検潮観測による桜島の垂直変動

Abstract

For the purpose of continuous observations of the vertical displacement around Sakurazimaassociated with volcanic activities, in addition to the tidal station at the west coast, twotidal stations were newly established in March, 1976, at the east and the south coast ofSakurazima.Variations of the differences of daily mean sea levels between the south and the othercoast of Sakurazima were found to have periodic disturbances of two weeks with the amplitudeless than 4cm by the effect of the current between Kagoshima and Sakurazima.The value derived from the differences of monthly and yearly mean sea levels betweentwo tidal stations were compared with that of vertical displacements which were obtained bythe precise levellings. The value of vertical displacements obtained from tidal data almostcoincides with the result of precise levellings within the error of tidal observations.