81011308

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SHALLOW DIP-SLIP EARTHQUAKE: ITS DYNAMICS AND THE GENERATION OF THE CORNER WAVE

神戸大学都市安全研究センター研究報告

14

13-22

神戸大学都市安全研究センター

2010-03

2019-05-30

Dynamic simulations of the seismic wave field radiated by rupture of a dip-slip fault located near Earth's free surface indicate, when the rupture front approaches the surface, four relatively strong Rayleigh-type pulses are generated: two propagating along the free surface into the opposite directions to the far-field; the other two moving back along the ruptured fault surfaces (interface) downwards into depth. If the fault is nonvertical and the geometrical symmetry is broken, in the hanging wall, the downward interface pulse interacts with the outward-moving Rayleigh surface pulse and induces a kind of shear wave (cornerwave). This corner wave carries concentrated wave energy and generates strong particle motions in the hanging wall, thus causing asymmetric ground motion. The generation of the interface pulse and the corner wave has not beenwell recognized so far, partly because those waves are not expected for a fault rupturing at depth.

computational seismolog

紀要論文