基于GRACE RL05数据探测苏门答腊M_W8.6地震的同震和震后形变

Co-seismic and Post-seismic Deformation of the Sumatra M_W8.6 Earthquake Detected by GRACE RL05 Data

利用美国德克萨斯大学空间研究中心(UTCSR)最新发布的GRACE卫星RL05月重力场模型数据,采用去相关和300km半径的高斯平滑滤波,提取出2012年苏门答腊MW8.6地震的同震和震后形变,并利用最小二乘拟合方法计算了地震前后震中附近区域的形变率。结果表明,GRACE卫星观测到的同震形变约为-8~14cm,震前和震后震中附近区域的形变率分别为1~4cm/a和-1^-3cm/a。

The latest UTCSR GRACE RL05 monthly gravity field models were processed by using decorrelation and 300 km radius Gaussian smoothing,and the co-seismic and post-seismic deformations of the Sumatra MW8.6earthquake are extracted successfully for the first time.Pre-seismic and postseismic deformation rates around the epicenter are calculated by using least squares.The results show that co-seismic deformation of about-8-14 cm,pre-seismic deformation rates of about 1-4cm/a and postseismic deformation rates of about-1--3cm/a can be detected by GRACE satellite gravity surveying.