Finding Underground Magma
Finding Underground Magma
Geologist Tom Wright is rolling out a long wire (carried in a heavy and
uncomfortable spool on his back). A small current will be run through
this wire and it will send an electrical signal into the ground. The
return signal will be different depending on the temperature of the
sub-surface, and this technique is sometimes used to try and find
underground bodies of magma. This photo was taken in 1987 and you can see
how much vegetation can grow in 10 years.
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