2009 Earthquake Probability Mapping

Please Note: This feature does not include potentially induced seismicity or any earthquake after the year 2006. A probability calculated for a location that is currently experiencing induced earthquakes will not be valid. This tool will underestimate the probability because it is based on the 2008 National Seismic Hazard Maps.

New Feature: This application now supports Alaska locations. Please see below for details.

This web site was designed to display earthquake probabilities that are computed from the source model of the 2008 USGS-National Seismic Hazard Mapping Project (NSHMP) update. The region of model validity is the conterminous (lower 48 states) USA and Alaska. Valid locations in the conterminous 48 states range from [24.6, 50.0] degrees latitude and [-125.0, -65.0] degrees longitude. Valid locations in Alaska range from [50.0, 72.0] degrees latitude and [-200.0, -125.0] degrees longitude.

The generated maps will show the probabilities of earthquakes within a radius of 50 km. A text report of the probabilities for a different, selected radius can also be generated.

  • Location
    • Decimal degrees. See above for valid range.
    • Decimal degrees. See above for valid range.
    OR
    • 5-digit U.S. postal zip code
  • Number of years to consider (integer)
  • Minimum magnitude to consider
  • Report
    • Generate an ASCII text report of probabilities
    • In km (integer). Required for text reports

Although this information is a product of the U.S. Geological Survey, we provide no warranty, expressed or implied, as to the accuracy of the data contained therein. This tool is not a substitute for technical subject-matter knowledge.

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