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タイトル: 座間―平塚におけるバイブロサイス反射法地震探査
その他のタイトル: Seismic reflection survey using Vibroseis in Zama city and Hiratsuka city, Kanto basin, central Japan
著者: 川崎, 慎治
川中, 卓
太田, 陽一
井川, 猛
瀬尾, 和大
山中, 浩明
杉原, 英和
著者(別言語): Kawasaki, Shinji
Kawanaka, Taku
Ohta, Yoichi
Ikawa, Takeshi
Seo, Kazuoh
Yamanaka, Hiroaki
Sugihara, Hidekazu
キーワード: Seismic survey
Aikawa Group
Acoustic basement
Isehara fault
発行日: 2006年
出版者: 東京大学地震研究所
掲載誌情報: 地震研究所彙報. 第81号第2冊, 2006, pp. 193-204
抄録: Seismic reflection survey using Vibroseis with a line length of 13km was conducted around Zama city and Hiratsuka city, in the southwest part of the Kanto basin. Seismic refraction records were also acquired by shooting at the both ends of the survey line with over 100 vertical stacks. From the seismic section, a clear reflector interpreted as the top of the acoustic basement is identified. The basement has a very complex structure with depths varying from 200m to 1200 m. As a result of a refraction method analysis, the P-wave velocity of the basement is estimated to be about 4.3 km/s. Comparing acoustic logging data of Atsugi observation well, it corresponds to the lower part of the Aikawa Group (Miocene volcanics). The interpreted basement has a different velocity and geology from that commonly observed in the Kanto plain (4.8-5.5 km/s layer). Above the basement, sediments can be divided into two parts by a remarkable reflector seen at depths of 200 300m at both ends of the line. As this reflector has a velocity of 2.3-2.4 km/s, this corresponds to the boundary between the Sagami Group (Quaternary sediments) and the Aikawa Group observed at the Atsugi well. The Sagami Group contains sharp and continuous reflectors with flat or gentle dips, whereas the upper part of the Aikawa Group is accompanied with considerable folds and faults.
URI: http://hdl.handle.net/2261/5921
ISSN: 00408972


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