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A study of tectonic activity in the Basin-Range Province and on the San Andreas Fault. No. 1: Kinematics of Basin-Range intraplate extensionStrain rates assessed from brittle fracture and total brittle-ductile deformation measured from geodetic data were compared to estimates of paleo-strain from Quaternary geology for the intraplate Great Basin part of the Basin-Range, western United States. These data provide an assessment of the kinematics and mode of lithospheric extension that the western U.S. Cordillera has experienced from the past few million years to the present. Strain and deformation rates were determined by the seismic moment tensor method using historic seismicity and fault plane solutions for sub-regions of homogeneous strain. Contemporary deformation in the Great Basin occurs principally along the active seismic zones. The integrated opening rate across the entire Great Basin is accommodated by E-E extension at 8 to 10 mm/a in the north that diminishes to NW-SE extension of 3.5 mm/a in the south. Zones of maximum lithospheric extension correspond to belts of thin crust, high heat flow, and Quaternary basaltic volcanism, suggesting that these parameters are related through mechanism of extension such as a stress relaxation, allowing bouyant uplift and ascension of magmas.
Document ID
19860008458
Document Type
Preprint (Draft being sent to journal)
Authors
Eddington, P. K. (Utah Univ. Salt Lake City, UT, United States)
Smith, R. B. (Utah Univ. Salt Lake City, UT, United States)
Renggli, C. (Eidgenoessische Technische Hochschule Zurich, Switzerland)
Date Acquired
September 5, 2013
Publication Date
January 1, 1986
Subject Category
GEOPHYSICS
Report/Patent Number
NASA-CR-176498
NAS 1.26:176498
Funding Number(s)
CONTRACT_GRANT: NAG5-164
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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