Coseismic fault slip associated with the 1992 Mw 6.1 Joshua Tree, California, earthquake

implications for the Joshua Tree-Landers earthquake sequence

Richard A Bennett, R. E. Reilinger, W. Rodi, Li Yingping Li, M. N. Toksoz, K. Hudnut

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Coseismic surface deformation associated with the Mw 6.1, April 23, 1992, Joshua Tree earthquake is well represented by estimates of geodetic monument displacements at 20 locations independently derived from Global Positioning system and trilateration measurements. In order to determine the long-wavelength distribution of slip over the plane of rupture, a Tikhonov regularization operator is applied to these estimates. The resulting slip distribution yields a geodetic moment estimate of 1.7 × 1018 N m with corresponding maximum slip around 0.8 m. Stress drop estimates are in the range of 2-4 MPa. Most of the aftershocks occur in areas for which the mainshock rupture produced stress increases larger than about 0.1 MPa. In contrast, predicted stress changes are near zero at the hypocenter of the Mw 7.3, June 28, 1992, Landers earthquake. Based on aftershock migrations and the predicted static stress field, it is speculated that redistribution of Joshua Tree-induced stress perturbations played a role in the spatio-temporal development of the earthquake sequence culminating in the Landers event. -from Authors

Original languageEnglish (US)
Pages (from-to)6443-6461
Number of pages19
JournalJournal of Geophysical Research: Space Physics
Volume100
Issue numberB4
StatePublished - 1995
Externally publishedYes

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Fault slips
fault slip
Earthquakes
slip
earthquakes
aftershock
earthquake
rupture
estimates
Landers earthquake 1992
stress change
monument
stress field
Global Positioning System
GPS
perturbation
stress distribution
wavelength
Global positioning system
moments

ASJC Scopus subject areas

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

Cite this

Coseismic fault slip associated with the 1992 Mw 6.1 Joshua Tree, California, earthquake : implications for the Joshua Tree-Landers earthquake sequence. / Bennett, Richard A; Reilinger, R. E.; Rodi, W.; Yingping Li, Li; Toksoz, M. N.; Hudnut, K.

In: Journal of Geophysical Research: Space Physics, Vol. 100, No. B4, 1995, p. 6443-6461.

Research output: Contribution to journalArticle

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abstract = "Coseismic surface deformation associated with the Mw 6.1, April 23, 1992, Joshua Tree earthquake is well represented by estimates of geodetic monument displacements at 20 locations independently derived from Global Positioning system and trilateration measurements. In order to determine the long-wavelength distribution of slip over the plane of rupture, a Tikhonov regularization operator is applied to these estimates. The resulting slip distribution yields a geodetic moment estimate of 1.7 × 1018 N m with corresponding maximum slip around 0.8 m. Stress drop estimates are in the range of 2-4 MPa. Most of the aftershocks occur in areas for which the mainshock rupture produced stress increases larger than about 0.1 MPa. In contrast, predicted stress changes are near zero at the hypocenter of the Mw 7.3, June 28, 1992, Landers earthquake. Based on aftershock migrations and the predicted static stress field, it is speculated that redistribution of Joshua Tree-induced stress perturbations played a role in the spatio-temporal development of the earthquake sequence culminating in the Landers event. -from Authors",
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AU - Rodi, W.

AU - Yingping Li, Li

AU - Toksoz, M. N.

AU - Hudnut, K.

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