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SEISMIC HAZARD MAPS OF IOWA AND SURROUNDING REGION Maps prepared by the U.S. Geological Survey National Seismic Hazard Mapping Project   *  Peak Horizontal Acceleration (10% probability within 50 years)   *  0.2 seconds Spectral Acceleration (10% probability within 50 years)   *  0.2 seconds Spectral Acceleration (5% probability within 50 years)   *  0.2 seconds Spectral Acceleration (2% probability within 50 years)   *  0.3 seconds Spectral Acceleration (10% probability within 50 years)   *  0.3 seconds Spectral Acceleration (5% probability within 50 years)   *  0.3 seconds Spectral Acceleration (2% probability within 50 years)   *  1.0 seconds Spectral Acceleration (10% probability within 50 years)   *  1.0 seconds Spectral Acceleration (5% probability within 50 years)   *  1.0 seconds Spectral Acceleration (2% probability within 50 years)   return to Iowa Earthquakes Homepage