HR: 1340h
AN: S13A-1050    [Abstracts]
TI: Tsunami Waveform Modeling Of The 2007 Solomon Earthquake
AU: * Namegaya, Y
EM: yuichi.namegaya@aist.go.jp
AF: Geological Survey of Japan, AIST, Central 7, Higashi 1-1-1, Tsukuba, Iba 305-8567, Japan
AU: Tanioka, Y
EM: tanioka@mail.sci.hokudai.ac.jp
AF: Institute of Seismology and Volcanology, Hokkaido University, kita 10, Nishi 8, Sapporo, Hok 060-0810, Japan
AU: Satake, K
EM: kenji.satake@aist.go.jp
AF: Geological Survey of Japan, AIST, Central 7, Higashi 1-1-1, Tsukuba, Iba 305-8567, Japan
AB: On 20:40(UTC) April 1st, 2007, a large earthquake (M 8.1) occurred off the south coast of Solomon Islands, and accompanied with tsunami and crustal deformation. The tsunami was recorded at many tide gauge stations in the Pacific Ocean with amplitudes of several to ten and several cm. Tanioka et al. (AGU 2007) proposed a suitable fault model that explains the crustal deformation data obtained by the field survey (Nishimura et al., AGU 2007). The assumed fault is located between Simbo Island and Gizo Island, and its length, width and slip are 100 km, 35 km and 7.5 m, respectively. However the fault size cannot be constrained from the crustal deformation, because most of the fault plane is located in the ocean. In order to examine whether the assumed fault model can explain the observed tsunami, we carried out the tsunami numerical simulation and compared the observed and calculated waveforms in Solomon, Vanuatu, and Australia. The governing equations in the simulation are linear long wave equations in the spherical coordinate system, and the Coriolis effect and the bottom friction are ignored. The calculated tsunami waveforms from the proposed model are similar to the observed ones, in terms of the arrival time, amplitude, and waveform of the first cycle or two. [Acknowledgement] We appreciated the Bureau of Meteorology, Australian government for providing us the tide gauge records.
DE: 3040 Plate tectonics (8150, 8155, 8157, 8158)
DE: 4546 Nearshore processes
DE: 7209 Earthquake dynamics (1242)
DE: 7240 Subduction zones (1207, 1219, 1240)
DE: 8150 Plate boundary: general (3040)
SC: Seismology [S]
MN: 2007 Fall Meeting