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タイトル: High Sensitivity Tripartite Observation of Matsushiro Earthquakes. Part 4.
その他のタイトル: 高感度3点方式による松代地震の観測(4)
著者: Hamada, Kazuo
Hagiwara, Takahiro
著者(別言語): 浜田, 和郎
萩原, 尊礼
発行日: 1967年6月15日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第45冊第1号, 1967.6.15, pp. 159-196
抄録: The high sensitivity tripartite observation has been carried out since November, 1965 up to the present, at Hoshina, Nagano Prefecture, with a view to investigate the activities of micro- and ultra micro-earthquakes in the area of Matsushiro Earthquakes. The observational results in the periods from October 31 to December 18, 1965, from February 20 to June 20, 1966 and from June 21 to September 20, 1966 have been reported in the previous papers. Following from these papers, the present paper will report the results obtained at Hoshina in the period from the latter part of September to November, 1966. In addition the observational result obtained at the Sanada station, which was newly established in September 1966, will be reported together with a description of the observational and analytical method adopted there. At the present time, the Matsushiro earthquakes are observed by the temporary seismographic network with the acceleration seismographs and the HES electromagnetic seismographs set up at Hoshina, Akashiba, Zozan, Mori, Sakaki, etc. Besides this ordinary method of observation, the high sensitivity tripartite observation is carried out in and near the area of Matsushiro Earthquakes, i.e., at Hoshina (36°35'N, 138°16'E), Sanada (36°26'N, 138°18'E) , Kamimuroga (36°24'N, 138°9'E) and Asakawa (36°41'N, 138°11'E). Analysing the observational data from these seismographic stations, we found that the hypocenters could not be determined consistently with all observational data if we assume a uniform underground structure. However, we found it difficult, at the same time, to determine or assume any complicated structure immediately. Therefore we adopted as before the assumption of the uniform structure as a first approximation when determining the hypocenters. The hypocenters of the Matsushiro earthquakes should be determined more exactly on the basis of the most suitable underground structure, so our intention is to make further study on this problem using all data obtained at various stations in the area of Matsushiro. The results of this study will be reported at the next opportunity.
松代地震地域における微小及び極微小地震の活動を調べる目的で,高感度3点方式による地震観測が,若穂町保科において, 1965年11月から行なわれている.その結果はすでに第1報~第3報で報告してある.今回はその続きとして, 1966年9月下旬~11月下旬の期間の若穂町保科での観測結果と同年9月に新設された真田町・長での観測結果の報告である.若穂町保科での観測及び解析の方法は以前と重復するのでここでは省き,ここでは新しく始められた真田町・長での観測及び解析の方法についてのみ観測結果と共に報告する.
URI: http://hdl.handle.net/2261/12326
ISSN: 00408972


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