珠峰区域现今地壳运动特征分析  

Analysis of current crustal movement characteristics in Everest region

作　　者：孙洋洋 杨强[2] 程传录 蒋光伟 王斌[1] 陈雄川 SUN Yangyang;Yang Qiang;CHENG Chuanlu;JIANG Guangwei;WANG Bin;CHEN Xiongchuan(Geodetic Data Processing Center of Ministry of Nature Resources,Xi’an 710054,China;Chinese Academy of Surveying and Mapping,Beijing 100036,China;School of Geological Engineering and Geomatics,Chang’an University,Xi’an 710054,China)

机构地区：[1]自然资源部大地测量数据处理中心,西安710054 [2]中国测绘科学研究院,北京100036 [3]长安大学地质工程与测绘学院,西安710054

出　　处：《导航定位学报》2022年第4期169-175,共7页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(41574003,41904040);2019年度自然资源部高层次科技创新人才培养工程杰出青年人才资助项目(12110600000018000000);2020年度陕西测绘地理信息局科技创新项目(sck2020-05)。

摘　　要：针对珠峰区域南北坡复杂的地壳运动特征,提出通过分析全球卫星导航系统(GNSS)连续观测数据获得的高精度速度场及空间基线时间序列运动特征,来揭示该区域的运动趋势。结果表明:该区域自西向东表现出北东、东、东南的顺时针旋转趋势,区域西部的速率为36 mm/a、中部及东部速率为47 mm/a,同时得出不同时间跨度的结果具有较好的一致性和连续性的结论,基于无旋转地学板块运动模型(NNR-NUVEL-1A),获得了扣除整体板块运动后的珠峰区域速度场,反映出印度板块以北东方向、角度20~30°,35 mm/a的速率推挤欧亚板块,在穿过喜马拉雅主逆冲带后,速率减小为27mm/a。同时从珠峰区域南北坡基准站间的空间关系运动特征得出,超过66%的基线分量在南北方向表现为缩短、65%在东西方向表现为拉伸且具有明显的方向性,63%的基线长度表现为缩短趋势,且此特征在北坡、南坡及跨断裂带基线中均表现明显。通过速度场和基线空间运动关系两方面均得出,珠峰区域南北方向运动特征为凝聚;东西方向为拉伸。In view of the complex crustal movement characteristics of the North-South slope of Everest region,it is proposed to review the movement trends of this region by analyzing the high-precision velocity field and spatial baseline time series movement characteristics obtained from the continuous observation data of Global Navigation Satellite System(GNSS).The results show that the region shows a clockwise rotation trend of North-East、East、East-South from west to east,the rate of the western part of the region is 36 mm/a,and the rate of central and eastern is 47 mm/a,the results over different time spans have good consistency and continuity.Based NNR-NUVEL-1A model,the regional velocity field of Everest after deducting plate motion is obtained,which reveals that the Indian plate pushes the Eurasian plate in the direction of North-East 20-30°,at the rate of 35mm/a,the velocity decreases to 27 mm/a after crossing the Himalayan main thrust belt.At the same time,according to the movement characteristics of spatial relationship between reference stations of Everest region,more than 66%of the baselines shown shortening in the direction of north-south,65%of the baselines shown stretching obviously in the east-west direction,and 63%of the baseline length shown shortening trend,and this feature is obvious in the north slope,south slope,and cross fault zone baselines.Both the velocity field and the baseline spatial motion show that the North-South movement of the Everest region is characterized by condensation,and the East-West movement is characterized by stretching.

关 键 词：珠峰区域 速度场 基线空间关系 全球卫星导航系统 

分 类 号：P228[天文地球—大地测量学与测量工程]