著者
早川 由紀夫
出版者
Japan Association for Quaternary Research
雑誌
第四紀研究 (ISSN:04182642)
巻号頁・発行日
vol.30, no.5, pp.391-398, 1991-12-25 (Released:2009-08-21)
参考文献数
24
被引用文献数
11 5

Tephra provide extremely useful sedimentary beds for Quaternary research because they are highly reliable time markers. Tephra studies in Japan have advanced primarily on this basis. Because tephra themselves are products of volcanic eruptions it is quite possible to study explosive eruptions using tephra beds. The thickness of the beds tells us the magnitude of the eruption, while the dispersal pattern of the tephra tells us the intensity of the eruption. The mode of eruption is known by the grain-size characteristics of the tephra deposits. The life history of a volcano can be revealed by alternations of tephra and loess beds.

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噴煙柱の高さHは熱エネルギー放出率Qの1/4乗に比例し、定常状態の噴煙の場合はH=8.2Q^1/4の関係が成り立つらしい。タール火山の噴煙柱の高さは約17kmとの事なので熱エネルギー放出率は1.8^13W。これは広島型原爆の1/3… https://t.co/RFjs0i0JrL

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