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タイトル: 九州東部の人工地震観測から推定された地殻構造
その他のタイトル: Crustal structure beneath eastern Kyushu, Japan, derived from a wide-angle reflection and refraction experiment
著者: 安藤, 誠
森谷, 武男
岩崎, 貴哉
武田, 哲也
朴, 成実
酒井, 慎一
飯高, 隆
久保, 篤規
宮町, 宏樹
田代, 勝也
松島, 健
鈴木, 貞臣
著者(別言語): Ando, Makoto
Moriya, Takeo
Iwasaki, Takaya
Takeda, Tetsuya
Piao, Chengshi
Sakai, Shin'ichi
Iidaka, Takashi
Kubo, Atsuki
Miyamachi, Hiroki
Tashiro, Katsuya
Matsushima, Takeshi
Suzuki, Sadaomi
キーワード: refraction exploration
crustal structure
accretion sediments
Kyusyu
発行日: 2003年1月31日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第77冊第3号, 2003.1.31, pp. 277-285
抄録: In 1994 and 1996, seismic refraction experiments were executed in the eastern part of Kyushu, Japan, he target of the experiments was to investigate the crustal structure composed of accretion materials associated with the paleo subduction process. The experiment in 1994 was composed of 3 shots, 195 observation stes, and 195 km measurement line. In the 1996 experiment, there were 3 shots, 236 observation sites, and 228 km measurement line, which extended north. Observation sensors were set at the same places except for the extended line of the second experiment. To establish a P wave crustal structure model, ray-trace forward modeling and inversion technique were used. The final P wave velocity structure model shows that the upper crust is composed of four layers: two sedimentary layers with velocities of 3-4 and 4-5km/s, basement layer, 5.2-5.8 km/s and granitic layer, 6 km/s. The sedimentary layers developed in the southern part of the profile, which corresponds to the North and South Shimant belts. The thickness of the sedimentary layers in the Southern Shimant belt, exceeds 4 km. The basement layer has a complicated form. We found two distinct irregularly folded parts of the basement layer beneath Shimant belts and an abrupt decrease of the amplitudes of seismic waves that pass through beneath those parts. We interpreted the sedimentary layers had developed under a subduction process in Cretaceous (Izanagi plate) and Tertiary (Pacific plate), and the 6 km/s layer rising beneath the Shimant belt might correspond to an under-plating fragment of a plateau.
URI: http://hdl.handle.net/2261/13256
ISSN: 00408972
出現カテゴリ:東京大学地震研究所彙報
東京大学地震研究所彙報

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