Earthquake Data and Sources Links

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DATA SOURCES Links and Information

Realtime Earthquakes Data Sources & Contributing Networks
US, International, and Offshore Regions
National Earthquake Information Center (NEIC)
West Coast & Alaska Tsunami Warning Center
Pacific Tsunami Warning Center
Alaska Earthquake Information Center (AEIC)
Alaska Volcano Observatory
Central and Southeastern US
Cooperative Central and Southeast U.S. Seismic Network CERI/SLU/VPI/USC/...

The participating institutions are:
Delaware Geological Survey
Maryland Geological Survey Seismic Network
University of Memphis - Center of Earthquake Research and Information (CERI)
Saint Louis University (SLU)
University of Tennessee/Tennessee Valley Authority - Joint Institute for Energy and Environment
University of South Carolina (USC) Seismology
Virginia Tech (VPI)
Hawaiian Volcano Observatory Network
Univ. of Nevada, Reno, Seismological Laboratory
Lamont-Doherty Cooperative Seismographic Network (LCSN)

The participating institutions are:
Lamont-Doherty Earth Observatory of Columbia University
Geological Survey of Canada
Ohio Seismic Network
Southern Ontario Seismic Network
Northern California
Northern California Seismic Network (NCSN)
Berkeley Digital Seismic Network (BDSN)

The participating institutions are:
U.S. Geological Survey, Menlo Park
Univ. of California, Berkeley, Seismological Laboratory
Data archive at Northern California Earthquake Data Center (NCEDC)
Pacific Northwest
Pacific Northwest Seismograph Network

The participating institutions are:
Univ. of Washington, Dept. of Earth and Space Sciences
Oregon State University Geophysics Group
University of Oregon Department of Geology
Puerto Rico
University of Puerto Rico, Puerto Rico Seismic Network
Southern California
Southern California Seismic Network (SCSN): a cooperative project.

The participating institutions are:
U.S. Geological Survey, Pasadena
California Institute of Technology, Seismological Laboratory
University of California, San Diego
Data archive at Southern California Earthquake Data Center (SCEDC)
Utah and Yellowstone
Univ. of Utah Seismograph Stations, Salt Lake City
All members of the ...
Advanced National Seismic System (ANSS)
Map Information and Data Sources
Topographic Data

This data was acquired from the General Bathymetric Chart of the Oceans (GEBCO) project at: The data in its original form is 30 arc-second bathymetry data for the entire globe. Land data is supplemented in most cases by Shuttle Radar Topography Mission (SRTM30) digital elevation model. For detailed cache levels, this data was resampled dynamically by ArcGIS Desktop software to give users more elevation detail.
Street/Aerial Data

Street and Aerial data, imagery and map information provided by MapQuest, OpenStreetMap and contributors, CC-BY-SA.
Plate Boundary Data

This data was acquired from the Peter Bird Plate Boundary Dataset. Information about this data can be found at:
NOTE: Included plate boundaries were chosen appropriately based on scale.
Water Data
The river and lakes data for these maps came from GMT and its pre-built dataset. The detailed shoreline data that is present in coastal maps was acquired from NOAA’s Coastal Geospatial Data Project. More information can be found at:
State and International Boundaries
State boundaries provided by The National Map
International boundaries provided by
Placename Data:

The placenames were derived from US Census data, such as from International places were gathered from a specially created USGS catalog. Selected places were based on minimum population values that were specified for each particular region. If there are too many places on any map, a separation distance algorithm was used to limit the number of places that appear on the map. If no places appeared on the map, a lower population threshold was used to plot smaller places.

USGS Topographic map tiles created with ArcGIS 10 for Desktop. Interactive web interface powered by OpenLayers.
The data used for these features was acquired from the Hazard Faults Database for the United States.

Known hazardous faults and fault zones in California and Nevada

The known active fault segments in California and Nevada can be seen in Figure 25 of USGS Open-File Report 96-532: National Seismic Hazard Maps, June 1996: Documentation" by Arthur Frankel, Charles Mueller, Theodore Barnhard, David Perkins, E.V. Leyendecker, Nancy Dickman, Stanley Hanson, and Margaret Hopper.

For northern California, the potential sources of earthquakes larger than magnitude 6 are documented in Open-File Report 96-705 by the Working Group on Northern California Earthquake Potential (chaired by Jim Lienkaemper).

