UTokyo Repository 東京大学

UTokyo Repository >
131 地震研究所 >
東京大学地震研究所彙報 >

このページ(論文)をリンクする場合は次のURLを使用してください: http://hdl.handle.net/2261/12877

タイトル: 12. Extended Travel-Time Tables for the JMA Standard Model of the Crust and Upper Mantle Structure beneath the Japanese Islands
その他のタイトル: 12. 日本の標準速度構造の走時表
著者: Maki, Tadashi
著者(別言語): 牧, 正
発行日: 1983年10月22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58冊第2号, 1983.10.22, pp. 311-383
抄録: The travel-time table for the JMA standard model of the crust and upper mantle is extended to include more distant ranges up to 30° by increment of epicentral distance of 0.1° and travel times to the hundredths of a second. Travel times are calculated by the ray theory for very fine increments of take-off angles. Besides the travel times take-off angles at sources, incident angles to the earth's surface, apparent velocities, depths of ray bottom and geometrical spreading factors are also derived. These tables include effects of the 20°-discontinuity without smoothing and are useful for precise location of earthquake hypocenters, precise determination of fault-plane solutions and fine structure of the crust and upper mantle. The travel times in the present study have differences of less than 0.5 second from those of the ICHIKAWA-MOCHIZUKI table (1971) for the JMA standard model. Differences of travel time between previously proposed tables and models for Japan amount to about 10 seconds. Travel times are also compared with a velocity model accompanying the low-velocity layer in the upper mantle. Contrary to the general acceptance no travel time jumps are observed and receding travel times and apparent velocities with epicentral distances are obtained for the velocity decreasing at the top of the low-velocity layer.
URI: http://hdl.handle.net/2261/12877
ISSN: 00408972


ファイル 記述 サイズフォーマット
ji0582002.pdf4.08 MBAdobe PDF見る/開く



Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - ご意見をお寄せください