Deformation across the Salton Trough, California, 1973-1977

Journal of Geophysical Research B: Solid Earth
By: , and 

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Abstract

A trilateration network extending across the San Andreas, San Jacinto, and Elsinore faults in the vicinity of the Salton Sea, California, has been surveyed to very high precision several times in the 5‐year interval 1973–1977. The average strain across the entire network is essentially a uniaxial north‐south contraction at the rate of about 0.3 μstrain/a. There is no substantial strain perpendicular to the Salton trough, indicating no tendency to either open or close that rift. The observed uniaxial north‐south contraction differs from a pure shear parallel to the major faults by a uniform dilatation of about −0.25 μstrain/a that is only partly explained. The shear strain across the network reaches a maximum near the San Jacinto fault and could be explained by right lateral slip at depth on that fault. The displacement pattern also suggests right lateral slip at depth on the San Jacinto fault with total right lateral relative movement near 50 mm/a across the 120‐km breadth of the network. The deformation appears to be uniform in time in the 1973–1977 interval. A dislocation model of the deformation suggests about 50±15 mm/a of relative right lateral slip at depth distributed between the San Andreas, San Jacinto, and Elsinore faults and demonstrates that a significant average dilatation can be generated by pure strike slip on several subparallel faults.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Deformation across the Salton Trough, California, 1973-1977
Series title Journal of Geophysical Research B: Solid Earth
DOI 10.1029/JB084iB06p03069
Volume 84
Issue B6
Year Published 1979
Language English
Publisher American Geophysical Union
Contributing office(s) Earthquake Science Center, Volcano Science Center
Description 11 p.
First page 3069
Last page 3079
Country United States
State California
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