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据重力场特征分析,将地质划分的金城关—砂金坪断裂,推断分解为金城关断裂与雁滩南—柳沟店隐伏断裂,这是两条平行斜列展布的断裂。其中以密集重力梯级带反映金城关断裂特征最明显,进而利用重力水平一阶导数、二阶导数和垂直一阶导数求解断层接触带总体产状。结合区域应力场特征及盆山耦合动力学模式,推断断裂在深部是北倾的逆断裂,与地震波速场反映断裂产状吻合。
According to the analysis of gravity field characteristics, the geologically divided Jinchengguan-Shajinping fault is inferred to be decomposed into the Jinchengguan fault and the Yantannan-Liugoudian buried fault, which are two parallel oblique columns distributed faults. Among them, the dense gravity cascade belt is the most obvious characteristic of Jinchengguan fault. Then the first-order gravity derivatives, second-order derivatives and first-order vertical derivatives are used to solve the overall fault zone contact. Combined with the regional stress field characteristics and the basin-mountain coupling dynamic model, it is inferred that the fault is a northward reverse fault in the deep part, which is consistent with the seismic wave field reflecting the fault shape.