Three-dimensional image of conduit
drilling. Shown inside the volcano
are the drilling trajectory of conduit drilling
(USDP-4) and plate-shaped conduit (dike) together
with earthquake hypocenters, water table
and explosion source.
Photograph showing four USDP drilling sites on the
eastern side of Unzen volcano. In July
2002, road construction to the drilling site
to the conduit (USDP-4) started in the northern
slope of Mt. Fugen (peak of Unzen).
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questions to S. Nakada.
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Institute, University of Tokyo (Japan)
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