NEAR-SURFACE IN SITU STRESS: 1. STRAIN RELAXATION MEASUREMENTS ALONG THE SAN ANDREAS FAULT IN SOUTHERN CALIFORNIA.

Marc L. Sbar, Randall Richardson, Christopher Flaccus, Terry Engelder

Research output: Contribution to journalArticle

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Abstract

Strain relaxation stress measurements were made in the Mojave Desert southeast of Palmdale, California, displacements two sites during the summers of 1979 and 1980. The field data and finite element modeling studies demonstrate that thermally induced stress dominates the results obtained in the upper 6 m. At depths greater than 6 m the average orientation for the horizontal maximum compressive stress at these sites in N22 degree W plus or minus 9 degree at 2 km south of the San Andreas fault and N13 degree W plus or minus 2 degree at 20 km north of the fault. Finite element models of the San Andreas fault in southern California develop stress field similar to that observed regionally away from the fault when displacement corresponding to relative motion between lithospheric plates are applied on the boundaries of the models. Near the fault, however, the model principal stresses are rotated counterclockwise similar to those measured near Palmdale, demonstrating the influence of the faults on the principal stress orientations.

Original languageEnglish (US)
Pages (from-to)9323-9332
Number of pages10
JournalJournal of Geophysical Research: Space Physics
Volume89
Issue numberB11
StatePublished - Jan 1 1984

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San Andreas Fault
Strain relaxation
strain measurement
Southern California
in situ stress
Mojave Desert (CA)
fault displacement
stress measurement
Stress measurement
Compressive stress
stress field
stress distribution
summer
desert
modeling

ASJC Scopus subject areas

  • Engineering(all)
  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

NEAR-SURFACE IN SITU STRESS : 1. STRAIN RELAXATION MEASUREMENTS ALONG THE SAN ANDREAS FAULT IN SOUTHERN CALIFORNIA. / Sbar, Marc L.; Richardson, Randall; Flaccus, Christopher; Engelder, Terry.

In: Journal of Geophysical Research: Space Physics, Vol. 89, No. B11, 01.01.1984, p. 9323-9332.

Research output: Contribution to journalArticle

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