Abnormal Variations of Earth-current Potentials accompanied with an Earthquake occurred in the Kii-straits on Jan. 12th, 1938

Abstract

Abnormal variations mentioned in the title were recorded by using a specially designed differential galvanometer, and the records were compared with the abnormal variations calculated by the method described in my previous paper; and the coincidence between them was satisfactorily good.
The abrupt changes in the direction of current were calculated from the records obtained by the instruments reported in my previous paper and the component of direction due to the abrupt changes was directed towards the epicenter.