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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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344:. USGS Earthquake Hazards Program. October 27, 2009. Archived from
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295:. 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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289:"... relationship between Quaternary faults and earthquakes"
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as a cause. Effects of movement on an active fault include
249:"Evaluation of Active Faulting and Associated Hazards"
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The
Alquist-Priolo Earthquake Fault Zoning (AP) Act
204:. USGS Earthquake Hazards Program. November 3, 2009
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402:Quaternary Fault and Fold Database for the Nation
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247:Slemmons, D. Burton; and Defolo, Craig (1986).
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253:Active Tectonics: Impact on Society
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167:New Madrid, Missouri in 1811–1812
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318: This article incorporates
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220: This article incorporates
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373:United States Geological Survey
324:United States Geological Survey
226:United States Geological Survey
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177:northeast of Boston in 1755.
391:Active faults of New Zealand
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156:Geologic conditions in U.S.
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171:Charleston, South Carolina
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257:National Academies Press
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222:public domain material
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108:reflection seismology
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351:on November 27, 2011
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58:tectonic deformation
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54:strong ground motion
202:Earthquake Glossary
175:Cape Ann earthquake
259:. pp. 45–48.
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349:(online web page)
342:Quaternary Faults
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293:Quaternary Faults
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353:. Retrieved
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143:Measurement
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355:2011-09-17
306:2011-09-17
208:2011-09-17
181:References
104:seismology
92:geological
85:Quaternary
62:landslides
39:earthquake
116:geodetics
66:rockfalls
411:Category
130:Location
90:Related
87:Period.
74:tsunamis
78:seiches
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255:. The
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
