火山活動と地震発生 : 1983:サイスミシティ・ヴォルカニズム(V)

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概要

• 論文の詳細を見る

• On the basis of the seismic observation records (Geophysics Division, D.S.I.R.), the writer attemted to reveal the whole aspect of the Wairakei-Taupo, Raoul Earthquake swarms, and tried to exclain the mechanism of earthquakes generation by referring to the earthquake swarms of volcanic and non-volcanic origin hitherto recorded in Japan. The latest example of earthquake swarm is that of Japan. The latest example of earthquake swarm is that of Matsushiro, Miyakejima (1983), on which great quantities of data have been accumulated. So, the writer chiefly used the Matsushiro data, supplemented by the past records and results of great earthquakes. N(I・day), in numerous earthquake swarms of volcanic origin Four characteristic stages have been discriminated. With the commencement of the earthquake swarm, N increasses but it eventually comes to show a decreas; this is the first stage. In the second stage; N shows a sudden increase a forms the first peak, however after that it attenuates with N=K(T+C_0)^<-pt>. Then, N increases gradually and forms second peak, in a symmetrical shape. This is the third stage. After that, N keeps on monotonously until termination of the activity; this is the fourth stage. The surface phenomena, such as eruption, lava flow and displacment of ground,are ovserved after the appearance of the first peak. In the case of the Matsushiro earthquake swarm. ground displacement was observed but pretrusion of magma onto the ground surface did not take place. Instead of volcanic eruption, a large amount of cold water gushed out of the epicentral area, and this phenomenon marked the termination of the activity. In the case of the Wairakei-Taupo earthquake swarm, too, no protrusion of magma on the ground surface was observed, and so it is presumed that the under ground strain energy was released in the form of effusion of the subsurface water (water of the Taupo also).

• 駒澤大学の論文

著者

• 木澤 綏

  駒澤大学文学部

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• 火山活動と地震発生 : 1983:サイスミシティ・ヴォルカニズム(V)

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