湖北地区现今地壳运动的GPS监测与分析  

Analysis of Present-Day Crustal Deformation in Hubei by GPS Observation

作　　者：聂兆生[1,2] 熊维[1,2] 黄勇[1,2] 

机构地区：[1]中国地震局地震研究所(地震大地测量重点实验室),武汉市480071 [2]中国地震局地壳应力研究所武汉科技创新基地,武汉市430071

出　　处：《大地测量与地球动力学》2016年第10期922-926,共5页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震研究所所长基金(IS201326129);中国地震局地震行业科研专项(201508003,201508009);国家自然科学基金(41504011,41572354)~~

摘　　要：利用GAMIT/GLOBK软件处理湖北CORS网络、陆态网络等76个连续站2011-05~2013-06的GPS观测数据,得到各测站的精确坐标及测站的时间序列。给出全部测站的水平速度场,各测站的运动速度为6~9mm/a,运动方向以东向或东南向为主,与华南块体的运动特征基本一致。初步结果表明,湖北地区内部不存在明显的差异运动。同时,计算了湖北地区的主应变率、最大剪应变率。结果表明,湖北地区最大剪应变率敏感区主要分布于断裂带集中的地区,分别位于巴东、秭归和郧县-竹山附近,最大值约为(1.43~1.73)×10^(-7)/a,这一结果与湖北2014年秭归发生的4.5级、4.7级地震以及2014年房县4.0级地震有明显的对应关系。In this study, we calculate GPS observation data from 76 continuous sites between May 2011 and June 2013 of the CMONOC and HBCORS networks. We get the precise coordinates, the time series, and the horizontal movement velocity field of each station. The results show that the movement speed is about 6-9 mm/a, and gives priority to movement to the east or southeast direction, which is almost the same as the movement characteristics of the south China block. The preliminary results show that there is no obvious difference in the Hubei region. Also, we calculate the principal strain rate and the maximum shear strain rate. The results show that the maximum shear strain rate sensitive area is mainly the area where the faults distribute centrally; the maximum value mainly distributes in Badong, Zigui and Zhushan-Yunxian and its neighbor area; the value is about （1.43-1.73） × 10 -7/a, ,the results correspond obviously to Zigui M4. 5 and M4. 7 earthquakes, and Fangxian M4.0 earthquake in Hubei region in 2014.

关 键 词：GPS速度场 时间序列 主应变率 最大剪应变率 

分 类 号：P315[天文地球—地震学]