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タイトル: 震源決定の精度について(第3報)
その他のタイトル: On the Accuracy of Hypocentre Determination 3
著者: 浅野, 周三
著者(別言語): Asano, Shuzo
発行日: 1959年8月25日
出版者: 東京大学地震研究所
掲載誌情報: 東京大學地震研究所彙報. 第37冊第2号, 1959.8.25, pp. 337-345
抄録: At 12h 00m, June 15, 1958, 156 tons of explosives were fired in Gifu Prefecture, central part of Japan, in order to obtain rocks for the construction of Mihoro dam. The seismic waves generated by this blast were recorded at about 10 observatories under the Japan Meteorological Agency. Although the recorded amplitude was rather small and the onset of initial motion was not clear except at Matsushiro, the attempt to determine the quantities concerning hypocentre was done by the method of least squares. The results which are given in Table 2 confirmed my previous conclusions. In the present calculation the position of epicentre was determined within 0.1 degree, the velocity was determined rather well, but the determination of the origin time is not good. Giving weight to the observation at Matsushiro we could obtain better results, especially with respect to the origin time. The velocity of <S wave was also obtained as 3.34km/sec.
URI: http://hdl.handle.net/2261/11951
ISSN: 00408972


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