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A study of tectonic activity in the Basin-Range Province and on the San Andreas Fault. No. 3: Kinematics of Great Basin intraplate extension from earthquake, geodetic and geologic informationStrain rates assessed from brittle fracture, associated with earthquakes, and total brittle-ductile deformation measured from geodetic data were compared to paleostrain from Quaternary geology for the intraplate Great Basin of the western United States. These data provide an assessment of the kinematics and mode of lithospheric extension that the western U.S. Cordillera has experienced in the last 5 to 10 million years. Strain and deformation rates were determined by the seismic moment tensor method using historic seismicity and fault plane solutions. Contemporary deformation of the Great Basin occurs principally along the active seismic zones. The earthquake related strain shows that the Great Basin is characterized by regional E-W extension at 8.4 mm/a in the north that diminishes to NW-SE extension of 3.5 mm/a in the south. Zones of maximum extension correspond to belts of shallow crust, high heat flow, and Quaternary basaltic volcanism, suggesting that these parameters are related through an effect such as a stress relaxation allowing bouyant uplift and ascension of magmas.
Document ID
19860008460
Document Type
Thesis/Dissertation
Authors
Eddington, P. K. (Utah Univ. Salt Lake City, UT, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1986
Subject Category
GEOPHYSICS
Report/Patent Number
NAS 1.26:176500
NASA-CR-176500
Funding Number(s)
CONTRACT_GRANT: NAG5-164
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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