摘要
利用2009—2010年四川及其邻区GPS水平运动速度场资料,参考2004—2007年、2007—2008年相应结果,借助形变应变场分析与非震负位错反演,研究活动断裂带近期应变积累特性、分区分段差异性,以及汶川、玉树大震影响和演变情况。结果表明:1)汶川大震影响大幅减弱但未完全结束,尤其龙门山断裂区及其南北两端附近;2)玉树地震对监测区影响偏弱;3)鄂尔多斯西南缘及甘青川-甘川-甘川陕交界区、川滇交界东部、滇西北至川滇交界目前具备、维持强震孕育背景。
Using horizontal velocity data observed by GPS in 2009-2010 in Sichuan and its nearby areas,referring to relevant results in 2004-2007 and 2007-2008,with the aid of analysis of deformation-stain field and inversion of negative dislocation,the features of recent strain accumulation of active faults and their difference between different regions and different segments and together with the evolution of influence from the Wenchuan and Yushu earthquakes are researched.The results are as follows.1）Influence from the Wechuan earthquake decreased obviously but had not ended,at the Longmenshan fault and its two ends especially.2）Weaker influence from the Yushu earthquake was observed.3）At present,these regions had background of strong earthquakes,i.s.,the southwestern margin of Ordos,boundary of Gansu-Qinghai-Sichuan and Gansu-Sichuan and Gansu-Sichuan-Shannxi,eastern boundary between Sichuan and Yunnan,from the northwestsen Yunnan to the boundary between Sichuan and Yunnan.
出处
《大地测量与地球动力学》
CSCD
北大核心
2011年第5期9-13,共5页
Journal of Geodesy and Geodynamics
基金
陕西省科学技术发展计划(2011JM5016)
关键词
GPS
负位错反演
运动速度
应变场
强震
GPS
negative dislocation inversion
movemental velocity
strain field
strong earthquake
