Three Dimensional Seismic Velocity Structure beneath the Otake-Hatchobaru Geothermal Area at Kuju Volcano in Central Kyushu, Japan
| Autor: | YOSHIKAWA, Miyuki, SUDO, Yasuaki |
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| Jazyk: | japonština |
| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | 京都大学防災研究所年報. B. 47:779-784 |
| ISSN: | 0386-412X |
| Popis: | 大岳･八丁原地域の深部地熱構造について地震波速度構造と地震活動からの検討をおこなった。その結果，大岳･八丁原地域の深さ1kmにおいてlow Vp and Vs領域がみられた。Low Vp and Vs領域の下部，深さ3.5kmには基盤岩を示すと考えられるhigh Vs領域が分布し, Vp/Vsはlowを示した。この下，深さ5kmから8kmにかけてはlow Vs領域が大岳･八丁原地熱地域から南西の黒川地熱地域まで分布する。火山地域においてLow Vs領域はしばしば古いマグマと関係づけられ，この場合も同様のことが示唆される。 We studied the three-dimensional seismic velocity structure of the Otake-Hatchobarugeothermal area in central Kyushu, Japan, using the tomographic method of Zhao et al. (1994).As a result of that, we could find a velocity structure imaging a geothermal structure of thearea. A low Vs and low Vp/Vs region relating to the old magma body of volcanoes around ofthe geothermal area was located at the depth deepter than 5 km. At the upper part of this lowanomalous region, the high Vs and low Vp/Vs region (Z=3.5 km depth) showing the graniticbasement rock was found. There were low Vp and Vs regions at 1 km depth over the high Vsregion, which were associated with a volcanic deposite zone and a fracture zone at this area. |
| Databáze: | OpenAIRE |
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