HR: 1330h
AN: S42D-0195    [PDF]
TI: The dynamic rupture process of the 2001 Geiyo, Japan, earthquake
AU: * Miyatake, T
EM: miyatake@eri.u-tokyo.ac.jp
AF: Earthquake Research Institute, University of Tokyo, Yayoi, 1-1-1, Bunkyo, Tokyo, 113-0032 Japan
AU: Yasuda, T
EM: tyasuda@eri.u-tokyo.ac.jp
AF: Earthquake Research Institute, University of Tokyo, Yayoi, 1-1-1, Bunkyo, Tokyo, 113-0032 Japan
AU: Yagi, Y
EM: yagi@kenken.go.jp
AF: IISEE, Building Research Institute, 1 Tachibara, Tsukuba, 305-0802 Japan
AB: Dynamic rupture simulation of the 2001 Geiyo earthquake (Mw = 6.7) was carried out based on the kinematic model. The space-time distribution of slip of the earthquake i.e., the kinematic mode, was investigated by inverting the nearfield strong ground motion data and teleseismic waveform data(Yagi and Kikuchi, 2001). Two asperities are identified. The rupture mainly propagated 20 km to the south. In constraint of the above source model, we have constructed a dynamic rupture model of the earthquake. In dynamic simulation, we used a fourth-order staggered-grid, finite-difference scheme to the three-dimensional equation of motion. Our scheme includes absorbing boundary conditions and the slip-weakening model on the fault plane. We assumed the slip weakening friction law. The initial model of the stress drop distribution was estimated by OkadaOs code imposing the kinematic slip distribution on the fault. Assuming the above stress drop, a uniform Dc and then kinematic rupture time distribution on the fault, dynamic simulation was carried out. The final slip, the rupture process, moment rate time function are used to adjust the dynamic parameters. The distribution of Dc was estimated by using peak value of inverted slip rate time function (Mikumo et.al., 2003). We applied this heterogeneous Dc model to dynamic simulation. The dynamic rupture with heterogeneous Dc distribution generate rupture history, final slip distribution, moment rate time function that approximately matched those determined by the kinematic inversion.
DE: 7209 Earthquake dynamics and mechanics
SC: Seismology [S]
MN: 2003 Fall Meeting