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| | Abstract | | Volcanic condition of Akita-Komagatake volcano after the eruption of 1970 has been monitored by geophysical methods. As one of them gravity observation has been made repeatedly at fixed points since 1977. Remarkable gravity variation was observed at the top and side of the Medake which is the central cone with the 1970 crater. The gravity increased with decay of thermal activity in the Medake area from 1977 to 1998, and then has changed to tendency of decrease with reactivation of the thermal activity for the last several years. The gravity variation in the respective stages is interpreted to be caused mainly by uplift and subsidence of the ground surface. |
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