利用重力梯度张量研究黑龙江省虎林盆地的断裂构造

以重力异常为依据，利用快速傅里叶变换计算了虎林盆地的重力全梯度张量。根据Vxx和Vyy的零值线能突出场源体的边界以及走向近似于x或y轴方向的地质体、Vzz能够圈定异常体的位置和范围以及Vzx，Vzy和Vxy能够突出显示NS，EW和NE（NW）向的断裂构造线，分析虎林盆地重力异常及其梯度张量展布特征。推断研究区存在近NE，NW，NEE，近EW向和NS向断裂，对其中5条深大断裂进行了描述。根据重力异常及其全梯度张量和断裂展布特征，可以将虎林盆地划分为3个隆起和2个凹陷，与迎春隆起、虎林河凹陷、虎林中央隆起、东林子凹陷和兴凯湖隆起5个构造单元存在很好的对应关系。

Research on Faults and Structures of Hulin Basin in Heilongjiang Province by Gravity Gradient Tensor

The  full gravity gradient  tensor was calculated  from gravity anomaly data of Hulin Basin with    fast Fourier  transform. Based on zero values of Vxx and Vyy components  indicating boundaries of sources and  their orientations approximately along x or y axes, Vzz indicating the location and extent of anomalies, Vzx, Vzy and Vxy highlighting structure of NS, EW and NE (NW), a comprehensive analysis was conducted on  the characteristics of Hulin Basin gravity and  its gradient  tensor. We deduced  that there are NE-NW-NEE-and EW- and NS-trending  faults  in    the study area,  five of which were described. Based on  the synthetic characteristics of gravity anomalies and their tensor, and fault distribution, Hulin Basin consists of three uplifts and two depressions, corresponding to Yinchun uplift, Hulin River depression, central Hulin uplift, Donglinzi depression and Xingkai lake uplift.