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Earthquakes pose significant risk to 75 million Americans in 39 States. We monitor and report earthquakes, assess earthquake impacts and hazards, and research the causes and effects of earthquakes. Our program is part of the larger, National Earthquake Hazards Reduction Program (NEHRP), a four-agency partnership established by Congress.
The Earthquake Hazards Program monitors and reports earthquakes, assesses earthquake impacts and hazards, and researches the causes and effects of earthquake.
A simple text format suitable for loading data into spreadsheet applications. This is a good option for manual scientific analysis.
A flexible, extensible and modular XML representation of seismological data which is intended to cover a broad range of fields of application in modern seismology.
This feed format is suitable for loading into applications that understand Keyhole Markup Language (KML) such as Google Earth™.
A well-structured format readily parsed by most programming languages. This is a good option for software developers wishing to use earthquake data.
A basic syndication format supported by a variety of feed readers. This is a good option for casually subscribing to earthquake information.
The Earthquake Notification Service (ENS) is a free service that sends you automated notifications to your email or cell phone when earthquakes happen.
View the most recent events or search for past earthquakes.
Tweet Earthquake Dispatch (TED) offers two Twitter accounts. On average, each account will produce about one tweet per day.
Feel an earthquake? Report it here. View reported earthquakes in your area.
Get real-time earthquake notifications sent to you using a number of popular mediums: Feeds, Email, Twitter, etc…
View recent events or search for past earthquakes. Optimized for mobile and desktop.
Effective stress, friction and deep crustal faulting
Studies of crustal faulting and rock friction invariably assume the effective normal stress that determines fault shear resistance during frictional sliding is the applied normal stress minus the pore pressure. Here we propose an expression for the effective stress coefficient αf at temperatures and stresses near the brittle-ductile transition (...Beeler, N.M.; Hirth, Greg; Thomas, Amanda M.; Burgmann, Roland
How to build and teach with QuakeCaster: an earthquake demonstration and exploration tool
QuakeCaster is an interactive, hands-on teaching model that simulates earthquakes and their interactions along a plate-boundary fault. QuakeCaster contains the minimum number of physical processes needed to demonstrate most observable earthquake features. A winch to steadily reel in a line simulates the steady plate tectonic motions far from the...Linton, Kelsey; Stein, Ross S.
Rapid earthquake characterization using MEMS accelerometers and volunteer hosts following the M 7.2 Darfield, New Zealand, EarthquakeLawrence, J. F.; Cochran, E.S.; Chung, A.; Kaiser, A.; Christensen, C. M.; Allen, R.; Baker, J.W.; Fry, B.; Heaton, T.; Kilb, Debi; Kohler, M.D.; Taufer, M.
Seismological analyses of the 2010 March 11, Pichilemu, Chile Mw 7.0 and Mw 6.9 coastal intraplate earthquakesRuiz, Javier A.; Hayes, Gavin P.; Carrizo, Daniel; Kanamori, Hiroo; Socquet, Anne; Comte, Diana
Logs and data from trenches across the Berryessa Fault at the Jerd Creek site, northeastern Napa County, California, 2011-2012Lienkaemper, James J.; Rosa, Carla M.; Cappelle, Ian J.; Wolf, Evan M.; Knepprath, Nichole E.; Piety, Lucille A.; Derouin, Sarah A.; Reidy, Liam M.; Redwine, Joanna L.; Sickler, Robert R.
Global surface displacement data for assessing variability of displacement at a point on a faultHecker, Suzanne; Sickler, Robert; Feigelson, Leah; Abrahamson, Norman; Hassett, Will; Rosa, Carla; Sanquini, Ann
Response of Global Navigation Satellite System receivers to known shaking between 0.2 and 20 Hertz
Over the past decade, several technological advances have allowed Global Navigation Satellite Systems (GNSS) receivers to have the capability to record displacements at high frequencies, with sampling rates approaching 100 samples per second (sps). In addition, communication and computer hardware and software have allowed various institutions,...Langbein, John; Evans, John R.; Blume, Fredrick; Johanson, Ingrid
Triggered aseismic slip adjacent to the 6 February 2013 Mw 8.0 Santa Cruz Islands megathrust earthquakeHayes, Gavin P.; Furlong, Kevin P.; Benz, Harley M.; Herman, Matthew W.
Quantifying potential earthquake and tsunami hazard in the Lesser Antilles subduction zone of the Caribbean regionHayes, Gavin P.; McNamara, Daniel E.; Seidman, Lily; Roger, Jean
Borehole-explosion and air-gun data acquired in the 2011 Salton Seismic Imaging Project (SSIP), southern California: description of the surveyRose, Elizabeth J.; Fuis, Gary S.; Stock, Joann M.; Hole, John A.; Kell, Annie M.; Kent, Graham; Driscoll, Neal W.; Goldman, Mark; Reusch, Angela M.; Han, Liang; Sickler, Robert R.; Catchings, Rufus D.; Rymer, Michael J.; Criley, Coyn J.; Scheirer, Daniel S.; Skinner, Steven M.; Slayday-Criley, Coye J.; Murphy, Janice M.; Jensen, Edward G.; McClearn, Robert; Ferguson, Alex J.; Butcher, Lesley A.; Gardner, Max A.; Emmons, Iain; Loughran, Caleb L.; Svitek, Joseph R.; Bastien, Patrick C.; Cotton, Joseph A.; Croker, David S.; Harding, Alistair J.; Babcock, Jeffrey M.; Harder, Steven H.; Rosa, Carla M.
