柯坪断裂东段现今微动态运动监测与研究

柯坪断裂东段现今微动态运动监测与研究

荆燕1，2 ，张世中1，熊玉珍1 ，李宏1 ，刘凤秋1，孙起伟1, 董建业1，张鸿旭1，王海忠1 ，陈葛天1

1.中国地震局地壳应力研究所，北京 100085; 2.中国地质大学(北京) 地球科学与资源学院，北京 100083

收稿日期:2007-03-20 修回日期:2007-03-20 出版日期:2007-03-20 发布日期:2007-03-20

Monitoring and Research on Micro Kinematics of the Eastern Segment of the Keping Fault

JING Yan1，2 , ZHANG Shizhong1, XIONG Yuzhen1 , LI Hong1 ,LIU Fengqiu1, SUN Qiwei1, DONG Jianye1 ,ZHANG Hongxu1 ,Wang Haizhong1 ,CHEN Getian1

1. Institute of Crustal Dynamics, CEA, Beijing 100085, China; 2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

Received:2007-03-20 Revised:2007-03-20 Online:2007-03-20 Published:2007-03-20

摘要/Abstract

摘要： 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0.037 mm/a提高到0.069 mm/a，水平错动速度由左旋0.033 mm/a改变为右旋0.016 mm/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°。

Abstract: The Jan.2, 1997 to Dec. 31, 1998 Jiashi earthquake swarm has greatly affected the nearby tectonic activity and fault slip behavior. In this paper, the observation data of MD model fault deformation monitoring system was used to calculate slip rate of the eastern segment of the Keping fault since 1994. The observation and calculation results show that both the horizontal and vertical slip rates changed obviously after the Jiashi earthquake swarm. The sense of the horizontal slip rate changed from rightlateral strikeslip before it to leftlateral slip after it, and the vertical slip rate was 2 times faster than the old one. The horizontal slip rate was 0.033 mm/a in sinistral sense before the Jiashi earthquake swarm, and 0.016 mm/a in dextral sense after it. The vertical slip rate increased from 0.037 mm/a before it to 0.069 mm/a after it. The stress field also changed after Jiashi earthquake swarm. Although the magnitude of strain rate here remained unchanged, the direction of the principle strain rate rotated 16.7° clockwise.

荆燕，，张世中，熊玉珍，李宏，刘凤秋，孙起伟, 董建业，张鸿旭，王海忠，陈葛天. 柯坪断裂东段现今微动态运动监测与研究[J]. J4.

JING Yan1，2 , ZHANG Shizhong1, XIONG Yuzhen1 , LI Hong1 ,LIU Fengqiu1, SUN Qiwei1, DONG Jianye1 ,ZHANG Hongxu1 ,Wang Haizhong1 ,CHEN Getian1. Monitoring and Research on Micro Kinematics of the Eastern Segment of the Keping Fault[J]. J4.