Shear Wave Splitting Observed in the Southwestern Part of Fukushima Prefecture, Northeastern Japan

Tomomi Okada, Toru Matsuzawa, Satoshi Matsumoto, Koichi Nida, Akihiko Ito, Akira Hasegawa

研究成果: ジャーナルへの寄稿記事

9 引用 (Scopus)

抄録

We have investigated shear wave polarization anisotropy in the southwestern part of Fukushima Prefecture, northeastern Japan. Waveform data we analyzed are obtained by a local seismic networks of Tohoku University and Utsunomiya University. We used a cross correlation method to detect the shear wave splitting. For the shallow events beneath the southwestern part of Fukushima Prefecture, observed that fast shear wave oscillation directions (FSODs) are oriented to the NW-SE. The observed delay times are less than 0.1s and tend to have large values in high seismicity regions. For the intermediate-depth events, observed FSODs are oriented parallel to the dip direction of the subducted slab and most of the observed delay times are less than 1 s. We estimated the location and the cause of anisotropy based on these observations. In the upper crust beneath the southwestern part of Fukushima Prefecture anisotropy is estimated to be caused mainly by preferredly oriented cracks controlled by the tectonic stress.

元の言語英語
ページ(範囲)303-319
ページ数17
ジャーナルjournal of physics of the earth
42
発行部数4
DOI
出版物ステータス出版済み - 1 1 1994
外部発表Yes

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wave splitting
S-wave
anisotropy
oscillation
upper crust
seismicity
dip
slab
crack
polarization
tectonics

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

これを引用

Shear Wave Splitting Observed in the Southwestern Part of Fukushima Prefecture, Northeastern Japan. / Okada, Tomomi; Matsuzawa, Toru; Matsumoto, Satoshi; Nida, Koichi; Ito, Akihiko; Hasegawa, Akira.

:: journal of physics of the earth, 巻 42, 番号 4, 01.01.1994, p. 303-319.

研究成果: ジャーナルへの寄稿記事

Okada, Tomomi ; Matsuzawa, Toru ; Matsumoto, Satoshi ; Nida, Koichi ; Ito, Akihiko ; Hasegawa, Akira. / Shear Wave Splitting Observed in the Southwestern Part of Fukushima Prefecture, Northeastern Japan. :: journal of physics of the earth. 1994 ; 巻 42, 番号 4. pp. 303-319.
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AU - Matsumoto, Satoshi

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AU - Ito, Akihiko

AU - Hasegawa, Akira

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