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

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

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29v...7k&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 22, pp. 7-1, CiteID 2050, DOI 10.1029/2002GL015986

Physics

10

Geodesy And Gravity: Crustal Movements-Interplate (8155), Geodesy And Gravity: Space Geodetic Surveys, Seismology: Earthquake Parameters, Seismology: Theory And Modeling, Tectonophysics: Rheology-Mantle

Scientific paper

Contemporary crustal deformation of the southern Andean margin shows an interesting feature: While nearly all coastal GPS sites move landward, consistent with inter-seismic deformation near a locked subduction fault, sites 300-400 km landward of the rupture region of the Mw9.5 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 × 1019 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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