島根大学総合理工学部地球資源環境学教室
ISSN:1343-9774
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Use this link to cite this item : https://ir.lib.shimane-u.ac.jp/3263
Geoscience reports of Shimane University 19
2000-12-25 発行
雲仙火山地域の重力異常
Gravity ammaly in the Unzen volcanic area,Kyushu,Japan
Komuro, Hiroaki
Shichi, Ryuichi
Shitama, Youji
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Description
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．
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．
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