Relation between Tsunami Magnitude and Wave Energy
application/pdf 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 t...
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東京大学地震研究所
1980
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ftunivtokyo:oai:repository.dl.itc.u-tokyo.ac.jp:00033101 2023-05-15T16:59:22+02:00 Relation between Tsunami Magnitude and Wave Energy 津波の規模階級とエネルギーとの関係 羽鳥, 徳太郎 129106 1980-03-31 application/pdf https://repository.dl.itc.u-tokyo.ac.jp/record/33101/files/ji0543008.pdf jpn jpn 東京大学地震研究所 東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 3 54 531 541 AN00162258 00408972 https://repository.dl.itc.u-tokyo.ac.jp/record/33101/files/ji0543008.pdf 453 1980 ftunivtokyo 2022-12-23T02:48:14Z application/pdf 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. departmental bulletin paper Other/Unknown Material Kamchatka Alaska The University of Tokyo: UT Repository |
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453 羽鳥, 徳太郎 129106 Relation between Tsunami Magnitude and Wave Energy |
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description |
application/pdf 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. departmental bulletin paper |
author |
羽鳥, 徳太郎 129106 |
author_facet |
羽鳥, 徳太郎 129106 |
author_sort |
羽鳥, 徳太郎 |
title |
Relation between Tsunami Magnitude and Wave Energy |
title_short |
Relation between Tsunami Magnitude and Wave Energy |
title_full |
Relation between Tsunami Magnitude and Wave Energy |
title_fullStr |
Relation between Tsunami Magnitude and Wave Energy |
title_full_unstemmed |
Relation between Tsunami Magnitude and Wave Energy |
title_sort |
relation between tsunami magnitude and wave energy |
publisher |
東京大学地震研究所 |
publishDate |
1980 |
url |
https://repository.dl.itc.u-tokyo.ac.jp/record/33101/files/ji0543008.pdf |
genre |
Kamchatka Alaska |
genre_facet |
Kamchatka Alaska |
op_relation |
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 3 54 531 541 AN00162258 00408972 https://repository.dl.itc.u-tokyo.ac.jp/record/33101/files/ji0543008.pdf |
_version_ |
1766051619350249472 |