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  郭宝震,塔拉,周海涛,苏广利.基于精密水准的鄂尔多斯西北缘现今垂直运动分析[J].震灾防御技术,2017,12(3):523-528, DOI:10.11899/zzfy20170308.

基于精密水准的鄂尔多斯西北缘现今垂直运动分析
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。
作者单位
郭宝震 中国地震局第一监测中心, 天津 300180 
塔拉 中国地震局第一监测中心, 天津 300180 
周海涛 中国地震局第一监测中心, 天津 300180 
苏广利 中国地震局第一监测中心, 天津 300180 
关  键  词:精密水准  鄂尔多斯  断裂  垂直运动速率
DOI:10.11899/zzfy20170308
基金项目:中国地震局第一监测中心主任基金(FMC2014001)和中国综合地球物理场观测—大华北项目(201508009)
收稿日期:2017-02-10
作者简介:郭宝震,男,生于1976年。工程师。主要从事大地形变测量与工程形变监测技术与应用。E-mail:13302117792@163.com
通讯作者:
Current Vertical Motion Analysis of Northwestern Margin of Ordos Based on Precise Leveling
Abstract:      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 ①the 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; ③the 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.
Keywords:  Precise leveling  Ordos  Fault  Vertical velocity
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