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Filter Total Items: 4,147
Year Published: 2017

Processing and review interface for strong motion data (PRISM) software, version 1.0.0—Methodology and automated processing

A continually increasing number of high-quality digital strong-motion records from stations of the National Strong-Motion Project (NSMP) of the U.S. Geological Survey (USGS), as well as data from regional seismic networks within the United States, call for automated processing of strong-motion records with human review limited to selected...

Jones, Jeanne; Kalkan, Erol; Stephens, Christopher
Jones, J., Kalkan, E., and Stephens, C., 2017, Processing and review interface for strong motion data (PRISM) software, version 1.0.0—Methodology and automated processing: U.S. Geological Survey Open-File Report 2017–1008, 81 p., https://doi.org/10.3133/ofr20171008.

Year Published: 2017

Systematic comparisons between PRISM version 1.0.0, BAP, and CSMIP ground-motion processing

A series of benchmark tests was run by comparing results of the Processing and Review Interface for Strong Motion data (PRISM) software version 1.0.0 to Basic Strong-Motion Accelerogram Processing Software (BAP; Converse and Brady, 1992), and to California Strong Motion Instrumentation Program (CSMIP) processing (Shakal and others, 2003, 2004)....

Kalkan, Erol; Stephens, Christopher
Kalkan, E., and Stephens, C., 2017, Systematic comparisons between PRISM version 1.0.0, BAP, and CSMIP ground-motion processing: U.S. Geological Survey Open-File Report 2017–1020, 108 p., https://doi.org/10.3133/ofr20171020.

Year Published: 2017

Landslide kinematics and their potential controls from hourly to decadal timescales: Insights from integrating ground-based InSAR measurements with structural maps and long-term monitoring data

Knowledge of kinematics is rudimentary for understanding landslide controls and is increasingly valuable with greater spatiotemporal coverage. However, characterizing landslide-wide kinematics is rare, especially at broadly ranging timescales. We used highly detailed kinematic data obtained using photogrammetry and field mapping during the 1980s...

Schulz, William; Coe, Jeffrey A.; Ricci, P.P; Smoczyk, Gregory M.; Shurtleff, Brett L; Panosky, J
Schulz W.H., Coe J.A., Ricci P.P., Smoczyk G.M., Shurtleff B.L., Panosky J. Landslide kinematics and their potential controls from hourly to decadal timescales: Insights from integrating ground-based InSAR measurements with structural maps and long-term monitoring data Geomorphology 285 (2017) 121–136, doi:10.1016/j.geomorph.2017.02.011

Year Published: 2017

Gravitational body forces focus North American intraplate earthquakes

Earthquakes far from tectonic plate boundaries generally exploit ancient faults, but not all intraplate faults are equally active. The North American Great Plains exemplify such intraplate earthquake localization, with both natural and induced seismicity generally clustered in discrete zones. Here we use seismic velocity, gravity and topography to...

Levandowski, William Brower; Zellman, Mark; Briggs, Richard
Levandowski, W., Zellman, M., and Briggs, R., 2017, Gravitational body forces focus North American intraplate earthquakes: Nature Communications, v. 8, p. 14314

Year Published: 2017

Lithospheric density structure beneath the Tarim basin and surroundings, northwestern China, from the joint inversion of gravity and topography

Intraplate strain generally focuses in discrete zones, but despite the profound impact of this partitioning on global tectonics, geodynamics, and seismic hazard, the processes by which deformation becomes localized are not well understood. Such heterogeneous intraplate strain is exemplified in central Asia, where the Indo-Eurasian collision has...

Deng, Yangfan; Levandowski, William Brower; Kusky, Tim
Deng, Y., Levandowski, W., and Kusky, T. (2017) Lithospheric density structure beneath the Tarim basin and surroundings, northwestern China, from the joint inversion of gravity and topography. Earth and Planetary Science Letters, 260, 244-254.

Year Published: 2017

Source modeling of the 2015 Mw 7.8 Nepal (Gorkha) earthquake sequence: Implications for geodynamics and earthquake hazards

The Gorkha earthquake on April 25th, 2015 was a long anticipated, low-angle thrust-faulting event on the shallow décollement between the India and Eurasia plates. We present a detailed multiple-event hypocenter relocation analysis of the Mw 7.8 Gorkha Nepal earthquake sequence, constrained by local seismic stations, and a geodetic rupture model...

