盘谷寺-新乡断裂倾向反转成因探讨

Study on the Tendency Inversion Genesis of Pangusi-Xinxiang Fault

盘谷寺-新乡断裂在大高村附近断层倾向发生反转,大高村以西倾向为南,大高村以东倾向为北。为查明倾向反转成因,跨断层布设3条浅层地震测线,通过采用高分辨率地震数据及高精度数据处理技术,获得清晰的地下结构与构造成像。结果显示,武陟隆起北侧边缘发育有隐伏隆起,该隆起的发育使得盘谷寺-新乡断裂大高村以西段在L1测线与L2测线之间消失,同时向南倾的武陟断裂演变为济源凹陷的边界断裂,自西向东该隆起规模逐渐增大。该隆起北侧边缘开始发育北盘谷寺-新乡断裂大高村以东段,南侧边缘开始发育向南倾的平陵断裂,且随隆起规模的继续增大,盘谷寺-新乡断裂大高村以东段及平陵断裂自西向东活动性逐渐增强。推测该隐伏隆起是引起该区盘谷寺-新乡断裂倾向反转的主要成因。

The Pangusi-Xixiang fault tendency reversed near the Dagao village.The western part is south tendency and east part is north tendency.In order to determine the inversion genesis in the Pangusi-Xinxiang fault tendency reverse regional,we set 3 shallow seismic survey lines across the fault.Based on the high-resolution seismic data acquisition and high-precision data processing technology,the clear underground structure and tectonic imaging is obtained of the fault tendency reverse regional.The results show that there is a hidden uplift in the north edge of the Wuzhi uplift,and the development of the hidden uplift makes the western part of the Pangusi-Xinxiang fault disappeared between L 1 and L 2.At the same time,the Wuzhi fault became the boundary fault of the Jiyuan sag.From west to east,the hidden uplift scale increases gradually.The east part of the Pangusi-Xinxiang fault and the Pingling fault began to develop at the margin of the hidden uplift.With the hidden uplift increasing,the activity of Pangusi-Xinxiang fault and the Pingling fault gradually increases.It is suggested that the hidden uplift is the main cause of the tendency inverse of the Pangusi-Xinxiang fault.The results provide a reliable basis for the characteristics and activity evaluation of Pangusi-Xinxiang fault.