基于精密水准的鄂尔多斯西北缘现今垂直运动分析  

Current Vertical Motion Analysis of Northwestern Margin of Ordos Based on Precise Leveling

作　　者：郭宝震[1] 塔拉[1] 周海涛[1] 苏广利[1] Guo Baozhen Ta La Zhou Haitao Su Guangli(First Crust Monitoring and Application Center, CEA, Tianjin 300180, China)

机构地区：[1]中国地震局第一监测中心,天津300180

出　　处：《震灾防御技术》2017年第3期523-528,共6页Technology for Earthquake Disaster Prevention

基　　金：中国地震局第一监测中心主任基金(FMC2014001);中国综合地球物理场观测-大华北项目(201508009)

摘　　要：鄂尔多斯块体受青藏块体和华北块体的挤压,在其周缘形成一系列褶皱和压性断层,构造较为复杂。本文利用1980、1990和2014这3期精密水准资料计算了鄂尔多斯块体西北缘的垂直运动速率,分析结果表明:(1)位于阴山断块隆起与鄂尔多斯断块隆起之间的河套盆地相对下沉,其中临河盆地最为明显,下沉速率为2—4mm/a,位于鄂尔多斯块体西缘的吉兰泰-银川断陷带沉降速率有所减缓,目前沉降速率约为2mm/a;(2)整个测区表现为明显的山区上升、盆地下沉的继承性运动;(3)穿过乌拉山北缘断裂和磴口-本井断裂的2条水准剖面显示断裂两侧的垂直运动速率差异小于0.5mm/a。Ordos block was squeezed by the Qinghai-Tibet an block and North China block, and the tectonic activity was intense. In the periphery of Ordos block, there was a series of wrinkles and compressive faults with complex constructure. This paper used three-phase data of 1980, 1990 and 2014 to calculate vertical velocity of northwestern margin of Ordos and the analytical results indicated that （1）the Hetao basin between the rise of Yinshan fault block and Ordos fault block relatively sank, in which Linhe basin was the most evident and the sink rate was about 2--4mm/a. The sink rate of Jartai - Yinchuan rift zone on the western margin of Ordos block slowed and the sink rate was about 2mm/a; （2） the whole testing zone exhibited the evident inherited movement characterized by mountain rise and basin sinking; （3）the two leveling section through the northern margin fault and Dengkou-Benjing fault showed that the difference between vertical velocities flanking fault was less than 0.5mm/a.

关 键 词：精密水准 鄂尔多斯 断裂 垂直运动速率 

分 类 号：P315.2[天文地球—地震学]