Interferometric synthetic aperture radar observations of the 1994 Double Spring Flat, Nevada, earthquake (M5.9): Main shock accompanied by triggered slip on a conjugate fault

Falk Amelung, John W. Bell

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

The 1994 Double Spring Flat (DSF) earthquake (M5.9) was the largest earthquake to strike Nevada in more than 30 years. It occurred in the Sierra Nevada-Basin and Range Transition Zone within a step-over region between two major normal faults. Descending and ascending ERS interferograms show a maximum range change of 8.5 cm which is the coseismic ground displacement associated with this normal, oblique-slip, moderate-sized earthquake. Elastic inverse modeling and surface displacements across coseismic ground cracks suggest that two different event sources could account for the observed deformation. The first source was the main shock with right-oblique slip on the north-northwest striking DSF fault. The second source was normal faulting on a shallow, north-northeast striking, elongated plane (conjugate to the DSF fault). These two sources are consistent with the pattern of postevent seismicity, and we suggest that the second source represents seismic and aseismic slip triggered by the main shock. Calculations of changes in Coulomb failure stress show that the main shock encouraged normal slip on this plane.

Original languageEnglish (US)
Pages (from-to)ETG 10-1 - 10-11
JournalJournal of Geophysical Research: Solid Earth
Volume108
Issue number9
StatePublished - Sep 10 2003

Keywords

  • Conjugate
  • Earthquake
  • InSAR
  • Interferogram
  • Nevada
  • Trigger

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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