Prolonged post-seismic deformation of the 1960 great Chile earthquake and implications for mantle rheology

被引:77
作者
Khazaradze, G [1 ]
Wang, K
Klotz, J
Hu, Y
He, J
机构
[1] Geoforschungszentrum Potsdam, D-14473 Potsdam, Germany
[2] Geol Survey Canada, Pacific Geosci Ctr, Sidney, BC V8L 4B2, Canada
[3] Univ Victoria, Sch Earth & Ocean Sci, Victoria, BC, Canada
关键词
D O I
10.1029/2002GL015986
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
[1] 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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