桜島火山の地殻変動について (1)

Abstract

The vertical crustal movement of Sakurajima Volcano associated with volcanic activity, especially with summit eruptions, was examined on the basis of the results of tidal observation andprecise levelling. The following results were obtained.(1) In the periods of high volcanic activity, the whole ground of Sakurajima Volcano was up-lifted. On the other hand, the northern coast, which is near to the center of the Aira caldera, was uplifted and the southern coast was depressed in the period of low activity.(2) The variation of the relative height in the southern part of the Sakurajima Volcano, whichis near to the active crater, is more sensitive to the change of the volcanic activity than inthe northern part.