Changes of Earth-Current Potentials at Kanoya and Activities of Volcano Sakurajima
Yoshimatsu, T.
Abstract
Abnormal changes of the monthly mean values of earth-current potentials observed at Kanoya, Kagoshima Prefecture, were examined in studying the relation to the activity of the volcano Sakurajima, about 27 km apart northwest of Kanoya, of which latest moderate eruption occurred on October 13, 1955 and was followed by many minor volcanic eruptions and microtremors up to the middle of March in 1957.
It was found that the deduced value of earth potentials, f(t) =ΔN−ΔN+αP, shows an intimate connection with the volcanic activity which may be responsible for the changes of the state of magma in deeper part of the volcano, where ΔN is the deviation for each month from the general linear trend assumed of the monthly mean values, ΔN the mean value of ΔN in the calm period of the volcanic activity 1952-54,P the monthly total number of microtremors, and α a constant.
Corrigenda is attached to this text.
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