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タイトル: 73.岐阜県中部地震-1969年9月9日-被害地調査報告
その他のタイトル: 73. Geological Report on Damage in the Okumino Area, associated with the Earthquake of the Central Part of Gifu Prefecture, September 9, 1969
著者: 松田, 時彦
恒石, 幸正
著者(別言語): Matsuda, Tokihiko
Tsuneishi, Yukimasa
発行日: 1971年2月27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48冊第6号, 1971.2.27, pp. 1267-1279
抄録: A locally destructive earthquake with magnitude 6.6 occurred in Okumino area, Gifu Prefecture, Central Japan on September 9, 1969 (Fig. 1). The damage area is underlain mainly by Paleozoic formations and Cretaceous rhyolitic pyroclastic deposits, which are partly covered with dissected Quaternary volcanoes (Figs. 2 and 3). A number of Quaternary faults which are dominantly of strike-slip nature, occur in Central Japan which includes the epicentral area (Fig. 6). The epicentral area is located about 10km west of a main fault of the Atera fault system, which is an active left-lateral strikeslip fault of Central Japan. Although a few active faults are in the meisoseismal area, no definite evidence of surface faulting was found along any active fault, except some echelon cracks suggesting a left-slip on a fault line at one locality. The push pull distribution of P waves (Fig. 1), the distribution of aftershocks and the shape of the meisoseismal area (Fig. 5) suggest the concealed seismic fault to be a northwest-trending left-lateral strike-slip fault, which strikes parallel to the Atera fault and has the same sense of displacement. The direction of maximum pressure of the present earthquake corresponds well with the Quaternary stress direction, which has been inferred from the study of active fault systems in Central Japan.
URI: http://hdl.handle.net/2261/12571
ISSN: 00408972


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