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26. 臺灣中部の地殼變形(第一報)
26. Crustal Deformations in Central Taiwan.(Part 1)
Hukunaga, Mituo
133998
Sato, Mitunosuke
133999
453
application/pdf
The results of the present study are summarized as follows; (1) From the results of re-triangulation of the primary triangulation points in the central part of Taiwan, where the destructive earthquake of 1935 occurred, the horizontal strain components are calculated for each triangle having three adjoining triangulation points at their vertices. The geographical distribution of rotation, dilatation, shear, maximum shear, as well as the principal strains, are shown. (2) The mode of deformation is discussed on the basis of two different assumptions. The one that the deformation is continuous in the zone of active faults and the other that the deformation is discontinuous there. (3) In that region where the epicentres of the after-shocks were concentrated, the earth's crust was elevated in a marked manner, as it had already done in other districts. (3) A linear relation between the horizontal and the vertical disturbances was noticed, and its physical meaning considered. In conclusion, the writers wish to express their sincere thanks to Professor Sakuhei Fujiwhara for his suggesting the subject for study, and to Doctor Naomi Miyabe for much information and kind guidance received throughout the course of this study.
昭和10年4月21日の臺中新竹烈震後行はれた復舊測量に依つて地震前後數年間に於ける地殼變動が明らかにされた.本論文はそれを取扱つたものである.今囘は一等三角點と一等水準點との變動に就いて論ずるに止めた.水平の歪の計算に當つては二つの別な方法を取つた.第一は各三角内で變移が連続であると假定して行つたもので,その結果は第4圖~第7圖に示してある.紙湖斷層附近では,それに垂直な縮みが大きく,屯子脚斷層附近ではそれに略平行な縮みが大きい.垂直變動については紙湖斷層の四側に二つの隆起部分が有り,而もそれが餘震の頻發地域に近接してゐる事が著しい.最後に垂直變動と水平變動とを併せ考へて見た.即ち數學的に假りに定義した「水平のdisturbance」と「垂直のdisturbance」とを色々の地域に就いて比較した所,兩者の間に稍明瞭な關係を得たので之に對する物理的解釋を述べておいた.
departmental bulletin paper
東京帝国大学地震研究所
1938-06-20
application/pdf
東京帝國大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, Tokyo Imperial University
2
16
300
316
AN00029699
00408972
https://repository.dl.itc.u-tokyo.ac.jp/record/34549/files/ji0162008.pdf
eng