Flashing Arc on lzu-Oshima 1986 Eruption

DOI Web Site 1 Citations 24 References
  • YOKOO Akihiko
    Institute of Mineralogy, Petrology and Economic Geology, Graduate School of Science, Tohoku University
  • ICHIHARA Mie
    Center for Northeast Asian Studies, Tohoku University:(Present address)Earthquake Research Institute, University of Tokyo
  • TANIGUCHI Hiromitsu
    Center for Northeast Asian Studies, Tohoku University

Bibliographic Information

Other Title
  • 伊豆大島1986年噴火における光環現象
  • イズ オオシマ 1986ネン フンカ ニ オケル コウカン ゲンショウ

Search this article

Abstract

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.

Journal

Citations (1)*help

See more

References(24)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top