新疆南天山地区重力场动态演化特征

The Dynamic Evolution Features of Gravity Field in Southern Tianshan Area, Xinjiang

摘要:

通过分析南天山地区2005-2008年近8期流动重力测量资料,研究了重力场的时空动态演化特征,提取与地震活动有关的信息,并对重力场变化与构造活动及地震活动的关系进行了探讨。结果表明:重力场变化与构造环境变化有关;地震孕育发生阶段重力场出现一定范围的区域性重力异常;地震往往多发于重力场变化正负值交替的零线附近。

Abstract:

Through analysing the mobile gravity measurement dada of last 8 times from 2005 to 2008 in Southern Tianshan area, Xinjiang Region, the spatial and temporal dynamic evolution characteristics of gravity field in this area are studied, the information related with seismisity is extracted, and relationship among the variation of gravity field, tectonic activity and seismic activity are discussed also. The result shows that the changes of gravitational field relate to the changes of tectonic environment. In the earthquake pregnant stage, some regional anomalies of gravity appear in a certain range. Earthquake often occurres near the zero line of gravity contours.