著者

和達 清夫 益田 クニモ

出版者

公益社団法人 日本気象学会

雑誌

気象集誌. 第2輯 (ISSN:00261165)

巻号頁・発行日

vol.10, no.12, pp.670-675, 1932

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To see the general state of the seismic activity in the Kwantô-district, where is noted by the frequent occurrence of earthquakes and especially by the Great Earthquake of Kwantô (Sept. 1, 1923), North Idu (Nov. 26, 1930) and West Saitama (Sept. 21, 1931), the large earthquakes occurred in this district during the last 9 years are investigated about the position of their origins particularly taking account of the depth of focus.

著者

和達 清夫 鷺坂 清信 益田 クニモ

出版者

公益社団法人 日本気象学会

雑誌

気象集誌. 第2輯 (ISSN:00261165)

巻号頁・発行日

vol.10, no.8, pp.460-474, 1932

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It has been generally known that earthquakes take place at any depth in the crust as far as about 500km. below the surface. For the investigation of near earthquakes, a standard table of travel time of seismic waves transmitted from the origin of variable depths is required to be made by the recent materials obtained in the seismometrical observation. For this purpose, the time-distance curve of the great earthquake occurred in North Idu district on Nov. 26, 1930 is adopted and the values of seismic wave velocity calculated by Mr. Honda are used in this paper. Thus, several tables of the travel time concerning the depth of focus and the epicentral distance are obtained. They are considered to be applicable for various branches of our practical seismology. Further, we have also calculated a table of the correction due to the depth of focus which must be applied on the travel time at a large epicentral distance in the case of distant earthquakes. As for further investigations of seismic wave propagation based upon the present tables, we shall write in the next report.

著者

和達 清夫 益田 クニモ

出版者

公益社団法人 日本気象学会

雑誌

気象集誌. 第2輯 (ISSN:00261165)

巻号頁・発行日

vol.11, no.9, pp.389-394, 1933

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This report is presented for the purpose of showing the general activity of recent large earthquakes (1919-1928, Sep.) in the world. The materials were all taken from I. S. S. issued from the University Observatory, Oxford.

著者

和達 清夫 益田 クニモ

出版者

(公社)日本気象学会

雑誌

気象集誌. 第2輯 (ISSN:00261165)

巻号頁・発行日

vol.11, no.10, pp.444-454, 1933 (Released:2009-02-05)

参考文献数

6

被引用文献数

3

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This report is intended to give a complete table of travel times of earthquake waves such as P, S pP, PP, sS, SS, etc. especially taking the depth of focus into account. The calculation for the present table is based upon the results already obtained by us in the previous investigations on both near and distant earthquakes, whose epicente. s lie near the Japanese Islands. (Vol. 10, No.8, p. 460-474 and Vol. 11, No.1, p. 14-28 of this journal). This report is only a summarized one and the full text will be published in the Geophysical Magazine in the near future.