Geodetic measurement of deformation in the Ventura basin region, southern California

Journal Article · Wed Dec 01 04:00:00 EST 1993 · Journal of Geophysical Research

DOI:https://doi.org/10.1029/93JB02766· OSTI ID:79461

Donnellan, A; Hager, B H; King, R W; Herring, T A ^[1]

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1. Jet Propulsion Lab., Pasadena, CA (United States)

We 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.

• Research Organization: Jet Propulsion Lab., Pasadena, CA (United States)
• OSTI ID: 79461
• Journal Information: Journal of Geophysical Research, Journal Name: Journal of Geophysical Research Journal Issue: B12 Vol. 98; ISSN JGREA2; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
CALIFORNIA
DEFORMATION
GEODESY
GEODETIC SURVEYS
GEOLOGIC FAULTS
REMOTE SENSING
TECTONICS