伊通——舒兰断裂带的演化过程及其邻近地区地震危险区的模拟

EVOLUTION OF THE YITOKG-SHULAN FAULT ZONE AND MODELLING ON EARTHQAKE RISK DISTRICK

本文主要讨论了伊舒带的主要特征及其发展演化的历史过程。作者认为,晚期伊舒断裂带是郯庐断裂带的一个分支断裂,它经过了长期而复杂的演化过程,根据力学性质和活动方式的演变,演化过程被划分为四个阶段:最初是左旋剪切断裂,其后演变为压性断裂,第三期是右旋剪切断裂,最后形成右旋张剪性断裂。文中对最新期应力场进行了模拟,获得了伊舒断裂带邻近地区能量等值线 图和能量集中区,根据实验结果和历史地震资料对地震危险区进行了划分。

The Yitong-shulan fault zone is situated in the middle of Jilin province, it is a branch of the Tancheng-Lujiang fault zone, a large fault zone in eastern China.The Yitong-Shulan fault zone has a long and complex history, since the palaeozoic its evolution has been controlled by stress field, and involved four stages of development characterized respectively by left-lateral shear,nermal compression, rightlatsral shear and right-lateral shear-tensile movements with the later resulting in the present rift.The strain energy of recent stress field is measured experimentally, the strain energy concentration districts are obtained through modelling. According to the energy order earthqake risk districts are divided.