Physics
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pepi..111..241r&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 111, Issue 3-4, p. 241-252.
Physics
4
Scientific paper
The dynamics of a block structure approximating an arc subduction zone, which is typical for regions of island arcs, was simulated numerically. The model used for simulation consists of absolutely rigid blocks separated by infinitely thin plane faults. Velocity vectors are specified to define the motion of the oceanic plate and the medium underlying the continent during the simulation. The interaction of the blocks along fault planes and with the underlying medium is viscous-elastic. When the ratio of the stress to the normal stress exceeds a certain strength level for some part of a fault, a stress-drop (`a failure') occurs in accordance with the laws of dry friction; it can cause failure in other parts of the same fault or within other faults. In the model, the failures represent earthquakes, so a synthetic earthquake catalog is produced. The computations, carried out with different dip angles of the subduction zone and directions of the movement of the oceanic plate, show that the seismic activity in the model is maximal when the dip angle of the subduction zone is about 40-50°. The synthetic seismicity migrates along the arc of the subduction zone.
Rundquist D. V.
Soloviev Alexander A.
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