Photos on December 6, 1999

The main hole at the Minami-Senbongi district, Shimbara City (December 6, 1999). Rig will stand on this hole in Januray 2000. Backgroud is the lava dome of the 1991-95 eruption.

Drilling tools used for coring in the shallow levels. Small holes on the side just above the pipe head are designed for water inlet. Inner diameter of the pipe head is about 6.5 cm (=core diameter).

Cores from the 103-105 m depth. Dacite (plagioclase and hornblende phyric) lava block (?) underlies a mud layer. The recovery of rocks (sand and gravel) near the surface is much higher than 80 %!!


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