著者
横尾 亮彦 市原 美恵 谷口 宏充
出版者
特定非営利活動法人 日本火山学会
雑誌
火山 (ISSN:04534360)
巻号頁・発行日
vol.49, no.5, pp.299-304, 2004-10-29 (Released:2017-03-20)
参考文献数
24
被引用文献数
1

Izu-Oshima volcano, one of the most active volcanoes in Japan, started a series of emotions on Nov. 15, 1986. One of the characters of the e ructions is the small-scale explosions with flashing arcs, which were the visualized shock waves as a phase change of H2O in the air. occurred at the summit lava-lake. The flashing arcs, seen on the movie, show several characteristics; 1) they spread and propagate semi-spherically, and 2) the launching of semi-spherical ballistics follows the flashing arcs. Analysis of the movie indicates that the velocities of flashing arcs were 300-440 m/s and their sources were located almost on the surface of the lava-lake. We paid attention to the ballistics in the light of scaling laws, which were established from field explosion experiments, so that we were able to estimate explosion energy as about 8×109J. Additionally, assuming that the flashing arcs were produced by an explosion, such as a bursting of pressurized-bubbles, we could get information of their condition, a relationship between inner-pressure and the size.

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https://t.co/Vb05A675PU “flashing arc”というより”visible shock wave”と称されることが多いとのこと 大気重力波の理解とは異なる雲形成のあり方として面白いなって思った(小並感) https://t.co/1tjWaBJbXr
伊豆大島1986年噴火における光環現象 横尾 亮彦1), 市原 美恵2), 谷口 宏充3) 1) 東北大学大学院理学研究科地学 2) 東北大学東北アジア研究センター:(現)東京大学地震研究所海半球研究センター 3) 東北大学東北ア… https://t.co/Fex1WnqdfA

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