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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
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.
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It is part of: Geophysical Research Letters, 2002, vol. 29, num. 22, p. 2050-2053
ISSN: 0094-8276
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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