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Abstract. Geomagnetic depth soundings have been made in the area covering Kyushu island and its neighboring islands in the western sea of Kyushu to investigate the back-arc conductivity structure. The in-phase induction arrows derived from geomagnetic variations are found to point roughly southwestwards at most sites on Kyushu island for the period range 300-7200 sec. This is quite different from some other areas of Japan.

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