The U.S. Geological Survey began forecasting aftershocks after the 1989 Loma Prieta earthquake. After an earthquake in California of magnitude 5 or larger, the USGS posts the probability of strong aftershocks at its web site:
Web site
USGS researchers have written a number of papers and articles on aftershocks and aftershock hazards. Please see ATC TechBrief 2
Additional information is available at these Web sites:
http://www-socal.wr.usgs.gov/
http://quake.wr.usgs.gov/QUAKES/FactSheets/QuakeForecasts
http://www.scecdc.scec.org/lifewafter.html
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