栗駒火山における地震観測

概要

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Mt. Kurikoma is an active volcano located nearly at the center of the northeastern part of Honshu, Japan. The activity of this volcano has been very low in the last decade, and we have few geophysical data about this volcano. The seismic observation was carried out at Mt. Kurikoma in August and September, 1971 in order to know the seismic activity of this volcano and surrounding area in the quiet period. The hypocenters of sixteen earthquakes observed with a tripartite network were determined under a reasonable assumption of crustal structure. Besides these events, thirty epicenters were estimated from P∿S times at Mt. Kurikoma and at several observatories of Tohoku University. Some seismic activity beneath and near Mt. Kurikoma was found separately from the aftershocks of an earthquake, which occurred in the southeastern part of Akita Prefecture on October 16, 1970. The activity has a tendency of successive occurrence. The daily number of events is 0.7 on an average except for the period of group occurrence. The seismic activity, even including the aftershocks, is limited within the region under the central mountain range.
1972-12-01