Numerical modelling of earthquake flow in the southeastern Carpathians (Vrancea): effect of a sinking slab

Details Numerical modelling of earthquake flow in the southeastern Carpathians (Vrancea): effect of a sinking slab Numerical modelling of earthquake flow in the southeastern Carpathians (Vrancea): effect of a sinking slab

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pepi..111..267i&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 111, Issue 3-4, p. 267-274.

Physics

8

Scientific paper

The earthquake-prone Vrancea region is modelled as a system of perfectly rigid blocks separated by infinitely thin plane faults. The interaction of the blocks along the fault planes and with the surrounding medium is assumed to be a viscous-elastic. The displacements of the block system are caused by motions of boundary blocks. The velocities of the motions are found from a model of mantle flows induced by a sinking slab beneath the Vrancea region. When a ratio of stress to pressure for some portion of a fault plane exceeds a certain strength level, a stress-drop (`earthquake') occurs. As a result of the numerical simulation a catalog of synthetic earthquakes is produced. Several numerical experiments for various model parameters show that the spatial distribution of synthetic events is significantly sensitive to the directions of the block movements. Small variations in a slab rotation control the pattern of the synthetic seismicity. The results of the analysis show that the catalogs obtained by the simulation of the block structure dynamics have certain features similar to those of the real earthquake catalog of the Vrancea region.

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