著者

半田 駿

出版者

東京大学地震研究所

雑誌

東京大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.73, no.3/4, pp.345-359, 1999-03-29

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The MT survey was conducted to clarify the lower crustal resistivity structure beneath the volcanoes of Tsurumi- and Yufu-Dake in central Kyushu, SW Japan. The 2-D resistivity model obtained reveals that the highly resistive lower crust lies under highly conductive layers with a thickness of about 3 km at a shallow part of the crust. Since the resistive lower crust is also found in the Aso Volcano area, the present result implies that the lower crust is commonly resistive beneath volcanoes of the volcanic front in central Kyushu, while conductive layers are found at the middle and lower crust beneath the volcanic zone in many subduction zones, as seen in NE Japan.