Foreshocks and pre-events associated with the nucleation of large earthquakes

Details Foreshocks and pre-events associated with the nucleation of large earthquakes Foreshocks and pre-events associated with the nucleation of large earthquakes

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1305s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 10, p. 1305-1308

Mathematics

Logic

8

Earthquakes, Geological Faults, Nucleation, Rupturing, Elastic Properties, Mathematical Models, Propagation Velocity, Shear Stress, Stress Distribution

Scientific paper

We propose a theoretical model which can explain the occurrence of foreshocks and pre-events associated with the nucleation of large earthquakes. We consider a broad weak zone with a locally strong part (asperity) on a fault plane in a two-dimensional framework and examine the transition process from quasi-static nucleation to high-speed rupture propagation through numerical simulations. The dynamic rupture of the asperity occurs in three different manners, as aseismic slip, foreshock or pre-event, depending on the peak stress of the asperity. In all cases the rupture of the asperity accelerates the nucleation of main rupture.

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