McNamara, Daniel E.; Yeck, William; Barnhart, William D.; Schulte-Pelkum, V.; Bergman, E.; Adhikari, L. B.; Dixit, Amod; Hough, S.E.; Benz, Harley M.; Earle, Paul

Year Published: 2017

Chemistry of diagenetic features analyzed by ChemCam at Pahrump Hills, Gale crater, Mars

The Curiosity rover's campaign at Pahrump Hills provides the first analyses of lower Mount Sharp strata. Here we report ChemCam elemental composition of a diverse assemblage of post-depositional features embedded in, or cross-cutting, the host rock. ChemCam results demonstrate their compositional diversity, especially compared to the surrounding...

Nachon, Marion; Mangold, Nicolas; Forni, Olivier; Kah, Linda C.; Cousin, Agnes; Wiens, Roger C.; Anderson, Ryan; Blaney, Diana L.; Blank, Jen G.; Calef, Fred J.; Clegg, Samuel M.; Fabre, Cecile; Fisk, Martin R.; Gasnault, Olivier; Grotzinger, John P.; Kronyak, Rachel; Lanza, Nina L.; Lasue, Jeremie; Le Deit, Laetitia; Le Mouelic, Stephane; Maurice, Sylvestre; Meslin, Pierre-Yves; Oehler, D. Z.; Payre, Valerie; Rapin, William; Schroder, Susanne; Stack, Katherine M.; Sumner, Dawn
Nachon, M., Mangold, N., Forni, O., Kah, L.C., Cousin, A., Wiens, R.C., Anderson, R., Blaney, D., Blank, J.G., Calef, F., Clegg, S.M., Fabre, C., Fisk, M.R., Gasnault, O., Grotzinger, J.P., Kronyak, R., Lanza, N.L., Lasue, J., Deit, L.L., Mouélic, S.L., Maurice, S., Meslin, P.-Y., Oehler, D.Z., Payré, V., Rapin, W., Schröder, S., Stack, K., Sumner, D., 2017. Chemistry of diagenetic features analyzed by ChemCam at Pahrump Hills, Gale crater, Mars. Icarus 281, 121–136. doi:10.1016/j.icarus.2016.08.026

Year Published: 2017

Improved accuracy in quantitative laser-induced breakdown spectroscopy using sub-models

Accurate quantitative analysis of diverse geologic materials is one of the primary challenges faced by the Laser-Induced Breakdown Spectroscopy (LIBS)-based ChemCam instrument on the Mars Science Laboratory (MSL) rover. The SuperCam instrument on the Mars 2020 rover, as well as other LIBS instruments developed for geochemical analysis on Earth or...

Anderson, Ryan; Clegg, Samuel M.; Frydenvang, Jens; Wiens, Roger C.; McLennan, Scott M.; Morris, Richard V.; Ehlmann, Bethany L.; Dyar, M. Darby
Clegg, S.M., Wiens, R.C., Anderson, R., Forni, O., Frydenvang, J., Lasue, J., Cousin, A., Payré, V., Boucher, T., Dyar, M.D., McLennan, S.M., Morris, R.V., Graff, T.G., Mertzman, S.A., Ehlmann, B.L., Belgacem, I., Newsom, H., Clark, B.C., Melikechi, N., Mezzacappa, A., McInroy, R.E., Martinez, R., Gasda, P., Gasnault, O., Maurice, S., 2017. Recalibration of the Mars Science Laboratory ChemCam instrument with an expanded geochemical database. Spectrochimica Acta Part B: Atomic Spectroscopy 129, 64–85. doi:10.1016/j.sab.2016.12.003

Year Published: 2017

Electrical resistivity investigation of fluvial geomorphology to evaluate potential seepage conduits to agricultural lands along the San Joaquin River, Merced County, California, 2012–13

Increased flows in the San Joaquin River, part of the San Joaquin River Restoration Program, are designed to help restore fish populations. However, increased seepage losses could result from these higher restoration flows, which could exacerbate existing drainage problems in neighboring agricultural lands and potentially damage crops. Channel...

Groover, Krishangi D.; Burgess, Matthew K.; Howle, James F.; Phillips, Steven P.
Groover, K.D., Burgess, M.K., Howle, J.F., Philips, S.P., 2017, Electrical resistivity investigation of fluvial geomorphology to evaluate potential seepage conduits to agricultural lands along the San Joaquin River, Merced County, California, 2012–13: U.S. Geological Survey Scientific Investigations Report 2016–5172, 39 p., https://doi.org/10.3133/sir20165172.

