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タイトル: 28. Characteristics of Seismicity in South America
その他のタイトル: 28.南米大陸における地震活動の特徴
著者: Santo, Tetsuo
著者(別言語): 三東, 哲夫
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. 635-672
抄録: Seismicity of South America during the period from August 1960 to September 1968 was investigated using the earthquake data of Preliminary Determination of Epicenter (P. D. E.) by Coast and Geodetic Survey, U.S.A. Several characteristics were found in the seismic activity especially in the intermediate and deep earthquakes. Six "earthquake nests" were discovered in the upper mantle with the depth ranging from 100km down to 250km. It was practically shown that the development of the net of the observation stations has produced remarkable effects on the determination of epicenters and depths of earthquakes for the foci distributions of two nests. The net of observation stations for other earthquake regions was also studied. The investigation indicated that about 60% of earthquake took place in the upper mantle shallower than 200km, while the earthquakes with the depth from 320km to 520km took place only eight times in 1964. Earthquake deeper than 550 km occurred around two separate lines, and the energy released by these deep earthquakes is quite predominant. Both the upper mantle earthquakes and deep ones along the northern active line were noticed to contain some multiple events, closely related with each other both in space and time. Distribution of the earthquake energy released from the meshes of 1°×1° in South America was illustrated, and its relation with the frequency distribution in the same meshes was studied. Distributions of frequency and released energy of shallow earthquakes along the western coast were investigated also.|1960年8月から1968年9月までの8年2ケ月間における南米大陸の地震活動をUSCGSの資料で調べ,その特徴をさぐつた.
URI: http://hdl.handle.net/2261/12473
ISSN: 00408972


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