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The coseismic displacement fields for the 1992 Landers and 1999 Hector Mine earthquakes in California, from regional GPS observations

Kenneth E. Austin and M. Meghan Miller
The coseismic displacement fields for the 1992 Landers and 1999 Hector Mine earthquakes in California, from regional GPS observations (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): 1365-1376

Abstract

The fortuitous occurrences of the 1992 Landers and the 1999 Hector Mine earthquakes within a regional GPS network established during 1991 in the Mojave Desert allows assessment of earthquake-related deformation for both events. Annual and earthquake-response campaign-mode GPS observations record active deformation in the Mojave Desert over the past decade. We present new displacement fields for both the Landers earthquake and the Hector Mine earthquake, using corrections for well-established 1993 to 1999 velocities to provide robust estimates of coseismic displacement. Each displacement field is compared to a forward elastic dislocation model for the earthquake that integrates geologically and seismologically determined offsets along the Landers rupture and is then used to geodetically constrain an inversion for elastic dislocation. The geodetic data sets provide better resolution of moment magnitude for a given fault plane, and systematically underestimate seismologically determined M (sub w) by 0.06 to 0.07. In addition, during the 1992 to 1999 time interval, the post-Landers earthquake velocities at stations within 40 km its surface rupture provide direct observations that support kinematic loading of the Hector Mine rupture plane. This observation substantiates predictions from recent viscoelastic models.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 92
Serial Issue: 4
Title: The coseismic displacement fields for the 1992 Landers and 1999 Hector Mine earthquakes in California, from regional GPS observations
Title: The Hector Mine, California, earthquake of 16 October 1999
Author(s): Austin, Kenneth E.Miller, M. Meghan
Author(s): Rymer, Michael J.editor
Author(s): Langenheim, Victoria E.editor
Author(s): Hauksson, Egilleditor
Affiliation: Central Washington University, Department of Geological Sciences, Ellensburg, WA, United States
Affiliation: U. S. Geological Survey, Menlo Park, CA, United States
Pages: 1365-1376
Published: 200205
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 43
Accession Number: 2002-064939
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables, geol. sketch maps
N34°00'00" - N36°00'00", W118°00'00" - W116°00'00"
Secondary Affiliation: California Institute of Technology, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200220
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