We conducted seismic reflection surveys in the northwest marginal part of the Kanto plain, Japan. In the 12-kilometers long seismic section, homoclinic reflectors dipping northeast are dominant between the Kushibiki fault and the Fukaya fault. They are traceable from the near surface down to 1.5 seconds in two-way time, but become unclear beyond there. Some of them are very continuous and probably correspond to acid tuff layers in the Neogene sedimentary rocks. A flexure continues vertically down to 1.5 seconds near the Fukaya fault. Reflectors are almost horizontal on the northeast of the Fukaya fault. Few events are seen on the southwest of the Kushibiki fault. Fault planes or gaps of reflectors are not recognized in the seismic section but the deep structure changes suddenly at the two faults.


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