摘要
根据渤海湾区域1999～2013年多期GPS站点速率资料,以营潍断裂带为界分为东西两个地块计算运动参数,求解主应变率和断裂带的应变率。基于应变率计算结果研究了区域应变-应力场。结果表明,1999～2011年渤海湾区域地壳整体受北东东-南西西向压应力和北北西-南南东向张应力作用,2011～2013年区域地壳压应力主方向为近南北向,张应力主方向呈近东西向,致使这一变化的主要原因是2011年日本3.11大地震。渤海湾区域不同地段的应力也存在差异,局部性变化明显。营潍断裂带不同时段的正应变率和剪应变率亦不同,1999～2011年为右旋剪应变-剪应力作用,2011～2013年为左旋剪应变-剪应力作用。
Using Bohai Bay region GPS rate data from 1999 to 2013,Ying-Wei fault zone is divided into two blocks,and we calculate the principal strain rate and the strain rate on the fault zone.The regional strain-stress field calculation results are studied.Results show that the 1999-2011 Bohai Bay regional crust as a whole presents NEE-SWW compressive stress and NNW-SSE tensile stress effect.For 2011-2013,the regional crust presents a N-S direction,tensile stress is nearly in an E-W direction.The main cause of the change is the Japan 3.11 earthquake in 2011.Bohai Bay area is different in localized changes obviously.The Ying-Wei fault zone presents normal strain and the shear strain rates are also different at different times;in 1999-2011 it presents dextral shear strain-shear stress,whereas in 2011-2013 it shows sinistral shear strain-shear stress.
出处
《大地测量与地球动力学》
CSCD
北大核心
2016年第11期985-990,997,共7页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(41472180)
中国地震局地震科技星火计划(XH13037Y)
天津市地震局青年基金(20131021)~~
关键词
营潍断裂带
主应变率
应变-应力场
正应变率
剪应变率
Ying-Wei fault zone
principal strain rate
strain-stress field
strain rate
shear strain rate
