摘要
利用"中国大陆构造环境监测网络"南天山区域2015~2019年GNSS观测资料解算得到南天山区域地壳运动速度场,并应用最小二乘配置法则计算区域应变场,南天山区域地壳运动速率不均匀,西高东低,南高北低。在盆山交接的柯坪断裂区域地壳运动速率下降加剧,断裂吸收蓄积能量。应力场结果反映出南天山区域整体处于压缩环境,区域剪切应变西高东低。伽师M_(S)6.4地震震中位置处于断裂折转位置,震中断层东西区域地壳速率存在差异。
Crustal movement velocity field in South Tianshan region from 2015 to 2019 is calculated by GNSS data from the Chinese mainland tectonic environment monitoring network,and the least squares collocation rule is used to calculate the regional strain field.The velocity of the crustal movement in South Tianshan is uneven,the West is high while the East is low,and the South high while the North low.In the Keping fault area at the junction of mountain and basin,the rate of crustal movement decreases and accelerates,and the fault absorbs and accumulates energy.The stress field results show that the South Tianshan region is in a compressive environment,and the regional shear strain is high in the West and low in the East.The epicenter of Jiashi M_(S)6.4 earthquake is at the fault turning position,and there is a difference in crustal velocity between the East and west regions of the epicenter fault.
作者
朱治国
刘雷
高荣
李桂荣
ZHU Zhi-guo;LIU Lei;GAO Rong;LI Gui-rong(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China;The Second Monitoring Center,CEA,Xi'an 710054,Shaanxi,China)
出处
《内陆地震》
2021年第4期354-362,共9页
Inland Earthquake
基金
2020年自治区创新环境(人才、基地)建设专项—自然科学计划(2020D01A85)
中国地震局三结合课题(3JH-202002024)
自治区重点研发计划项目(2020B03006-2)。
关键词
陆态网络
南天山
构造应变场
速度场
CMONOC
South Tianshan
Tectonic strain field
Velocity field