Year Published: 2017

Adjusting central and eastern North America ground‐motion intensity measures between sites with different reference‐rock site conditions

Adjustment factors are provided for converting ground‐motion intensity measures between central and eastern North America (CENA) sites with different reference‐rock site conditions (VS30=760, 2000, and 3000  m/s) for moment magnitudes ranging from 2 to 8, rupture distances ranging from 2 to 1200 km, Fourier amplitude spectra (FAS) for...

Boore, David; Campbell, Kenneth W.
Boore, D. M. and K. W. Campbell (2017). Adjusting central and eastern North America ground-motion intensity measures between sites with different reference-rock site conditions, Bull. Seismol. Soc. Am. 107, 132—148.

Year Published: 2017

Compartmentalization of the Coso East Flank geothermal field imaged by 3-D full-tensor MT inversion

Previous magnetotelluric (MT) studies of the high-temperature Coso geothermal system in California identified a subvertical feature of low resistivity (2–5 Ohm m) and appreciable lateral extent (>1 km) in the producing zone of the East Flank field. However, these models could not reproduce gross 3-D effects in the recorded data. We...

Lindsey, Nathaniel J.; Kaven, Joern; Davatzes, Nicholas C.; Newman, Gregory A.
Lindsey N.J., Kaven J.O., Davatzes N., Newman G.A. Compartmentalization of the Coso East Flank geothermal field imaged by 3-D full-tensor MT inversion Geophys J Int (2017) 208 (2): 652-662.

Year Published: 2017

Development and utilization of USGS ShakeCast for rapid post-earthquake assessment of critical facilities and infrastructure

The ShakeCast system is an openly available, near real-time post-earthquake information management system. ShakeCast is widely used by public and private emergency planners and responders, lifeline utility operators and transportation engineers to automatically receive and process ShakeMap products for situational awareness, inspection priority,...

Wald, David J.; Lin, Kuo-wan; Kircher, C.A.; Jaiswal, Kishor; Luco, Nicolas; Turner, L.; Slosky, Daniel

Filter Total Items: 2,354
A scientist looking at lava flow
June 2, 2018

Kīlauea Volcano — Documenting Flows

An HVO geologist documents the fissure 8 flow southeast of Four Corners (the intersection of Highways 132 and 137).

lava flow on road way
June 2, 2018

Kīlauea Volcano — `A`ā Flow

East side of the fissure 8 flow on the "lighthouse road" (east of the Four Corners intersection). The ‘a‘ā flow was about 5 m (16 ft) thick when this photo was taken around 2:00 p.m. HST. 

Plume from lava flow
June 2, 2018

Kīlauea Volcano — Lava Flowing into Green Lake

As fissure 8 lava flowed into Green Lake, the lake water boiled away, sending a white 

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Aerial of lava flow
June 2, 2018

Kīlauea Volcano — Overflight of Fissure 8 Advancement

USGS scientists on HVO's overflight this morning (June 2) captured this image of the 

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Aerial photo of vog
June 1, 2018

Kīlauea Volcano — Fissure 8 Lava Flow

Fissure 8 continues to feed lava into multiple flow lobes. One lobe is advancing through agricultural lands toward the northeast, as shown in this image taken from a helicopter overflight on June 1, 2018, at 6:21 AM.

June 1, 2018

Kīlauea Volcano — Caldera Changes (May 23 - 31)

This animated GIF shows a pair of radar amplitude images that were acquired by the Italian Space Agency's Cosmo-SkyMed satellite system. The images illustrate changes to the 

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June 1, 2018

USGS Status Update of Kīlauea Volcano - June 1, 2018

USGS Hawaiian Volcano Observatory
Status of Kīlauea Volcano
June 1, 2018 
Jessica Ball, USGS Volcanologist

View of fissure 8 fountaining
June 1, 2018

Kīlauea Volcano — Fissure 8

Viewed from the intersection of Nohea and Leilani Streets at 10:15AM HST on June 1, the Fissure 8 

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May 31, 2018

Jersey Shore Field Work

Deployment of an Edgetech 512i subbottom profiler from the deck of Stockton University's R/V Petrel near Little Egg Inlet, NJ. The USGS Coastal and Marine Geology Program is working to characterize the sea floor and shallow substrate in nearshore waters, using high-resolution geophysical techniques, sediment sampling, and sea-floor photography and videography.
 

