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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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