Session IV:
Simulation of earthquake repture, wave propagation and standard models for different tectonic settings

2nd ACES (APEC Cooperation for Earthquake Simulation) Workshop in Japan

Dynamics of shallow reverse faulting in 2D
Raul Madariaga


A number of authors have recently simulated shallow reverse and normal faulting.Oglesby et al (1997,2000)have in particular noticed that the e ects of the free surface on strong motion and rupture are much more important than previously thought.They attributed these e ects to a "break in symmetry" due to the local stress eld near the surface.Brune and colleagues (Brune and Anooshepor,1998;Shi et al,1998) have carried a set of experiments on a foam rubber model of a reverse fault and modelled it using a 2D lattice model. They found, among other things, that ruptures in the foam rubber model tended to produce an opening of the fault near the surface of the foam rubber specimen. This opening completely releases compressive strains reducing friction and producing non-linear deformation of the hanging wall. Brune (personal communication,2000)has also found that the moment release measured directly from the foam rubber experiment doe not match the moment computed by traditional seismological methods.

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