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タイトル: Effects of Observational Conditions on Hypocenter Location of Intermediate : Depth Earthquakes in Central Japan
その他のタイトル: 震源決定における観測条件の影響 : 中部日本稍深発地震の場合
著者: Maki, Tadashi
著者(別言語): 牧, 正
発行日: 1982年7月16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57冊第1号, 1982.7.16, pp. 49-82
抄録: Effects of observational conditions (errors in travel times, station numbers, and distance and azimuthal coverages of stations) on hypocenter location have been studied for an intermediate-depth earthquake of September 21, 1971, which occurred at the depth of 190 km beneath Niigata Prefecture, Central Japan. Distance range and configuration of stations relative to epicenters usually have greater effects on hypocenter location than observational errors in travel times. Especially when determined from station subsets located within limited ranges of azimuth and distance, great shifts are observed in focal depth. Such an effect might be fatal in hypocenter location of microearthquakes by a very small number of stations. A systematic reduction of travel-time residuals by using station corrections could make it possible to obtain a more accurate hypocenter location, especially in a region of anomalous structure associated with the descending lithospheric plate, such as the Japanese Islands. Differences among the mean residuals at individual stations observed for 40 intermediate-depth earthquakes beneath Central Japan are statististically significant.
URI: http://hdl.handle.net/2261/12834
ISSN: 00408972


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