晋中盆地构造变形与地裂缝活动GPS监测分析  

GPS Monitoring Analysis of Crustal Tectonic Deformation and Ground Fissures in the Jinzhong Basin

作　　者：瞿伟[1,2] 张勤[1,2] 王庆良[3] 王利[1,2] 张双成[1,2] 

机构地区：[1]长安大学地质工程与测绘学院,西安710054 [2]西部矿产资源与地质工程教育部重点实验室,西安710054 [3]中国地震局第二监测中心,西安710054

出　　处：《上海国土资源》2012年第3期16-20,共5页Shanghai Land & Resources

基　　金：国家自然科学基金重点项目(40534021);国家自然科学基金项目(40902081;40802075);国土资源部国土资源大调查项目(1212010914015)

摘　　要：基于"数字地震网络工程"2007～2010年GPS监测数据,获取了晋中盆地现今地壳形变特征,并进一步利用椭球面块体应变模型研究了晋中盆地现今地壳应变场特征,据此分析了其与地质灾害发生的内在关系,揭示了盆地内地质灾害多发的成因。研究结果表明:晋中盆地现今地壳整体朝南东向运动,在盆地中部清徐—太谷区域表现出明显的拉张运动;晋中盆地现今地壳应变场整体以NW-SE向拉张为主,其中清徐—太谷、介休是应变高值区也是地震、地裂缝灾害多发区,最大主张应变量达1.8×10-6/a,且区域拉张应变方向与地裂缝呈近似垂直关系,进一步证实了晋中盆地地裂缝的强构造属性。The crustal deformation-strain feature of the Jinzhong basin was analyzed using the ellipsoid block strain model and based on 2007-2010 GPS monitoring data from the digital seismic network project. Using this modeling approach, the relationship between deformation-strain characteristics and geological disasters was analyzed, and the causes of geological disasters in susceptible areas within the basin were also revealed. The results show that the present crustal overall movement of Jinzhong basin is to the southeast and, in the central part of the basin, the Qingxu-Taigu area showed significant extensional movement. The crustal strain field of Jinzhong basin mainly showed tension in the NW-SE direction. Qingxu-Taigu and Jiexiu were high value zones, whilst also earthquake and ground fissure disaster prone areas, and the maximum tension strain value reached 1.8 x 10-6/year. The direction of regional tensional strain is approximately vertical and intersects the strike of ground fissures, which were also strongly attributed to tectonic activity in the Jinzhong basin.

关 键 词：晋中盆地 地壳构造应变场 地震 地裂缝 GPS形变监测 

分 类 号：P227[天文地球—大地测量学与测量工程] P228.42[天文地球—测绘科学与技术]