The 6th seismic experiment of national research project for volcano eruptions was done successfully at Izu-Oshima Volcano during 27 October - 5 November 1999. The purpose of the experiment is to clarify the subsurface structure of the volcano including the location of magma reservoir, and to understand the magma feeding system and its temporal change. Survey lines and 2-dimensional arrays cover about 160 and 60 seimometers, respectively.
More than fifty scientists from national universities and Japan Meteorological Agency joined the experiment. This time, dynamite and air-gun shots and observation by OBS's in the sea were also included; jointly with the national university group of earthquake predition researches in the sea-area.
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