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Viscoelastic Flow in the Lower Crust after the 1992 Landers, California, Earthquake

Deng, Jishu and Gurnis, Michael and Kanamori, Hiroo and Hauksson, Egill (1998) Viscoelastic Flow in the Lower Crust after the 1992 Landers, California, Earthquake. Science, 282 (5394). pp. 1689-1692. ISSN 0036-8075. doi:10.1126/science.282.5394.1689.

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Space geodesy showed that broad-scale postseismic deformation occurred after the 1992 Landers earthquake. Three-dimensional modeling shows that afterslip can only explain one horizontal component of the postseismic deformation, whereas viscoelastic flow can explain the horizontal and near-vertical displacements. The viscosity of a weak, about 10-km-thick layer, in the lower crust beneath the rupture zone that controls the rebound is about 10^(18) pascal seconds. The viscoelastic behavior of the lower crust may help to explain the extensional structures observed in the Basin and Range province and it may be used for the analysis of earthquake hazard.

Item Type:Article
Related URLs:
URLURL TypeDescription
Gurnis, Michael0000-0003-1704-597X
Kanamori, Hiroo0000-0001-8219-9428
Hauksson, Egill0000-0002-6834-5051
Additional Information:© 1998 American Association for the Advancement of Science. Received 17 August 1998; accepted 2 November 1998. We thank M. Simons for a critical review of the manuscript and G. Peltzer, J. Savage, C. Scholz, K. Sieh, M. Spiegelman, L. Sykes, T. L. Teng, W. Thatcher, and many people in the seismo lab for discussion. This research was supported by SCEC. SCEC is funded by NSF Cooperative Agreement EAR-8920136 and USGS Cooperative Agreements 14-08-0001-A0899 and 1434-HQ-97AG01718. This is SCEC contribution 446 and contribution number 8574 of the Division of Geological and Planetary Sciences, California Institute of Technology.
Group:Seismological Laboratory
Funding AgencyGrant Number
Southern California Earthquake Center (SCEC)UNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Southern California Earthquake Center (SCEC)446
Caltech Division of Geological and Planetary Sciences8574
Issue or Number:5394
Record Number:CaltechAUTHORS:20130506-151711974
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Official Citation:Viscoelastic Flow in the Lower Crust after the 1992 Landers, California, Earthquake Jishu Deng, Michael Gurnis, Hiroo Kanamori, and Egill Hauksson Science 27 November 1998: 282 (5394), 1689-1692.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38301
Deposited By: Tony Diaz
Deposited On:15 May 2013 22:27
Last Modified:09 Nov 2021 23:36

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