For the state as a whole, see "Probabilistic seismic hazard assessment for the State of California" by Petersen, M. D., Bryant, W.A., Cramer, C.H., Cao, T., Reichle, M.S., Frankel, A.D., Lienkaemper, J.J., McCrory, P.A., and Schwartz, D.P, 1996 (California Division of Mines and Geology Open-File Report 96-08; [published jointly as] U.S. Geological Survey Open-File Report 96-706).

The faults and fault zones described in these reports are known to have been active in the last 2 million years and are thought to pose a measurable hazard.

For California the faults on the individual zoomed-in and special maps come from the three categories of faults believed to have been active in the last 700,000 years shown on the "Preliminary Fault Activity Map of California" by C.W. Jennings (1992, California Division of Mines and Geology Open-File Report 92-03). This map has been superseded by Jennings, C.W., 1994, Fault activity map of California and adjacent areas, with locations and ages of recent volcanic eruptions: California Division of Mines and Geology, Geologic Data Map No. 6, map scale 1:750,000.

For Nevada the faults on the individual zoomed-in and special maps come from USGS Open-File Report 96-532 mentioned above.

For more information on files and images discussed above visit the1996 Documentation Page
Highways and Roads
Interstate Highway data is from the National Atlas of the United States.
Network Contacts

National Earthquake Information Center (NEIC)

U.S. Geological Survey
National Earthquake Information Center
Box 25046, DFC, MS 967
Denver, Colorado 80225

Earthquake Information Line: 303-273-8500 (24x7 Opertions)
Fax: 303-273-8450
Web Page:

Alaska Earthquake Information Center (AEIC)

Alaska Earthquake Information Center (AEIC)
Geophysical Institute
University of Alaska Fairbanks
903 Koyukuk Drive
Fairbanks, AK 99775-7320

Voice: 907-474-7320
Fax: 907-474-7125
Web Page:

West Coast and Alaska Tsunami Warning Center/NOAA/NWS

West Coast and Alaska Tsunami Warning Center/NOAA/NWS
910 S. Felton St.
Palmer, AK 99645

Web Page:

Cooperative New Madrid Seismic Network

Center for Earthquake Research and Information
Campus Box 526590
The University of Memphis
Memphis, TN 38152

Voice: 901-678-2007
Fax: 901-678-4734
Web Page:

Inter-Mountain West Seismic Networks

Earthquake Studies Office
Montana Bureau of Mines and Geology
1300 West Park Street
Butte, MT 59701-8997

Voice: 406-496-4332
Fax: 406-496-4451
Web Page:

Nevada Seismological Laboratory
University of Nevada, Reno
Reno, Nevada

Voice: 775-784-4975
Fax: 775-784-4165
Web Page:

University of Utah Seismograph Stations
135 South 1460 East
Salt Lake City, Utah 84112-0111

Voice: 801-581-6274
Fax: 801-585-5585
Web Page:

Hawaiian Volcano Observatory Network

U.S. Geological Survey
Hawaiian Volcano Observatory
P O Box 51
Hawaii National Park, Hawaii 96718

Voice: 808-967-7328
Fax: 808-967-8890
Web Page:
Web Page:

Pacific Tsunami Warning Center

US Dept of Commerce
91-270 Fort Weaver Road
EWA Beach, HI 96706-2928

Voice: 808-689-8207
Web Page:


Lamont-Doherty Cooperative Seismographic Network (LCSN)
Lamont-Doherty Earth Observatory of Columbia University
Palisades, NY 10964

Voice: 845-365-8365
Fax: 845-365-8150
Web Page:

Weston Observatory
Department of Geology and Geophysics, Boston College
381 Concord Road Weston, MA 02493-1340

Voice: 617-552-8300
Fax: 617-552-8388
Web Page:

Northern California Seismic Network

U.S. Geological Survey
Seismology Section
345 Middlefield Road - MS 977
Menlo Park, CA 94025

Earthquake Info: 650-329-4025
Voice: 650-329-4085
Fax: 650-329-5163
Web Page:

U.C. Berkeley Seismological Laboratory
207 McCone Hall
U.C. Berkeley
Berkeley, CA 94720-4760

Earthquake Info: 510-642-2160
Voice: 510-642-3977
Fax: 510-643-5811
Web Page:

Pacific Northwest Seismic Network

Univ. of Washington, Dept. of Earth and Space Sciences
Box 351310
Seattle, WA 98195-1310

Earthquake Info: 206-543-7010
Voice: 206-685-8180 (lab) or 206-543-1190 (department)
Fax: 206-543-0489
Web Page:

