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タイトル: 屈折法地震探査によって見いだされた地殻中間層 : 地震学的性質と温度分布
その他のタイトル: Intermediate Crustal Layer beneath Active Japanese Island arc and a comparison of seismological characteristics with thermal distribution
著者: 森谷, 武男
岩崎, 貴哉
オウズ, オゼル
酒井, 慎一
武田, 哲也
大塚, 建
吉井, 敏尅
伊藤, 潔
伊東, 明彦
田中, 明子
大久保, 邦泰
著者(別言語): Moriya, Takeo
Iwasaki, Takaya
Ozel, Oguz
Sakai, Shin'ichi
Takeda, Tetsuya
Otsuka, Ken
Yoshii, Toshikatsu
Kiyoshi, Ito
Ito, Akihiko
Tanaka, Akiko
Okubo, Kuniyasu
キーワード: crust
velocity structure
intermediate crustal layer
wide angle reflection and refraction
thermal structure
発行日: 2001年7月25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76冊第1号, 2001.7.25, pp. 105-114
抄録: From results of deep seismic profiling conducted by RGES (Research group for explosion seismology) in the past decade, we found intermediate crustal layers with P-wave velocity of 6.3-6.4 km/s, between upper and lower crustal layers. The intermediate layers (ICL) lie just beneath the volcanic front of Hokkaido, Tohoku, and Northern Kanto. The record sections of the wide-angle reflections show that the ICL seems to have a reflective structure, but reflectivity is not as strong as that of the lower crust. The temperature of the upper surface of the ICL was estimated from geothermal gradient data compiled by Japan Geological Survey of Japan. We found that the temperature of the upper surface of the ICL is about 500℃, which is almost the same as that of the lower crust. The intermediate layer was not found beneath non-volcanic western Honshu. We interpreted this to mean that the intermediate layer is composed of transient materials in which mafic materials change into felsic materials due to magma and hydrothermal processes. By discovering ICL, more substantial problems related to the formation and the development of the island arc crust may be suggested.
URI: http://hdl.handle.net/2261/13208
ISSN: 00408972


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