著者

小室 裕明 志知 竜一 舌間 洋二

出版者

島根大学

雑誌

島根大学地球資源環境学研究報告 (ISSN:13439774)

巻号頁・発行日

vol.19, pp.97-100, 2000-12-25

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A Bouguer gravity anomaly map of the Unzen volcanic area founded on 590 gravity stations suggests the following volcanic structures:1.The gravitational Unzen graben shows a linear north rim along the Chijiwa fault.However,the gravitational south rim does not coincide with the Futsu fault which is the topographical south rim of the Unzen graben.2.The source of a low gravity anomaly in Tachibana-wan Bay has been considered as mass deficiency of caldera origin,but it may in fact be due to the emplacement of a large magma body.