首页> 外文OA文献 >千屋断層(花岡)を横断する浅層反射法地震探査: データ取得と処理について
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千屋断層(花岡)を横断する浅層反射法地震探査: データ取得と処理について

机译:千叶断裂带(花冈)的浅层地震反射调查:数据采集和处理

摘要

The Senya fault, northern Honshu, Japan, which generated the Rikuu earthquake (Mj 7.2) 1896, is a typical intra-arc active thrust. Subsurface geometry provides essential information for better understanding strong ground motions and crustal deformation processes. A high-resolution seismic reflection survey was conducted along the 63km long seismic line across the toe of the thrust to reveal the subsurface geometry. The seismic source was a Mini-vibrator truck and the receiver interval was 10 m. The seismic data were processed by the standard common mid-point method. The Senya fault is clearly identified as a boundary between horizontal reflectors of the basin fill in the Yokote basin and moderately dipping reflectors beneath the Senya hills. The thrust occurred in late Miocene mudstone, and shows a flat and ramp geometry. The emergent thrust dips 30 degrees down to 500m, and changes its dip to subhorizontal following the distribution of the mudstone.
机译:日本本州北部的Senya断层是典型的弧内活动推力,它在1896年引起了Rikuu地震(Mj 7.2)。地下几何学提供了必要的信息,可以更好地理解强地面运动和地壳变形过程。沿着63公里长的地震线在推力的脚趾上进行了高分辨率地震反射调查,以揭示地下几何形状。地震源是一台小型振动卡车,接收器间隔为10 m。地震数据通过标准的通用中点方法进行处理。 Senya断层清楚地被确定为Yokote盆地填充盆地的水平反射器与Senya山下的中等倾角反射器之间的边界。推力发生在中新世晚期泥岩中,呈现出平坦和倾斜的几何形状。涌出的推力倾角下降30度至500m,并随泥岩的分布而改变为水平以下。

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