Geodetic measurements of horizontal strain near the White Wolf fault, Kern County, California, 1926-1993

Journal of Geophysical Research
By: , and 

Links

Abstract

The White Wolf fault, located north of the Big Bend segment of the San Andreas fault, is the NE‐SW trending, left lateral‐oblique reverse fault responsible for the Ms=7.8 1952 Kern County earthquake. We combined Global Positioning System (GPS) measurements with historical triangulation and trilateration data to determine changes in the strain rate over 7 decades (1926–1993). We reanalyzed the historical geodetic data and calculated an elevated preseismic (1926–1952) maximum shear strain rate urn:x-wiley:01480227:media:jgrb10873:jgrb10873-math-0001 of 0.62±0.16 μstrain/yr across the White Wolf fault. The maximum shear strain rate decreased with distance toward the Garlock fault to 0.09±0.08 μstrain/yr. In the decade following the earthquake (1952–1963), the near fault urn:x-wiley:01480227:media:jgrb10873:jgrb10873-math-0002 was high (0.85±0.23μstrain/yr), and decreased to 0.23±0.13 μstrain/yr across the Garlock fault. In 1993, we resurveyed many of the same monuments with GPS receivers to estimate fault‐crossing and off‐fault strain rates for the preceding 30 years. Across the White Wolf fault, the maximum shear strain rate urn:x-wiley:01480227:media:jgrb10873:jgrb10873-math-0001 dropped to 0.19±0.07 μstrain/yr. The azimuths of the maximum principal strain rates (ϕ) for the 1963–1993 epoch rotate from a fault normal orientation (−57°±15°) across the White Wolf fault to 11°±3°E across the Garlock fault.

Study Area

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Geodetic measurements of horizontal strain near the White Wolf fault, Kern County, California, 1926-1993
Series title Journal of Geophysical Research
DOI 10.1029/96JB03554
Volume 102
Issue B3
Year Published 1997
Language English
Publisher American Geophysical Union
Contributing office(s) California Water Science Center
Description 11 p.
First page 4957
Last page 4967
Country United States
State California
County Kern County
Other Geospatial White Wolf fault