宜川—泰安重力剖面布格重力异常及归一化总梯度的构造意义

摘要

Based on the high precision data of gravity observation and GPS,we have obtained finer first derivative gradient in vertical direction and the normalized total gradient (GH) image of Bouguer gravity anomaly in Yichuan-Tai'an profile.A further investigation on the vertical first derivative gradient characteristics is carried out with the results in literature,from which we could conclude that it mainly expresses the shallow source location and features of low density geological body.Using the GH image,we also analyzed and explained the spatial distribution characteristics of seven major faults that the profile goes through and speculated the possible buried depths and properties of each fault.%利用宜川—泰安剖面高精度重力观测及GPS测量结果,计算得到该剖面较为精细的垂向一阶导数梯度和布格重力异常归一化总梯度图像.结合前人相关研究结果,本文认为垂向一阶导数梯度主要反映浅部异常场源的位置和低密度地质体的特性.利用该梯度图像,对宜川—泰安剖面经过的7条主要断裂及其空间分布特征进行分析解释,并推测各断裂的可能埋深和性质.