Abstract
Surveys of the geomagnetic total intensity have repeatedly been carried out in the western part of Izu Peninsula about 100km southwest of Tokyo. One of the most remarkable changes in the total intensity seems to be associated with the Izu-Oshima Kinkai earthquake of magnitude 7.0 that occurred on January 14, 1978.The origin of the observed changes was investigated using a method to find an underground magnetic dipole corresponding to geomagnetic changes observed on the earth's surface. The result suggests that the origin of changes in total intensity during pre- and post-earthquake periods would be an increase of tectonic stress. On the other hand, the origin of changes associated with the earthquake occurrence is not likely to be directly associated with aftershock activity in the western part of Izu Peninsula but rather likely to have something to do with an effect of the main shock.
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