Incorporated Research Institutes for Seismology (IRIS).The 2008 USGS seismic hazard maps, which are the basis of building codes. Report of the Independent Expert Panel on New Madrid Seismic Zone Earthquake Hazards (2011) (1.8 MB PFD) The publication, Earthquake Hazard Mitigation in the New Madrid Seismic Zone.
#Usgs earth quake map update
The geologic record of pre-1811 earthquakes reveals that the New Madrid seismic zone has repeatedly produced sequences of major earthquakes, including several of magnitude 7 to 8, over the past 4,500 years. Update time Mon Jun 12 02:00:04 2023 Here are the earthquakes appearing on this map, most recent at top. Hundreds of aftershocks were felt in 1813. The first earthquake was followed by 6 aftershocks in the range M5.5-6.3 in the first 2 days. The 1811-1812 New Madrid sequence consisted of three large earthquakes: Earthquakes in the Central United States: 1699-2002 New Madrid Seismic Zone Putting Down Roots in Earthquake CountryYour Handbook for Earthquakes in the Central United States Organizations. These maps are used in determining building seismic codes, insurance rates, and other public decisions. Hazard Map All Earthquakes 1900 - Present Topics of Interest. Larger earthquakes are represented by larger circles. Geological Survey (USGS) National Seismic Hazard Map shows the strength of ground shaking that has a 1 in 50 chance of being exceeded in a particular place in the lower 48 states over a period of 50 years. Green circles denote earthquakes that occurred prior to 1974 (USGS Professional Paper 1527). Red circles indicate earthquakes that occurred from 1974 to 2002 with magnitudes larger than 2.5 located using modern instruments (University of Memphis). This map shows earthquakes (circles) of the New Madrid and Wabash Valley seismic zones (orange patches).
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