Seismic Reflection Survey Using Vibroseis at Taiyo Village, Ibaraki Prefecture, Central Honshu, Japan, and Its Implication of the Southern Trace of the Tanagura Tectonic Line

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  • HAYASHI Hiroki
    Solid Earth Research Group, National Research Institute for Earth Science and Disaster Prevention
  • KASAHARA Keiji
    Solid Earth Research Group, National Research Institute for Earth Science and Disaster Prevention
  • KIMURA Hisanori
    Solid Earth Research Group, National Research Institute for Earth Science and Disaster Prevention
  • KAWANAKA Taku
    JGI Inc., Meikei Building
  • OTA Yoichi
    JAPEX Co., Ltd., Ten'nozu Yusen Building

Bibliographic Information

Other Title
  • 茨城県大洋村におけるバイブロサイス反射法探査
  • 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
  • イバラキケン タイヨウムラ ニ オケル バイブロサイス ハンシャホウ タンサ タナグラ コウゾウセン ナンポウ エンチョウ ニ カンレン シテ
  • ―棚倉構造線南方延長に関連して―

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Description

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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