Establishment of the scaling rule for explosive eruption and its application to the estimation of hazard distribution

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This research work intends to establish the scaling rule that relates the explosion energy and depth of volcanic explosion to the extension and strength of volcanic disaster such as volcanic blast wave, pyroclastic surge and ballistic fragment.For this purpose, we made some field explosion experiments under both of the conditions on the dry ground and in water. These two years we have concentrated on the underwater experiment for getting the understanding of submarine eruption. The main points of observation accompanied to the experiments are as follows :1.Observation of underwater pressure waves using blast-sensor and underwater microphone2.Observation of shock wave in the air using blast sensor and high-speed video recorder3.Observations of water-dome and ballistic fragment usnig visible and infra-red video recorders4.Simultaneous recording of eqrthquake, air wave and visible image of the explosionThe weigh of explosives used (Kiri-dynamite) were ranged from 250g to 4000g, adn the scaled depth ranged from 0 to 2.15 m/g^1/3.Based on these experiments, weconvinced that the scaling rule for underwater volcanic eruption could be also establishd as in the case on dry ground.