Physics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20...89t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 2, p. 89-92.
Physics
5
Overpressure, Pressure Measurement, Volcanoes, Blasts, Earthquakes, Explosions, Japan
Scientific paper
Over pressure of a volcanic blast has been measured for the first time by a lead-plate blastmeter at Unzen Volcano, Kyushu, Japan. The overpressure of the volcanic blast on June 8 was 0.28 bar at 2700 m distance from the crater, and that was less than 0.06 bar at 4400 m distance. The estimated explosive yield of the explosion accompanied by the blast was 1.1 x 10 exp 7 kg TNT (5 x 10 exp 20 erg) calculated based on the over pressure and distribution of the blast effect. The explosion energy is as much as 1/600 of that of the blast at Mount St. Helens on 18 May 1980. The lead-plate of the blastmeter at 2700 m has also recorded the collision with some accretionary lapillis. The maximum particle velocity of the blast was estimated to be about 75 m/sec based on the trace of the collision. The significance of over pressure for the prediction of volcanic hazards is also discussed briefly.
Suzuki-Kamata Keiko
Taniguchi Hiromitsu
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