地震 第2輯
茨城県大洋村におけるバイブロサイス反射法探査
―棚倉構造線南方延長に関連して―
林 広樹笠原 敬司木村 尚紀川中 卓太田 陽一
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58 巻 (2005-2006) 1 号 p. 29-40

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We conducted a seismic reflection survey along the coast line of the eastern part of the Kanto Plain, central Japan. Four reflectors were clearly recognized in the reflection profile: Reflector A is nearly flat (about 0.1-0.25s in 2-way time); Reflector B is gently tilted to the south at about 0.25-0.5s; Reflector C is waved around the 0.5-1.0s at the northern and southern parts of the profile; Reflector D is hugely waved deeper than 1.5s. With respect to borehole data adjacent to the seismic line, the strata between Reflectors C and D can be correlated with the early middle Miocene half-graben deposits distributed along the Tanagura Tectonic Line. It suggests that the southern trace of the Tanagura Tectonic Line should be concealed at just east of the present seismic line.

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