利用GPS观测研究新疆伽师地区的水平变形特征

Characteristics of Horizontal Deformation in Jiashi Area, Xinjiang Uygur Autonomous Region

推导了利用位移场计算主应变、面膨胀、最大剪应变的公式 ,通过 1 998～ 2 0 0 0年间的两次重复GPS观测结果 ,计算了新疆伽师强震活动区在 1 998～ 2 0 0 0年间的水平主应变、面膨胀、最大剪应变等水平变形特征量的分布 ,分析了 2 0 0 3年发生在该地区的MS6 8级地震与GPS观测计算的变形场特征量之间的分布关系。并从力学理论的角度对该地区的地质构造运动、局部形变特征与地震活动的关系进行了讨论 。

A formula to compute strain through GPS displacement is derived in this paper.The principal strain, superficial expansion and maxium shear strain strain are computed in Jiashi area, Xinjiang Uygur Autonomous Region through GPS displacements observed from 1998 to 2000.The relationship between M S 6 8 earthquake which occurred in Jiashi in February 2003 and the principal strain, superficial expansion and maximum shear strain are discussed and explained by mechanic theory.Some significant conclusions are obtained.