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Seismic radiation from simple models of earthquakes R. Madariaga

Summary: Seismic radiation from simple models of earthquakes
R. Madariaga
, J.P. Ampuero
and M. Adda-Bedia +

Laboratoire de G´eologie de l'´Ecole Normale Sup´erieure,
24 rue Lhomond, F­75231 Paris Cedex 05, France.

Institut fuer Geophysik, ETH Z¨urich
Laboratoire de Physique Statistique de l'´Ecole Normale Sup´erieure
October 9, 2006
We review some basic features of shear wave generation and energy balance for a 2D antiplane
rupture. We first study the energy balance for a flat fault, and for a fault that contains a single
localized kink. We determine an exact expression for the partition between strain energy flow released
from the elastic medium surrounding the fault, radiated energy flow and energy release rate. This
balance depends only on the rupture speed and the residual stress intensity factor. When the fault
contains a kink, the energy available for fracture is reduced so that the rupture speed is reduced. When
rupture speed changes abruptly, the radiated energy flow also changes abruptly. As rupture propagates


Source: Ampuero, Jean Paul - Division of Geological and Planetary Sciences, California Institute of Technology


Collections: Geosciences