Abstract
Geomagnetic works have been conducted on Volcano Mihara since its great eruption in 1950. As a result of repeated magnetic surveys marked changes in the geomagnetic field have been found. A continuous recording also proves the occurrence of anomalous changes in geomagnetic declination in connection with development and subsidence of the volcanic activity. It seems likely that the main parts of the geomagnetic changes thus found are caused by the demagnetization and magnetization within the volcano, which is composed of basaltic rocks containing a large amount of magnetite. Geomagnetic studies will be useful for inferring the internal state of certain volcanoes and sometimes even for the prediction of their eruptions.
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