Strain Accumulation in the Santa-Barbara Channel - 1970-1988

Citation:
Larsen, SC, Agnew DC, Hager BH.  1993.  Strain Accumulation in the Santa-Barbara Channel - 1970-1988. Journal of Geophysical Research-Solid Earth. 98:2119-2133.

Date Published:

Feb

Keywords:

13 august 1978, deformation, earthquake, fault, global positioning system, kinematics, phase ambiguity resolution, seismic risk, southern-california, transverse ranges, western

Abstract:

Geodetic observations between 1970 and 1988 indicate appreciable strain accumulation in the Santa Barbara Channel, California. Eleven line-length changes from a six-station geodetic network spanning the eastern two-thirds of the channel were determined from electronic distance measurements in 1970/1971 and Global Positioning System observations in 1987/1988. Within this network the strains observed are spatially nonuniform. In the easternmost channel the strain is nearly uniaxial, with convergence of 6.4 +/- 0.9 mm/yr oriented N25-degrees-E +/-5-degrees; this direction is consistent with the seismicity, which is dominated by thrust mechanisms with P axes directed to the northeast. In the central channel the strain is less well determined, but appears to include a significant component of shear that is left-lateral when resolved on an east-west plane.

Notes:

n/a

Website

DOI:

10.1029/92jb02043