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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.
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.
View recent events or search for past earthquakes. Optimized for mobile and desktop.
NEHRP turns 40
This year, the National Earthquake Hazards Reduction Program (NEHRP) turns 40, four decades since the Earthquake Hazards Reduction Act of 1977 was enacted establishing the Program, spurring numerous federal, state, and community actions to reduce earthquake losses in the U.S.A. and its territories and setting a standard for earthquake loss‐...Leith, William S.
Reducing risk where tectonic plates collide—U.S. Geological Survey subduction zone science plan
The U.S. Geological Survey (USGS) serves the Nation by providing reliable scientific information and tools to build resilience in communities exposed to subduction zone earthquakes, tsunamis, landslides, and volcanic eruptions. Improving the application of USGS science to successfully reduce risk from these events relies on whole community efforts...Gomberg, Joan S.; Ludwig, Kristin A.; Bekins, Barbara; Brocher, Thomas M.; Brock, John C.; Brothers, Daniel; Chaytor, Jason D.; Frankel, Arthur; Geist, Eric L.; Haney, Matt; Hickman, Stephen H.; Leith, William S.; Roeloffs, Evelyn A.; Schulz, William H.; Sisson, Thomas W.; Wallace, Kristi; Watt, Janet; Wein, Anne
Reducing risk where tectonic plates collide
Most of the world’s earthquakes, tsunamis, landslides, and volcanic eruptions are caused by the continuous motions of the many tectonic plates that make up the Earth’s outer shell. The most powerful of these natural hazards occur in subduction zones, where two plates collide and one is thrust beneath another. The U.S. Geological Survey’s (USGS) “...Gomberg, Joan S.; Ludwig, Kristin A.
Advanced National Seismic System—Current status, development opportunities, and priorities for 2017–2027
SummaryEarthquakes pose a threat to the safety of over 143 million people living in the United States. Earthquake impacts can be significantly reduced if communities understand their risk and take proactive steps to mitigate that risk. The Advanced National Seismic System (ANSS) is a cooperative effort to collect and analyze seismic and geodetic...
Origins of a national seismic system in the United States
This historical review traces the origins of the current national seismic system in the United States, a cooperative effort that unifies national, regional, and local‐scale seismic monitoring within the structure of the Advanced National Seismic System (ANSS). The review covers (1) the history and technological evolution of U.S. seismic...Filson, John R.; Arabasz, Walter J.
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
The comparative limnology of Lakes Nyos and Monoun, Cameroon
Lakes Nyos and Monoun are known for the dangerous accumulation of CO2 dissolved in stagnant bottom water, but the shallow waters that conceal this hazard are dilute and undergo seasonal changes similar to other deep crater lakes in the tropics. Here we discuss these changes with reference to climatic and water-column data collected at both lakes...Kling, George; Evans, William C; Tanyileke, Gregory
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, Earthquake
We test the feasibility of rapidly detecting and characterizing earthquakes with the Quake‐Catcher Network (QCN) that connects low‐cost microelectromechanical systems accelerometers to a network of volunteer‐owned, Internet‐connected computers. Following the 3 September 2010 M 7.2 Darfield, New Zealand, earthquake we installed over 180 QCN sensors...Lawrence, 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 earthquakes
On 2010 March 11, a sequence of large, shallow continental crust earthquakes shook central Chile. Two normal faulting events with magnitudes around Mw 7.0 and Mw 6.9 occurred just 15 min apart, located near the town of Pichilemu. These kinds of large intraplate, inland crustal earthquakes are rare above the Chilean subduction zone, and it is...Ruiz, 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, 2011-2012
The primary purpose of this report is to provide drafted field logs of exploratory trenches excavated across the Berryessa Fault section of the northern Green Valley Fault (Lienkaemper, 2012; Lienkaemper and others, 2013) in 2011 and 2012 that show evidence for at least one surface-rupturing earthquake in the past few centuries. The site location...Lienkaemper, 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 fault
This report presents a global dataset of site-specific surface-displacement data on faults. We have compiled estimates of successive displacements attributed to individual earthquakes, mainly paleoearthquakes, at sites where two or more events have been documented, as a basis for analyzing inter-event variability in surface displacement on...Hecker, Suzanne; Sickler, Robert; Feigelson, Leah; Abrahamson, Norman; Hassett, Will; Rosa, Carla; Sanquini, Ann
Map of historic seismicity, major faults, and paleoseismic summary of San Andreas Fault system.
A team of USGS scientists spent two weeks in the isolated Glacier Bay National Park, exploring one of the fastest-moving faults in North America.
Title: Underwater Secrets of the Hayward Fault Zone: Integrated 3D imaging to understand earthquake hazards
- Underwater imaging provides a unique opportunity to study urban fault hazards.
- How do we link surface structures to depths where earthquakes occur?
- How does "acoustic trenching" help us understand earthquake history?
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.
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.
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.
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.
The USGS has up-to-date details on the November 30, 2017 event.
The USGS has up-to-date details on the November 12, 2017 event.
Do you know what to do the moment the ground starts shaking? Drop, Cover, and Hold On!
Just after Labor Day, U.S. Geological Survey field crews began digging a trench within the Jackson Hole Mountain Resort ski area, on the lower reaches of Buffalo Bowl.
A magnitude 8.1earthquake struck offshore Chiapas, Mexico on September 7, 2017 at 11:49 local time (September 8 at 04:49UTC).
With hurricanes in the east and wildfires in the west, natural hazards have the potential to impact a majority of Americans every year. USGS science provides part of the foundation for emergency preparedness whenever and wherever disaster strikes.
The U.S. Geological Survey awarded approximately $4.9 million this week to six universities and a university-governed non-profit, to support transitioning the west coast “ShakeAlert” earthquake early warning system into a production system.
Editor: In the public interest and in accordance with Federal Aviation Administration regulations, the USGS is announcing this low-level airborne project. Your assistance in informing the local communities is appreciated.
After the next significant earthquake, many sources will be disseminating information from a variety of accounts, tools and services.
A new U.S. Geological Survey-led study suggests that earthquake-related deformation just below the Earth's surface can be quite different from how it is expressed at the surface.
The USGS has up-to-date details on the July 6, 2017 event.
Earthquakes are estimated to cost the nation $6.1 billion annually in building stock losses according to an updated report published today by FEMA.