茨城県下館市における反射法探査

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書誌事項

タイトル別名
  • Seismic Reflection Survey in Shimodate, Ibaraki Prefecture
  • 茨城県下館市における反射法探査--先新第3系基盤までの地下構造
  • イバラキケン シモダテシ ニ オケル ハンシャホウ タンサ センシンダイ3ケイ
  • 先新第三系基盤までの地下構造
  • Geological Structure down to Pre-Neogene Basement

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抄録

A seismic reflection survey was conducted in Shimodate city, several kilometers west of the Yamizo mountains in Kanto plain. Results of seismic interpretations are (1) RMS velocities are 1800m/s in shallow part and increase to more than 2400m/s below 1.0s in two-way time, (2) Top of the pre-Neogene basement shows steep dip of 30° which falls down westward from 650m into 1150m in depth, (3) Layers above the steeply dipping basement also show steep dip as the basement up to around 400m in depth, but layers whose depth is shallower than around 400m are horizontal and not affected by the basement slope, (4) Unconformities are found, one in depth between 400m and 270m, the other 600m and 380m. The geological structre around the survey area is inferred as follows, based mainly on this seismic data as well as on gravity, surface geology and well data. The basement outcrops in the Yamizo mountains, extends westward with very gentle dip of 1° near the surface ranging from several tens meter to one hundred and several tens in depth, falls down into 1200m in depth with dip of 30° near 140°E and the dip becomes gentle again in the west of 140°E. The basement in the east of 140°E relatively upheaved after the sediments below 400m deposited. This upheavement of the basement is observed as gravity anomaly which could be correspond to the Karasuyama-Sugaonuma fault.

収録刊行物

  • 地震　第２輯

    地震　第２輯 47 (1), 33-41, 1994

    公益社団法人 日本地震学会

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