Author(s): Kuniaki Miyamoto; Masanori Michiue; Tetsuya Kubota
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Keywords: Huge sediment disaster; Huge waves; Landslide; Mayuyama disaster
Abstract: In this study, a huge sediment disaster due to the landslide was discussed. In order to prevent this kind of disaster, the prediction of the time and the position of occurrence and the scale of the landslide are required. In addition to this, it is also important to consider the behavior of the landslide. In this paper, Mayuyama disaster in 1792, which is one of the largest disasters caused by landslide due to volcanic activity in the world, is introduced. The topography of the Mt. Mayuyama before failure was reconstructed and mechanism of failure of the Mt. Mayuyama was discussed. A numerical simulation model to reproduce the landslide process has been developed and applied to Mayuyama disaster. As the result, followings are obtained. (1) The volume of Mayuyama landslide is about 120-150 millions m 3 (2) Present topograph of the Mt. Mayuyama agree with the slip surfase obtained from CSSDP analysis (3) The landslide body is stable, but during earthquake it can’t be stabilized and start to move. (4) The velocity and thickness of the landslide front when it was just about reaching at shoreline of Ariake bay is estimated about 100m/s and 30m, respectively (5) The landslide body is considered to be fully fluidized on the bases of various calculations. The methodology in this study is applicable to the future possible event like the Mayuyama disaster, and it will give us useful information about the possibility of occurrence and the behavior of a landslide.
Year: 1999