摘要
利用1999～2009年汾渭断裂带GPS速度场观测资料,研究了跨断裂剖面变形动态演化特性、应变积累的分段差异性以及汶川大地震等的可能影响。结果表明:近10年来山西断陷带南段、渭河盆地中东部应变积累相对较快,山西断陷带北端的蔚广盆地南缘断裂、渭河断裂西段也存在一定程度应变积累。汶川大地震影响相对明显,2007～2009年应变积累明显增强的有渭河断裂西段、山西断陷带南段和蔚广盆地南缘断裂。
Using velocity-field data observed by GPS from 1999 to 2009 in the Fen-Wei Fracture Belt, we study the features of the dynamic evolution of the cross-fracture section deformation, the difference of strain accumulation between fracture segments, and the possible influence of the Ms8.0 Wenchuan Earthquake on the Belt. The result shows that in recent 10 years, the southern segment of the Shanxi Fracture and the middle-eastern Weihe Basin displayed relatively faster strain-accumulation, the southern margin fault of the Weiguang Basin and the western segment of the Weihe fracture also existed strain accumulation to some extent. All these variation obviously resulted from the Wenchuan Earthquake. From 2007 to 2009, the strain accumulation increased in the western segment of the Weihe Fracture, the southern segment of the Shanxi Fracture and the southern fault in the margin of the Weiguang Basin.
出处
《地震研究》
CSCD
北大核心
2011年第4期504-510,共7页
Journal of Seismological Research
基金
2011年度陕西省科学技术发展计划项目"汾渭断裂带地壳运动的非均匀负位错模拟与应变积累研究"(2011JM5016)
国家自然科学基金项目"汶川大震对应变积累的影响研究"(40974005)共同资助
关键词
GPS
剖面变形
应变积累
大震影响
汾渭断裂带
GPS
section deformation
strain accumulation
influence of great earthquake
the Fen-WeiFracture Belt