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May 31, 2018

Kīlauea Volcano — Halema‘uma‘u Crater Changes

A UAS mission on May 31, 2018, filmed details of the dramatic changes occurring within Halema‘uma‘u crater at Kīlauea's summit since explosive eruptions of 

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Pele's Hair
May 31, 2018

Pele's Hair

This long thin, strand of volcanic glass is called Pele's hair. Named for Pele, the Hawaiian goddess of fire, Pele's hair is formed from lava fountains and rapidly moving lava flows. This strand of Pele’s hair was found on Kupono Street in Leilani Estates, Hawaii, during the Kīlauea volcano eruption.

Filter Total Items: 367
Date published: December 21, 2015

Normal Weather Drives Salt Marsh Erosion

For salt marshes, hurricanes are just another day at the beach.

Attribution: Natural Hazards
Date published: December 4, 2015

Low-flying Airplane Mapping Geology and Mineral Resources Over the Eastern Adirondacks

Residents of Essex and Clinton counties in New York may notice an airplane flying a grid pattern at low altitude for a few weeks in December as scientists from the U.S. Geological Survey map buried geological features that provide clues into mineral resources in the area.

Date published: October 29, 2015

3D Images of Magma Below Mono Craters Area

A new conceptual model of the magma system below Mono Lake and Mono Craters in eastern California gives scientists a more detailed understanding of volcanic processes at depth, and a better model for forecasting volcanic unrest.

Attribution: Natural Hazards
Date published: October 26, 2015

A Century of Induced Earthquakes in Oklahoma?

The rate of earthquakes has increased sharply since 2009 in the central and eastern United States, with growing evidence confirming that these earthquakes are primarily caused by human activity, namely the injection of wastewater in deep disposal wells.

Attribution: Natural Hazards
Date published: October 22, 2015

Floods in South Carolina Set 17 USGS Streamgage Records

During the historic October 2015 floods in South Carolina, 17 U.S. Geological Survey streamgages recorded the highest peak streamflow and/or river height (or stage) since those streamgages were installed. An additional 15 USGS streamgages recorded peaks in the top 5 for their periods of record.

Attribution: Natural Hazards
Date published: October 22, 2015

Joint Venture, U.S. Geological Survey Join Forces

Joint Venture Silicon Valley and the U.S. Geological Survey today jointly announced a partnership to address regional challenges from natural hazards, climate and land use change, and continued availability of clean air and water resources.

Date published: October 15, 2015

Critical Volcano Monitoring Systems Returned to Operation in Alaska

The Alaska Volcano Observatory has recently completed repairs to seismic monitoring equipment on Aniakchak Volcano on the Alaska Peninsula that have restored ground-based monitoring at the volcano.

Date published: October 14, 2015

Media Advisory and Photo Op: USGS Employees Get Ready to “Drop, Cover, and Hold On!” in the Great ShakeOut

MENLO PARK, Calif. — U.S. Geological Survey employees in Menlo Park, Calif. will participate in an earthquake safety drill, and test their emergency response plan as part of the Great ShakeOut on Oct. 15, an annual day of action to practice how to protect yourself from an earthquake.

Date published: October 5, 2015

EarthWord: Fumarole

Fumaroles are openings in the earth’s surface that emit steam and volcanic gases, such as sulfur dioxide and carbon dioxide. They can occur as holes, cracks, or fissures near active volcanoes or in areas where magma has risen into the earth’s crust without erupting. A fumarole can vent for centuries or quickly go extinct, depending on the longevity of its heat source.

Date published: October 2, 2015

Atlantic Beaches Still Likely to be Affected by Hurricane Joaquin

As the path of Hurricane Joaquin continues to move farther offshore, making landfall in the U.S. less likely, U.S. Geological Survey coastal change experts say there’s still a high probability of dune erosion along parts of the Atlantic coast, from the North Carolina Outer Banks to Cape Cod.

Date published: October 1, 2015

Media Advisory: USGS Deploys Crews in Advance of Hurricane Joaquin in Virginia

USGS field crews will be out deploying storm tide sensors along the Virginia coast near Virginia Beach, along the Western Chesapeake Bay, and on the Eastern Shore ahead of Hurricane Joaquin. Storm tide sensors measure the tidal fluctuations and height of the tide relative to land surface.

Date published: September 30, 2015

Aurora Borealis Painting Pays Tribute to Civil War’s End

USGS explores the meaning behind Frederic Edwin Church's 1865 painting, “Aurora Borealis.”