赣鄂皖交界地区三维地壳运动特征分析

Analysis of 3D crustal movement characteristics in Jiangxi-Hubei-Anhui junction area

利用gamit/globk软件处理赣鄂皖交界地区7个全球导航卫星系统基准站2010年10月至2020年12月近10 a的数据,在建立最优噪声模型的基础上获取了基准站的三维平均速度场和动态变化速度场,并分析了赣鄂皖交界地区地壳水平、垂直运动的变化特征。结果表明,该地区地壳在水平上往东南方向运动,东方向平均速度场为(33.3±0.2)mm/a,南方向平均速度场为(11.5±0.1)mm/a,各时间跨度分析结果表明个别测站呈现加速或减速的运动趋势;垂直方向表现为周年、半周年周期运动,周年的平均振幅为(3.2±0.7)mm,半周年的为(1.0±0.4)mm。

This study utilized the gamit/globk software to process the data of eight Global Navigation Satellite System(GNSS)reference stations in the border area of Jiangxi,Hubei and Anhui province from October 2010 to December 2020.An optimal noise model was established to obtain the three-dimensional average and dynamic velocity field of the reference stations,and to analyze the variation characteristics of the horizontal and vertical crustal movement in the boundary area.The results indicate that the crust moves horizontally to the southeast,with an average velocity of 33.3±0.2 mm/a in the east direction and 11.5±0.1 mm/a in the south direction.The analysis of each time span reveals acceleration or deceleration movement trends of individual stations,and periodic movements in the vertical direction with an annual amplitude of 3.2±0.7 mm and a semiannual amplitude of 1.0±0.4 mm.The motion characteristics of individual stations can provide a certain basis for determining earthquake trends.