Natural Hazards Science at the U.S. Geological SurveyPerry, Suzanne C.; Jones, Lucile M.; Holmes, Jr., Robert R.
Surface electric fields for North America during historical geomagnetic stormsWei, Lisa H.; Homeier, Nichole; Gannon, Jennifer L.
Interviews with staff at Point Reyes National Seashore tell how this National Park Service unit uses USGS science to educate visitors, and manage the park.
USGS Research Geophysicist Kate Allstadt conducts experiments at the U.S. Geological Survey debris-flow flume, near Eugene, Oregon. Dr. Allstadt and her group are working toward an understanding of how debris flows generate seismic signals. The quantitative information will be used in the development of improved technologies for detecting debris flows to mitigate their destructive effects.
Nearly 60 years after a magnitude 7.7 earthquake struck Lituya Bay, Alaska — leading to a tsunami that devastated the area — six U.S. Geological Survey geologists revisited the isolated region of Alaska, to pick up where their scientific predecessors left off. In this photo, members of the USGS research team pause to take in the view of South Crillon Glacier from a study site along the Fairweather Fault in southeast Alaska.
Trench site along the southern Fairweather Fault, in Glacier Bay National Park, Alaska. The alluvial fan at left consists of lake, stream channel and debris flow deposits impounded by the Fairweather Fault scarp, at right.
USGS research geologist Kate Scharer with her finger on the Fairweather Fault in southeast Alaska. The magnitude 7.8 Lituya Bay earthquake caused shaking that toppled trees along the fault, which left a break in the forest shown here.
Periodic calving of ice from the snout of South Crillon Glacier.
The field team included USGS geologists Rob Witter, Adrian Bender, Chris DuRoss, Peter Haeussler, Richard Lease and Kate Scharer
View of Glacier Bay National Park from the air.
This video presents a visualization of shaking that was recorded in the Frontier Building in Anchorage, Alaska, during the Mw7.1 earthquake, January 24, 2016, Iniskin, Alaska. It exhibits how a tall building behaves and performs during strong earthquake shaking. Note that relative to the height of the building, the motions are magnified by a factor of 300 to show deformation characteristics. This video also shows how structural monitoring projects by the USGS National Strong Motion Project can benefit the engineering and research community by capturing real-life shaking in buildings such as the Frontier Building in seismic areas.
Standing masonry buildings in Kathmandu suggest that shaking was not amplified in the valley sediments surrounding Kathmandu
Major damage was more likely to monuments in Kathmandu, Nepal than more modern structures
A brain coral boulder eight feet in diameter stands 750 feet inland in the British Virgin Islands. Geologists say that the coral was brought ashore, probably alive, by an unusual tsunami or storm between the years 1200 and 1480.
Geologists have discovered evidence that unusual seas detached living corals from a Caribbean reef and scattered them far inland, as boulders, during the last centuries before Columbus arrived. The new findings will reinforce precautions against coastal hazards, Caribbean tsunami specialists said.
Small variations in the density of the earth’s crust—undetectable to humans without sensitive instruments—influence where earthquakes may occur in the central United States. These new findings from the U.S. Geological Survey, published today in Nature Communications, may allow scientists to map where future seismicity in the center of the country is most likely.
The U. S. Geological Survey is seeking volunteers to host temporary seismic stations in the Walnut Creek/Pleasant Hill/Concord California area. Volunteers will be assisting with a new ground motion study that will begin in March 2017.
What is causing most of the induced earthquakes (aka man-made earthquakes) we’ve seen recently in the central United States?
A new study from the USGS suggests that some early 20th century earthquakes in southern California might have been induced (man-made) by past practices that were used by the oil and gas industry.
A magnitude 6.6 earthquake struck Italy on October 30, 2016 at 06:40:19 UTC (7:40 am local time). This is reportedly the largest earthquake in Italy since the magnitude 6.9 Irpinia earthquake struck southern Italy in 1980.
A magnitude 6.1 earthquake struck Italy on October 26, 2016 at 19:18:08 UTC (9:18 pm local). A magnitude 5.5 earthquake struck earlier at 17:10:37 UTC. Numerous smaller aftershocks have also occurred.
Distant wastewater disposal wells likely induced the third largest earthquake in recent Oklahoma record, the Feb. 13, 2016, magnitude 5.1 event roughly 32 kilometers northwest of Fairview, Oklahoma. These findings from the U.S. Geological Survey are available in the online edition of Geophysical Research Letters.
Do you know what to do the moment the ground starts shaking? Drop, Cover, and Hold On!
True or false? The same size earthquake will cause damage over a larger area in the West than the East.
It’s not flirting for submarines, but this week’s EarthWord does feature the ocean...
A possible explosion of magnitude 5.3 occurred in North Korea on September 9, 2016 at 00:30:01 UTC (9:00 am local time).