联合安徽CORS分析郯庐断裂带南段地壳形变与断层活动特征

使用GAMIT/GLOBK处理2013-01~2018-06期间37个AHCORS参考站观测文件，分别获取站点在ITRF2008和欧亚框架下的速度场。利用多尺度球面小波模拟出的速度场与实际速度场的误差在2 mm/a以内，说明此方法可有效反映该区域的地壳运动情况。采用多尺度球面小波法解算郯庐断裂带南段及周边地区的应变率并对其进行分析。结果表明，总体上看，郯庐断裂带南段以西除阜阳、徐州、枣庄等地，大部分地区呈面膨胀状态，以东地区大多表现为面压缩状态；应变方向变化异常的地区，均处于面膨胀与面压缩的交界地带；最大剪应变率沿郯庐断裂带南段两侧呈对称分布，西北和东南地区为高值区域，存在着较大的应变积累，有发生地震的可能，应予以关注；郯庐断裂带南段主要表现为右旋走滑，且北部存在着拉张，拉张分量向南逐渐递减，在最南部转变为压缩的状态。

Analysis of Crustal Deformation and Fault Activity Characteristics in the Southern Segment of Tanlu Fault Zone with AHCORS

Using GAMIT/GLOBK software, we process the observation files of 37 AHCORS reference stations during Jan. 2013 and June 2018, and obtain the velocity fields of the stations under ITRF2008 and Eurasia frameworks. The error between the velocity field simulated by multi-scale spherical wavelet and the actual velocity field is less than 2 mm/a, indicating that this method effectively reflects crustal movement in this region. We use multiscale spherical wavelet to calculate and analyze the strain rates of the southern segment of the Tanlu fault zone and its surrounding areas. The results show that most of the areas west of the southern segment of the Tanlu fault zone are compressed, while most of the areas east of the Tanlu fault zone are dilatated in general. The abnormal variation of strain direction is located at the junction of plane expansion and plane compression. The maximum shear strain rate is symmetrically distributed along both sides of the southern segment of the Tanlu fault zone, and the northwest and southeast regions are high value regions with large strain accumulation and the possibility of earthquake, to which more attention should be paid. The southern segment of the Tanlu fault zone is mainly dextral strike-slip, there is tension in the north, the tensile component gradually decreases in the south, and the southernmost part turns into compression state.