HR: 1340h
AN: S43B-1304 [Abstracts]
TI: Application of Seismic Interferometry to Natural Earthquake Records
AU: * Torii, K
EM: torii@earth.kumst.kyoto-u.ac.jp
AF: Kyoto University Faculty of Engineering, Room 118, C-1 cluster, Katsura Campus Kyoto
Daigaku, Kyoto, 615-8530, Japan
AU: Matsuoka, T
EM: matsuoka@earth.kumst.kyoto-u.ac.jp
AF: Kyoto University Faculty of Engineering, Room 109, C-1 cluster, Katsura Campus Kyoto
Daigaku, Kyoto, 615-8530, Japan
AU: Aizawa, T
EM: aizawa@suncoh.co.jp
AF: Suncoh Consultants Co., Ltd., 1-8-9, Kameido Koto-ku, Tokyo, 136-8522, Japan
AB:
Recently, seismic interferometry has been one of the hottest topics in the exploration geophysics since this can
be applied to reflection seismology. Seismic interferometry constructs Greenfs functions between arbitrary two
points by taking cross-correlation of records observed at two locations. These Green's functions correspond to
the wavefields as if an impulsive source was set at one location and seismic wave propagates from this source
to the other receiver. Therefore, if we chose two surface receivers, we can reconstruct reflection seismic data. In
case of using many receivers in a survey line, taking cross-correlation of all observed data at receivers generates
pseudo shot-gather data for arbitrary locations. This technique does not need information of time 0 as long as all
receivers measure wavefields synchronously. Therefore, there is no limitation with regard to the cause of the
seismic vibrations. Natural earthquakes may be very good seismic sources for seismic interferometry.
In our study, we adopt data provided by Hi-net system for applications of seismic interferometry. In 1995, gThe
Great Hanshin Earthquakeh struck around Osaka and Kobe in Japan. After that, Japanese Government decided
to construct high-density and high-sensitivity sensor network all over Japan in order to accumulate effective
information of earthquakes and understand the mechanism of earthquakes. This seismic network is called gHi-
net systemh in Japan. Hi-net system provides us much effective information, origin time, epicenter, depth,
magnitude and waveform, etcc We used waveforms provided by Hi-net and generated pseudo shot-gather data
by using seismic interferometry. Then, we applied these data to conventional reflection survey and analyzed
underground structures in Japan.
DE: 0910 Data processing
DE: 0935 Seismic methods (3025, 7294)
DE: 1734 Seismology
DE: 7212 Earthquake ground motions and engineering seismology
SC: Seismology [S]
MN: 2007 Fall Meeting