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タイトル: 関東大地震並に丹後大地震に表はれたる断層の横ずれに就いて
その他のタイトル: On the Horizontal Shift of the Dislocation accompanied by the Recent Destructive Earthquakes in the Kwanto District and in Tango Province
著者: 今村, 明恒
岸上, 冬彦
著者(別言語): Imamura, Akitune
Kishinouye, Fuyuhiko
発行日: 1928年8月24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5冊, 1928.8.24, pp.35-41
抄録: It is well known that the Go-mura fault, the larger of the two dislocations accompanied by the recent destructive Tango earthquake, actually shifted horizontally as much as 270 cm. The present writers have devised a method other than that of direct measurement for the estimation of the amount of shift by taking into consideration the relation which may exist between the distance of each geodetic station from the fault and the horizontal displacement assumed at the corresponding station by the earthquake. For this purpose, they selected only such stations as were situated on, or near, the straight line drawn at right angles to the fault through the point of its maximum shift. (See Fig. 1.) In Tables I and II, x indicates the distance of each station from the fault line, and y the displacement of same parallel to the fault. The diplacements here adopted were computed from the results of trigonometrical observations carried out both before and after the earthquake under the assumption that the two southernmost stations in the surveyed area suffered no displacement. The values of y in Table I are deduced from the observations of 1884-1888 and June, 1927, while those in Table II are based on those made in 1884-1888 and Aug., 1927. Plotting them as in Fig. 2, the data in the second table give more satisfactory results. The curve showing the relation between x and y has two branches; the intercept of the axis of y by these branches corresponds to the shift of the fault and is found to be in fair agreement with the actual measurements.
URI: http://hdl.handle.net/2261/9895
ISSN: 00408972


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