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Title: | Prolonged post-seismic deformation of the 1960 great Chile earthquake and implications for mantle rheology |
Author: | Khazaradze, Giorgi Wang, K. Klotz, J. Hu, Y. He, J. |
Keywords: | Subducció Terratrèmols Xile Subduction Earthquakes Chile |
Issue Date: | 2002 |
Publisher: | American Geophysical Union (AGU) |
Abstract: | Contemporary crustal deformation of the southern Andean margin shows an interesting feature: While nearly all coastal GPS sites move landward, consistent with interseismic deformation near a locked subduction fault, sites 300-400 km landward of the rupture region of the M-w 9.5 1960 Chile earthquake are moving in the opposite direction. We attribute the seaward motion of these inland sites to a prolonged crustal deformation due to mantle stress relaxation following the 1960 great earthquake. In order to reproduce the observed seaward motion using a three-dimensional finite element model we need to incorporate a mantle viscosity of about 3 x 10(19) Pa s. The possibility that the seaward motion is caused by a silent slip event on the plate interface at large depths cannot be completely excluded, and our analysis provides a working model for future field tests. |
Note: | Reproducció del document publicat a: |
It is part of: | Geophysical Research Letters, 2002, vol. 29, num. 22, p. 2050-2053 |
URI: | http://hdl.handle.net/2445/163191 |
ISSN: | 0094-8276 |
Appears in Collections: | Articles publicats en revistes (Dinàmica de la Terra i l'Oceà) |
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