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GEOREF RECORD

Transient stress-coupling between the 1992 Landers and 1999 Hector Mine, California, earthquakes

Timothy Masterlark and Herbert F. Wang
Transient stress-coupling between the 1992 Landers and 1999 Hector Mine, California, earthquakes (in The Hector Mine, California, earthquake of 16 October 1999, Michael J. Rymer (editor), Victoria E. Langenheim (editor) and Egill Hauksson (editor))
Bulletin of the Seismological Society of America (May 2002) 92 (4): 1470-1486

Abstract

A three-dimensional finite-element model (FEM) of the Mojave block region in southern California is constructed to investigate transient stress-coupling between the 1992 Landers and 1999 Hector Mine earthquakes. The FEM simulates a poroelastic upper-crust layer coupled to a viscoelastic lower-crust layer, which is decoupled from the upper mantle. FEM predictions of the transient mechanical behavior of the crust are constrained by global positioning system (GPS) data, interferometric synthetic aperture radar (InSAR) images, fluid-pressure data from water wells, and the dislocation source of the 1999 Hector Mine earthquake. Two time dependent parameters, hydraulic diffusivity of the upper crust and viscosity of the lower crust, are calibrated to 10 (super -2) m (super 2) .sec (super -1) and 5X10 (super 18) Pa.sec respectively. The hydraulic diffusivity is relatively insensitive to heterogeneous fault-zone permeability specifications and fluid-flow boundary conditions along the elastic free-surface at the top of the problem domain. The calibrated FEM is used to predict the evolution of Coulomb stress during the interval separating the 1992 Landers and 1999 Hector Mine earthquakes. The predicted change in Coulomb stress near the hypocenter of the Hector Mine earthquake increases from 0.02 to 0.05 MPa during the 7-yr interval separating the two events. This increase is primarily attributed to the recovery of decreased excess fluid pressure from the 1992 Landers coseismic (undrained) strain field. Coulomb stress predictions are insensitive to small variations of fault-plane dip and hypocentral depth estimations of the Hector Mine rupture.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 92
Serial Issue: 4
Title: Transient stress-coupling between the 1992 Landers and 1999 Hector Mine, California, earthquakes
Title: The Hector Mine, California, earthquake of 16 October 1999
Author(s): Masterlark, TimothyWang, Herbert F.
Author(s): Rymer, Michael J.editor
Author(s): Langenheim, Victoria E.editor
Author(s): Hauksson, Egilleditor
Affiliation: U. S. Geological Survey, EROS data Center, Sioux Falls, SD, United States
Affiliation: U. S. Geological Survey, Menlo Park, CA, United States
Pages: 1470-1486
Published: 200205
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 57
Accession Number: 2002-064947
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables, geol. sketch maps
N34°00'00" - N35°00'00", W117°00'00" - W116°00'00"
Secondary Affiliation: California Institute of Technology, USA, United StatesUniversity of Wisconsin-Madison, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200220
Program Name: USGSOPNon-USGS publications with USGS authors
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