最小二乘配置的云南区域形变与应变特征研究Study on deformation and strain characteristics of Yunnan region based on least square configuration
徐良叶,邵德盛,吴学群,牛甜
摘要(Abstract):
针对根据陆态网络区域网联测资料来构建速度场复测周期长、不能连续地观测到地壳区域的形变与应变变化的问题,该文利用GAMIT/GLOBK软件解算2015—2019年云南区域45个连续运行GNSS基准站观测数据,得到云南区域在ITRF2014框架下的速度场,进一步获取云南区域整体旋转无基准的速度场,然后利用克里金插值方法对站点的速度进行插值,再利用最小二乘配置法求取云南区域应变场,实时动态地监测云南地区形变与应变变化。结果表明,站点的实测速度与拟合速度的残差大部分在1 mm以内(除1个站点残差为1.3 mm外),说明本文计算方法的有效性与可靠性。从获取的云南区域应变参数可以看出,云南区域面膨胀率总体呈现拉张与压缩相互交替的现象,说明云南区域地壳所受到的应力复杂,构造运动活跃,其中拉张应变最突出的地方在木里-盐源一带,压缩应变最突出的地方在通海-蒙自一带;云南区域最大剪应变主要有2个高值区,分别沿丽江-小金河、小江断裂带分布,其中最大剪应变高值区在昆明-通海一带,其他区域剪切应变积累低,说明剪切变形较弱。
关键词(KeyWords): GNSS;云南;形变;应变场
基金项目(Foundation): GNSS数据分析与预报创新团队项目;; 云南省地震局地震科技专项基金(2017ZX03)
作者(Author): 徐良叶,邵德盛,吴学群,牛甜
DOI: 10.16251/j.cnki.1009-2307.2021.12.003
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