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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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