Geoscience reports of Shimane University

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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
File
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.
NCID
AA11455176