Earthquake Research Institute, the University of Tokyo
抄録
1969年9月9日の岐阜県地震に際しては各地の地殻変動観測所においてstrain stepが記録された.それらを総合してみると,stepの向きや大きさに関してかなりの規則性が見られ,上記地震による地殻歪の場の全国的パターンがかなりの程度に反映されているように思われるstrain stepの可能性については,従来も単一の観測所の記録に基ずいて論じられた事はあったが,全国的観測網を活用すればさらに確実に取り扱うことができる.また,このような経験を積み重ねていけば,現行の地殻変動観測方式が地震予知研究などにどの程度役立つかについてめやすも得られよう.|The writer collected strainmeter records of the Gifu earthquake of September 9, 1969 (M=6.6) from the fifteen crustal movement stations, which are distributed widely in Honshu, Japan. The purpose of this work is to investigate the associated changes in the earth's strain field by examining whether the strain-steps decay reasonably with distance, as expected from a dislocational fault model of the earthquake source. Roughly speaking, the amplitude of the recorded steps is inversely proportional to the cube of the distance from the source, and amounts to 0.1×10-6 approximately at Inuyama which is only 70km away from the epicenter. For further examination, the writer dissolved the three components of strains at each station into the two principal strain components, which are parallel and perpendicular to the supposed fault, respectively, and compared them with the theoretical values from Press's charts. There is a considerable scattering of the observational data about the theoretical ones. However, we still notice an indistinct but systematic correlation of the two, suggesting that the best correlation is obtained by assuming the fault offset, U, as 0.3m, approximately.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
48
号
6
ページ
1217 - 1233
発行年
1971-02-27
ISSN
00408972
書誌レコードID
AN00162258
フォーマット
application/pdf
日本十進分類法
453
出版者
東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
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69.岐阜県中部地震-1969年9月9日-による地殻歪の場
ji0486016.pdf
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