Hiroyuki Tanaka of the University of Tokyo

Hiroyuki Tanaka of the University of Tokyo reasoned that the throat could be “x-rayed” with energetic muons produced in cosmic-ray showers. The number of muons passing through the volcano would depend on the density of intervening rock, so measuring the number of muons passing through various parts of the volcano could yield a crude, 3-D view of the interior.

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