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Colorado Earthquakes and Seismic Hazard
Earthquakes are occasionally felt in Colorado, but rarely cause significant damage. About two dozen earthquakes have caused moderate, localized damage—Modified Mercalli Intensity VI or greater—in historical times. The event of November 1882, probably located north of Denver along the Front Range, is the largest known Colorado earthquake with magnitude estimates ranging from 6.2 to 6.6. The U. S. Geological Survey (USGS) makes probabilistic, national-scale seismic hazard maps that consider hazard not only from specific fault sources, but also from historical background earthquakes that may or may not be associated with known faults. Many non-tectonic earthquakes occur in Colorado, so the formulation of seismicity catalogs for hazard analysis requires special care. Compared to the 2002 edition of the USGS maps, the 2008 hazard has decreased significantly at many sites in Colorado. I illustrate these changes at four sites using some of the analysis tools that are available at the USGS website. Reasons for the differences include updates to seismicity catalogs, fault parameters, and ground-motion attenuation equations, as well as changes in background seismicity modeling.
Colorado Earthquakes and Seismic Hazard
Earthquakes are occasionally felt in Colorado, but rarely cause significant damage. About two dozen earthquakes have caused moderate, localized damage—Modified Mercalli Intensity VI or greater—in historical times. The event of November 1882, probably located north of Denver along the Front Range, is the largest known Colorado earthquake with magnitude estimates ranging from 6.2 to 6.6. The U. S. Geological Survey (USGS) makes probabilistic, national-scale seismic hazard maps that consider hazard not only from specific fault sources, but also from historical background earthquakes that may or may not be associated with known faults. Many non-tectonic earthquakes occur in Colorado, so the formulation of seismicity catalogs for hazard analysis requires special care. Compared to the 2002 edition of the USGS maps, the 2008 hazard has decreased significantly at many sites in Colorado. I illustrate these changes at four sites using some of the analysis tools that are available at the USGS website. Reasons for the differences include updates to seismicity catalogs, fault parameters, and ground-motion attenuation equations, as well as changes in background seismicity modeling.
Colorado Earthquakes and Seismic Hazard
Mueller, Charles S. (author)
Biennial Geotechnical Seminar 2010 ; 2010 ; Denver, Colorado, United States
GeoTrends ; 9-18
2010-10-27
Conference paper
Electronic Resource
English
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