浅間山の火山活動の研究

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Volcanic earthquakes, volcanic smokes, state of crater, and other volcanic phenomena have been continuously observed since 1923 at Oiwake Volcano Observatory, located 7.6km SSE of the crater and at Karuizawa Weather Station, located 9.1km SE of the same crater. The volcanic earthquakes treated in this report were mainly recorded by seismograph of low magnification since 1923 at Oiwake Volcano Observatory. The volcanic smokes were observed since 1939 from Karuizawa Weather Station. In recent seismometrical investigation of Volcano Asama, the telerecording seismograph is used. Transducer, connected to the recorder at Oiwake Observatory with wire, is set at Chinotaki, situated at 3.75km SSE of the crater. This seismograph is adjusted to 6000 in magnification. The author treated the variation of probability of eruptions, the monthly numbers of earthquakes and tremors originating from the volcano, the probability of occurrence of enormous quantity of smoke and the explosion energies. It is pointed out that the Γ-distribution of the factors participating in the eruptions are often of normal distribution. The correlation between the eruptions and the monthly number of the earthquakes, and that between the eruptions and the quantity of the smoke are studied. It became clear that in the most case an increase of volcanic micro-earthquakes and a remarkable increase of smoke indicated a high probability of great eruption. However, during the active periods, the relation between the eruptions and the number of micro-earthquakes were not so marked.
特定非営利活動法人日本火山学会の論文
1961-06-30

浅間山の火山活動の研究

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