Postseismic Viscoelastic Rebound

Details Postseismic Viscoelastic Rebound Postseismic Viscoelastic Rebound

Jan 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974sci...183..204n&link_type=abstract

Science, Volume 183, Issue 4121, pp. 204-206

Physics

78

Scientific paper

The sudden appearance of a dislocation, representing an earthquake, in an elastic layer (the lithosphere) overriding a viscoelastic half space (the asthenosphere) is followed by time-dependent surface deformation, which is very similar to in situ postseismic deformation. The spectacular postseismic deformation following the large Nankaido earthquake of 1946 yields for the asthenosphere a viscosity of 5 × 1019 poise and a 50 percent relaxation of the shear modulus. Large thrust type earthquakes may provide, in the future, a new method for exploring the rheology of the earth's upper mantle.

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