5 - 8 Underground structure of Kyushu Island
observed with electric conductivity

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Electric conductivity (in units of S(Siemens)/m) is a quantity to show how easy to conduct electricity. If the rock constituting the crust or mantle contains a lot of water, or if a part of the rock is melted, then its electric conductivity would be large.
As seen in Figure below, a region with large electric conductivity exists in the upper mantle under the western sea of the northern Kyushu area. This region seems "hot" and a part of it might be melted. The lower crust just beneath Unzen Volcano is of large electric conductivity and this also seems "hot" and melted.

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