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Gordon Shields, Kip Allander, Russell Brigham, Ryan Crosbie, Lorenzo Trimble, Mike Sleeman, Richard Tucker, Hongbin Zhan, and John N. Louie
Shallow geophysical survey across the Pahrump Valley fault zone, California-Nevada border
Bulletin of the Seismological Society of America (February 1998), 88(1):270-275
Abstract: Index Terms/Descriptors: Latitude & Longitude:
GeoRef, Copyright 2004, American Geological Institute.
We employ seismic reflection, magnetics, and electromagnetics to locate precisely the southern extension of the Pahrump Valley Fault Zone (PVFZ) and examine its subsurface geometry. The southern extension of the PVFZ is active and represents a potential seismic hazard for Las Vegas. We observe pronounced magnetic and conductivity anomalies, and truncations of reflectors in the seismic profiles coincident with one of three Holocene scarps in southern Pahrump Valley. These geophysical techniques in combination can locate faults more precisely than the presence of eroded scarps.
California; Cenozoic; electromagnetic methods; fault zones; faults; geologic hazards; geometry; geophysical methods; geophysical profiles; geophysical surveys; Holocene; magnetic methods; Nevada; Pahrump Valley; Pahrump Valley fault zone; Quaternary; reflection; scarps; seismic profiles; surveys; United States
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