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タイトル: 35.光波測量による地殻変動の観測 : 第3報 既設基線網の再測ならびに中型基線絹の設定'昭和43年度)
その他のタイトル: 35. Observation of Horizontal Strain Accumulation by Electro-Optical Means : 3 Resurvey in Central Honshu, Japan, for the Period May, 1968~April, 1969
著者: 笠原, 慶一
岡田, 惇
柴野, 睦郎
佐々木, 幸一
松本, 滋夫
平井, 正代
著者(別言語): Kasahara, Keichi
Okada, Atusi
Shibano, Mutsuro
Sasaki, Koichi
Matsumoto, Shigeo
Hirai, Masayo
発行日: 1969年9月30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47冊第4号, 1969.9.30, pp. 803-818
抄録: The present paper reports the authors'Geodimeter work for the period May, 1968~April, 1969, which is the continuation of their previous work since 1963. During this period, they did not observe such active deformation as those associated with the Matsushiro swarms. Resurvey on the Omachi network in August and December, 1968, was the only emergent field expedition in the present period, which purposed to monitor an abnormal seismicity discovered there. However no significant deformation was detected on it. According to the seismic observations and precise levellings conducted in parallel with the Geodimeter surveys, no evidence for further development of the activity was discovered. Therefore, we may accept the negative data on the Omachi network as reasonable, or at least, not contradictory to the other sorts of information. Strain accumulation in the Minobu and Ojiya areas might be more interesting from a tectonic point of view, though the observed changes in base-line lengths are not so large as to permit a definite conclusion. In the Ojiya area, for example, strain accumulation in the east-west direction amounted, in the past eighteen months, to +6×10-6, exceeding obviously the standard deviation in the ordinary case. We had no local earthquakes there since the first surveys in 1967, so that the observed deformation might be a creep-type event. It is rather natural for us to see the land in active folding areas as Ojiya subject to strain accumulation at a high rate, but the authors would like to see the bese-line connecting the two neigh-boring axes of folding having undergone extension rather than contraction. Further observations are needed in order to clarify the nature of the present event. Some technical development has been achieved in this period, too, regarding the construction of larger base-line networks, data-processing and frequency check of a Geodimeter. These are also described, briefly, in the present paper.
URI: http://hdl.handle.net/2261/12480
ISSN: 00408972


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