Puerto Rico Seismic Network

Puerto Rico Seismic Network
Department of Geology
University of Puerto Rico at Mayagüez
PO Box 9017
Mayagüez, PR 00681-9017

Voice: 787-833-8433
Fax: 787-265-1684
Web Page:

Southern California Seismic Network

Southern California Seismic Network
U.S. Geological Survey - Caltech Seismological Laboratory
Pasadena, California

EQ Info: 626/395-6977
Voice: 626/583-7823 or 626/395-6919
Fax: 626/583-7827
Web Page:
Web Page:

Earthquakes Included and Not Included on Maps and Lists

The maps and lists show events which have been located by the USGS and contributing agencies within the last 30 days. They should not be considered to be complete lists of all events in the US and adjacent areas and especially should not be considered to be complete lists of all events M4.5+ in the world.

In most cases, we locate and report on earthquakes worldwide of magnitude 5.0 and larger in 30 minutes or less. Additionally, we locate and report on earthquakes magnitude 4.0 and larger within the contiguous US and populated regions of Alaska within 30 minutes. Earthquakes of magnitude 2.0 or greater within the US and populated regions of Alaska are often rapidly reported if they occur within the region of a contributing local seismic network.

We may not rapidly locate earthquakes smaller than 5.0 outside the US unless they have caused significant damage or are widely felt. Earthquakes this small rarely cause significant damage. At times, some other agency may report an earthquake with a larger magnitude than what we compute from our data, especially for non-US events near magnitude 5.0. If our magnitude for the event is less than magnitude 5.0, we may not issue a rapid report for it.

Earthquakes occurring outside the US and smaller than about magnitude 4.5 can be difficult for the USGS to locate if there are not enough data. The USGS continues to receive data from observatories throughout the world for several months after the events occur. Using those data, we add new events and revise existing events in later publications. For a description of these later publications and the data available, see Scientific Data.

If you think there is a missing earthquake on our maps and lists, there possibly is. Please see the national and regional links for the area of interest on these webpages:
Earthquake Info by State/Territory
Earthquake Info by Country/Region

The magnitude which the USGS considers official for this earthquake is indicated at the top of this page. This was the best available estimate of the earthquake’s size, at the time that this page was created. Other magnitudes associated with web pages linked from here are those determined at various times following the earthquake with different types of seismic data. Although they are legitimate estimates of magnitude, the USGS does not consider them to be the preferred (“official” magnitude for the event.
Regional Names and References to Places

The list of reference places from the earthquake epicenter is automatically created using a database of placenames and an algorithm that chooses several locations as references. The number of placenames depends on the location of the earthquake. We use the GeoRef database and supplement it with additional placenames for locations distant from any cities (such as ocean ridges).

As an agency of the U.S. Government, we are expected to use the names and spellings approved by the U.S. Board on Geographic Names. Any requests to approve additional names should be made to the U.S. Board on Geographic Names. For more information, see their website at

The region name is an automatically generated name based on the Flinn-Engdahl (F-E) seismic and geographical regionalization scheme. The boundaries of these regions are defined at one-degree intervals and therefore differ from irregular political boundaries. For example, F-E region 545 (Northern Italy) also includes small parts of France, Switzerland, Austria and Slovenia and F-E region 493 (Chesapeake Bay Region) includes all of the State of Delaware, plus parts of the District of Columbia, Maryland, New Jersey, Pennsylvania and Virginia. Beginning with January 2000, the 1995 revision to the F-E code has been used in the QED and PDE listings. This revision includes 28 additional regions, which were defined by subdividing larger regions to provide better coverage for Northwest Africa, Southeast Asia and seismic zones along oceanic ridges. In recent years, additional polygons have been defined in some areas to agree better with irregular political boundaries and to provide some additional detail.

Young, J.B., Presgrave, B.W., Aichele, H., Wiens, D.A. and Flinn, E.A., 1996, The Flinn-Engdahl Regionalisation Scheme: the 1995 revision, Physics of the Earth and Planetary Interiors, v. 96, p. 223-297.
Flinn, E.A., Engdahl, E.R. and Hill, A.R., 1974, Seismic and geographical regionalization, Bulletin of the Seismological Society of America, vol. 64, p. 771-993.
Flinn, E.A., and Engdahl, E.R., 1965, A proposed basis for geographical and seismic regionalization, Reviews of Geophysics, vol. 3, p. 123-149.