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Geodetic measurement of deformation in the Ventura basin region, southern CaliforniaWe have measured the deformation in the Ventura basin region, southern California, with Global Positioning System (GPS) measurements carried out over 4.6 years between 1987 and 1992. The deformation within our network is spatically variable on scales of tens of kilometers, with strain rates reaching 0.6 +/- 1 micro-rad/yr in the east-central basin. Blocklike rotations are observed south and northwest of the basin where the maximum shear strain rates are an order of magnitude lower (0.06 +/- 1 micro-rad/yr to the south). We also observed clockwise rotations of 1 deg - 7 deg/m.y. Shear strain rates determined by comparing angle changes from historical triangulation spanning several decades and GPS measurements give consistent, though less precise, results. The geodetic rates of shortening across the basin and Western Transverse Ranges are lower than those estimated from geological observations, but the patterns of deformation from the two methods agree qualitatively.
Document ID
19950046126
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Donnellan, Andrea
(Jet Propulsion Lab. Pasadena, CA, United States)
Hager, Bradford H.
(Massachusetts Inst. of Tech., Cambridge, MA United States)
King, Robert W.
(Massachusetts Inst. of Tech., Cambridge, MA United States)
Herring, Thomas A.
(Massachusetts Inst. of Tech., Cambridge, MA United States)
Date Acquired
August 16, 2013
Publication Date
December 10, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: B12
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
95A77725
Funding Number(s)
CONTRACT_GRANT: NAG5-737
CONTRACT_GRANT: NAG5-1132
CONTRACT_GRANT: NAG5-842
CONTRACT_GRANT: NSF EAR-86-18542
CONTRACT_GRANT: NSF EAR-86-18513
Distribution Limits
Public
Copyright
Other

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