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タイトル: 59.Revisions of my "Notes on the Origins of Earthquakes."
その他のタイトル: 59.發震機構に就いて(訂正)
著者: Inouye, Win
著者(別言語): 井上, 宇胤
発行日: 1937年12月20日
出版者: 東京帝国大学地震研究所
掲載誌情報: 東京帝国大学地震研究所彙報. 第15冊第4号, 1937.12.20, pp.956-964
抄録: The main revised results are as follows : (1) The amplitudes of the radial component of the displacement of the dilatational waves at a distant point have maximum values at certain ha's in both single and quadruple sources. (2) The amplitudes of the dilatational waves at a distant point in the two cases vanish when the wave lengths are very long compared with the dimension of the origin. (3) The amplitude of the dilatational wave generated from the quadruple source becomes appoximately equal to that from the single source when ha>4, as the result of the fact that the distortional waves appear less and less intensely than the dilatational waves when the wave length diminishes as compared with the size of the seismic origin. (4) In the case where the normal pressure at the origin is expressed by two zonal harmonics P0(cosθ) and P2(cosθ), so long as the wave length is greater than the radius of the seismic origin, the component due to the term P0(cosθ) is greater than that due to the term P2(cosθ). Should the wave length become comparable with the dimension of the seismic origin, we find that the azimuthal distribution of the displacement of the dilatational wave becomes quite similar to the azimuthal distribution in the pressure at the seismic origin. (5) Although we cannot, from the mere results of these calculations, say anything conclusive regarding the wave length of such waves as might be generated from a seismic origin, the writer considers it preferable to think that waves might be generated having wave lengths comparable with the size of the origin than to think that the wave lengths of the waves are very much longer than the dimension of the seismic origin, (see summary of my "Notes on the Origins of Earthquakes, second paper.")
URI: http://hdl.handle.net/2261/10357
ISSN: 00408972


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