake Rupture Forecast v.3 with epidemic‐type aftershock sequences (UCERF3‐ETAS) in a pseudoprospective sense. For comparison, we include a version of the model without explicit faults more closely mimicking traditional ETAS models (UCERF3‐NoFaults). We...

Savran, William J.; Werner, Maximillian J.; Marzocchi, W.; Rhoades, David A.; Jackson, David D.; Milner, Kevin R.; Field, Edward H.; Michael, Andrew J.

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Year Published: 2020

Evidence of previous faulting along the 2019 Ridgecrest, California earthquake ruptures

The July 2019 Ridgecrest earthquake sequence in southeastern California was characterized as surprising because only ~35% of the rupture occurred on previously mapped faults. Employing more detailed inspection of pre-event high-resolution topography and imagery in combination with field observations, we document evidence of active faulting in the...

Thompson Jobe, Jessica; Philibosian, Belle; Chupik, Colin; Dawson, Timothy E.; Bennett, Scott E. K.; Gold, Ryan D.; Duross, Christopher; Ladinsky, Tyler C.; Kendrick, Katherine; Haddon, Elizabeth; Pierce, Ian; Swanson, Brian J.; Seitz, Gordon G.

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Year Published: 2020

Factors influencing the probability of hydraulic fracturing induced seismicity in Oklahoma

Injection‐induced seismicity became an important issue over the past decade, and although much of the rise in seismicity is attributed to wastewater disposal, a growing number of cases have identified hydraulic fracturing (HF) as the cause. A recent study identified regions in Oklahoma where ≥75% of seismicity from 2010 to 2016 correlated...

Ries, Rosamiel; Brudzinski, Michael R.; Skoumal, Robert; Currie, Brian S.

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Year Published: 2020

ShakeAlert Earthquake Early Warning System Performance During the 2019 Ridgecrest Earthquake Sequence

During July 2019, a sequence of earthquakes including a Mw6.4 foreshock and a Mw7.1 mainshock occurred near Ridgecrest, California. ShakeAlert, the U.S. Geological Survey (USGS) ShakeAlert public Earthquake Early Warning (EEW) system being developed for the U.S. West Coast, was operational during this time, though public alerting was only...

Chung, Angela; Meier, Men-Andrin; Andrews, Jennifer; Böse, Maren; Crowell, Brendan; McGuire, Jeffrey; Smith, Deborah

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Year Published: 2020

Towards understanding relationships between atmospheric pressure variations and long-period horizontal seismic data: A case study

Variations in atmospheric pressure have long been known to introduce noise in long-period (>10 s) seismic records. This noise can overwhelm signals of interest such as normal modes and surface waves. Generally, this noise is most pronounced on the horizontal components where it arises due to tilting of the seismometer in response to...

Alejandro, Alexis Casondra Bianca; Ringler, Adam T.; Wilson, David C.; Anthony, Robert E.; Moore, S.V.

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Year Published: 2020

New opportunities to study earthquake precursors

No abstract available. 

Pritchard, M. E.; Allen, R. M.; Becker, T. W.; Behn, M. D.; Brodsky, E. E.; Burgmann, R.; Ebinger, C.; Freymueller, J. T.; Gerstenberger, M. C.; Haines, B.; Kaneko, Y.; Jacobsen, S. D.; Lindsey, N.; McGuire, Jeffrey; Page, Morgan T.; Ruiz, S.; Tolstoy, M.; Wallace, L.; Walter, W. R.; Wilcock, W.; Vincent, H.

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Year Published: 2020

A maximum rupture model for the southern San Andreas and San Jacinto Faults California, derived from paleoseismic earthquake ages: Observations and limitations

Paleoseismic rupture histories provide spatiotemporal models of earthquake moment release needed to test numerical models and lengthen the instrumental catalog. We develop a model of the fewest and thus largest magnitude earthquakes permitted by paleoseismic data for the last 1,500 years on the southern San Andreas and San Jacinto Faults,...

Scharer, Katherine; Yule, Doug

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Year Published: 2020

Segmentation and supercycles: A catalog of earthquake rupture patterns from the Sumatran Sunda Megathrust and other well-studied faults worldwide

After more than 100 years of earthquake research, earthquake forecasting, which relies on knowledge of past fault rupture patterns, has become the foundation for societal defense against seismic natural disasters. A concept that has come into focus more recently is that rupture segmentation and cyclicity can be complex, and that a characteristic...

Philibosian, Belle; Meltzner, Aron J.