UTokyo Repository 東京大学

UTokyo Repository >
131 地震研究所 >
東京大学地震研究所彙報 >

このページ(論文)をリンクする場合は次のURLを使用してください: http://hdl.handle.net/2261/12741

タイトル: 津波の規模階級とエネルギーとの関係
その他のタイトル: Relation between Tsunami Magnitude and Wave Energy
著者: 羽鳥, 徳太郎
著者(別言語): Hatori, Tokutaro
発行日: 1980年3月31日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第54冊第3号, 1980.3.31, pp. 531-541
抄録: Based on the attenuation of the maximum wave height with the distance along the continental shelf from the earthquake epicenter, the tsunami magnitude of Imamura-Iida scale, m, are determined. According to the present method of making use of far-field tsunami waves observed by many tide gauges, the tsunami magnitude can be estimated within the accuracy of about ±0.5. For example, the tsunami magnitude of the 1960 Chile tsunami is the largest where m=4.5. The 1952 Kamchatka and the 1964 Alaska tsunamis are m=4. Using the data of the seismic fault model analyzed from the observed tsunami waves and the crustal deformation of the ocean floor, the relation between tsunami energy Et and tsunami magnitude m is expressed as log Et=0.7m+19.1. The tsunami energy is reduced by one-fifth with the decrease of magnitude in unity. The potential energy is the order of 1021 ergs for large tsunami (m=3) and of 1013 ergs for small tsunami (m=-1). The average vertical displacement in a tsunami source, estimated by using the tsunami energy and the source area, is 1 to 1.5 meters for large tsunami and 10 to 20 cm for small tsunami. The tsunami magnitude m is good closely related to the earthquake magnitude of Kanamori scale Mw which is estimated from the strain energy released in earthquakes or the seismic wave energy. Combining Mw and the seismic moment M0, which is empirically expressed as log M0 = 0.77m + 26.89.
URI: http://hdl.handle.net/2261/12741
ISSN: 00408972


ファイル 記述 サイズフォーマット
ji0543008.pdf533.82 kBAdobe PDF見る/開く



Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - ご意見をお寄せください