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What Is an Earthquake?
Magnitude and Intensity
Earthquake Frequency in the Central Appalachians
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97 earthquakes Algermission April Central Appalachians damage Zone December 13 earth earth's crust Earthquake Frequency Earthquake History Earthquake information earthquake magnitude Earthquakes 1968 earthquakes occur Economic Survey Environmental Geology Bulletin environmental-impact statements epicenter Erwin especially on upper evaluate expect minor damage expect moderate damage February 21 felt focus future earthquake Geological and Economic Gutenberg-Richter high-risk History of West Hopefully January July 15 June known earthquakes Lessing and R. S. March Mercalli Intensity Scale Modified Mercalli Intensity Morgan town nitude North Carolina November numerous October 29 October 9 Persons driving motorcars Peter Lessing predict their occurrence quake occurs R. S. Reppert recorded relative earthquake Reppert and Peter risk map run outdoors San Andreas fault San Francisco Sanitary Landfill Sites seismic activity Seismic Risk Seismic theory seismograms Figure seismology September 9 shock waves South Carolina specially designed structures Standing motorcars struc tures U. S. Gov't United States Earthquakes West Virginia Geological