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1997年1月2日~1998年12月31日新疆伽师地震群的发生,使柯坪断裂的滑动速率和运动方向发生了改变。利用MD系列断层仪对柯坪断裂东段的运动特征进行了观测与研究。结果表明,柯坪断裂带东段在伽师地震群前后,垂直滑动速率由0.037mm/a提高到0.069mm/a,水平错动速度由左旋0.033mm/a改变为右旋0.016mm/a;水平运动方向发生了改变,垂直运动强度提高了近一倍;伽师震群发生前后,柯坪断裂东段附近的应力场发生了改变,最大和最小水平应变率的大小虽未变化,但主应变率轴绕顺时针方向旋转了16.7°。
The occurrence of the Jiashi earthquake swarm in Xinjiang from January 2, 1997 to December 31, 1998 changed the slip rate and direction of the Keping fault. The movement characteristics of the eastern section of Keping fault were observed and studied by using the MD series. The results show that the vertical slip rate increases from 0.037 mm / a to 0.069 mm / a and the horizontal slip velocity changes from 0.033 mm / a to 0.016 mm / a in the eastern part of the Keping fault zone before and after the Jiashi earthquake. The horizontal movement direction has changed, and the vertical movement intensity has nearly doubled. Before and after the Jiashi earthquake swarm, the stress field near the east section of Keping fault changed, and the maximum and minimum horizontal strain rates did not change, but the main The strain rate axis is rotated 16.7 ° clockwise.