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In contrast, in the
Central and Eastern U.S. (CEUS) the crust is thicker, colder, older, and more stable. Furthermore, the CEUS is thousands of miles from active plate boundaries, so the rates of deformation are low in this region. Nevertheless, the CEUS has had some rather large earthquakes in
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and magnetic measurements, as well as other ways. Several types of data, such as seismologic reports or records over time, are used to gauge fault activity. Activity and fault area are correlated, and risk analysis is employed with other factors to determine the potential earthquake hazard.
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The geologic conditions and plate tectonic setting in much of the
Western U.S. has resulted in the region being underlain by relatively thin crust and having high heat flow, both of which can favor relatively high deformation rates and active faulting.
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boundaries, and active fault research has focused on these regions. Active faults tend to occur less within the area of any given plate. The fact that intraplate regions may also present seismic hazards has only recently been recognized.
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sometime in the future. Geologists commonly consider faults to be active if there has been movement observed or evidence of seismic activity during the last 10,000 years.
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Quaternary faults are those active faults that have been recognized at the surface and which have evidence of movement during the
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Organizations that authored this book: Geophysics Study
Committee, Geophysics Research Forum, National Research Council
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Various geologic methods are used to define the boundaries of an active fault such as
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Geological fault likely to be the source of an earthquake sometime in the future
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355:. USGS Earthquake Hazards Program. October 27, 2009. Archived from
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306:. USGS Earthquake Hazards Program. October 27, 2009. Archived from
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historical times, including a series of major earthquakes near
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as a cause. Effects of movement on an active fault include
260:"Evaluation of Active Faulting and Associated Hazards"
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The
Alquist-Priolo Earthquake Fault Zoning (AP) Act
215:. USGS Earthquake Hazards Program. November 3, 2009
413:Quaternary Fault and Fold Database for the Nation
258:Slemmons, D. Burton; and Defolo, Craig (1986).
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264:Active Tectonics: Impact on Society
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178:New Madrid, Missouri in 1811–1812
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384:United States Geological Survey
335:United States Geological Survey
237:United States Geological Survey
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188:northeast of Boston in 1755.
402:Active faults of New Zealand
167:Geologic conditions in U.S.
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182:Charleston, South Carolina
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362:on November 27, 2011
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213:Earthquake Glossary
186:Cape Ann earthquake
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353:Quaternary Faults
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304:Quaternary Faults
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192:References
115:seismology
103:geological
96:Quaternary
73:landslides
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127:geodetics
77:rockfalls
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141:Location
101:Related
98:Period.
85:tsunamis
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