Electromagnetic Observations in Sea and Land to Image Resistivity Structure beneath the Back-Arc Region of Southwest Japan

Autor: OSHIMAN, Naoto, TOH, Hiroaki, KASAYA, Takafumi, SHIOZAKI, Ichiro, SHIMOIZUMI, Masashi, YOSHIMURA, Ryokei, SHINGAI, Masafumi, FUJII, Ikuko, YAMAGUCHI, Satoru, NAKAO, Setsuro, MURAKAMI, Hideki, YAMAZAKI, Akira, YABE, Sei, TAKAHASHI, Kousuke, MORIYAMA, Takashi, MASHIKO, Norimichi, SHIMIZU, Junpei, MINAMOTO, Yasuhiro, OWADA, Takeshi, TOYODOME, Shuichi, IWASE, Yuki, UYESHIMA, Makoto, NISHIYAMA, Yoko, SHINMURA, Kanako, KAKOI, Yusuke, HIRANO, Yuki, SUGIYAMA, Daisuke, TORIKOSHI, Kouichiro, ITO, Yousuke, TAMAI, Shintaro, MOCHIDO, Yuji, TAKAGI, Yu, MINAMI, Takuto, MARUYA, Yoshihiro, KUDEN, Hiroki, HIMENO, Kouichiro, YASUMATSU, Junji, TAKEDA, Kazuya, YAMAMOTO, Yuji, USUI, Yoshiya, TERAMOTO, Mariko, NISHIMURA, Kazuhiro, MIURA, Tsutomu
Jazyk: japonština
Rok vydání: 2010
Předmět:
Zdroj: 京都大学防災研究所年報. B. 53:181-190
ISSN: 0386-412X
Popis: 山陰地方の陸域と海域を含む西南日本背弧の地殻・マントル比抵抗構造モデルを構築するために， 2006年から海域・陸域での観測を連携させたMT観測を開始し，主に次の2本の測線に沿った観測を実施してきた。1) 鳥取・兵庫両県境付近沖の海域を含む測線(Profile SW100)と，2) 隠岐諸島周辺海域を含む測線(Profile SW200)である。これらの測線に沿って，海域では海底磁力電位差計(OBEM)，および海底地電位差計(OBE)を用いた観測を，また，陸域においては，広帯域MT観測，長周期MT観測を併用した観測を実施してきた。本報告では，2006年から2009年にかけて実施した，日本海での海底観測と，海底観測と連携した陸域での観測の概要と解析結果の概要を報告する。
In the San-in region, Japan (the Tottori and surrounding region in the northern part of Chugoku district, southwestern Japan), epicenters of seismic activities are distributing within a line belt with a width of about 4-9 km along the coastal line of the Sea of Japan. In order to investigate deep resistivity structure beneath the seismic belt and clarify the relationship between subducting Philippine Sea plate and the deeper resistivity structure beneath the San-in region, we have carried out not only seafloor EM measurements using OBEM and OBE but also longer period MT surveys on land since 2006 along two profiles, SW100 and SW200 passing through almost N-S lines of longitudes, 134.3E and 133.4E, respectively. We report the outline of the measurements in the region of sea and land beneath the San-in region, and preliminary results of the data analysis in this manuscript.
Databáze: OpenAIRE
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