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针对当前主流单维度地应变分析方法难以全面反演地壳动态迁移及其趋势,无法精确反映应变与地震相关性的问题,该文提出利用多维参量解析法进行全方位地壳应变分析。利用2011—2014年GAMIT解算得到的高精度GNSS坐标时间序列经过模型化拟合得到的ITRF08框架下的川滇地区速度场,并去除欧亚板块欧拉矢量速度场进行Delaunay三角形构网,解算得到了川滇地区的主应变率场、最大剪切应变率场、面膨胀率场。研究结果表明,最大剪切应变率高值区域及面膨胀率梯度较大区域与地震的发生存在较强的相关性,地壳动态迁移趋势性体现比以往常规研究显著占优;多维参量解析法从更丰富的数据维度反演了川滇区域地壳活动状态。
In view of the fact that it is difficult to fully invert the dynamic crustal migration and its trend by analyzing the current mainstream single-dimensional strain analysis methods, it is impossible to accurately reflect the correlation between the strain and the earthquake. In this paper, the multi-dimensional parametric analysis method is used to analyze the crustal strain in all directions. The high-precision GNSS coordinate time series obtained by GAMIT solution from 2011 to 2014 are modeled and fitted to the velocity field in Sichuan-Yunnan region under the ITRF08 framework. The Delaunay triangulation of the Eurasian vector velocity field is removed Calculate the main strain rate field, the maximum shear strain rate field and the area expansion rate field in Sichuan-Yunnan region. The results show that there is a strong correlation between the maximum shear strain rate and the area with large surface swell gradient and the occurrence of earthquakes. The tendency of the dynamic migration of the crust is obviously better than the conventional research. The multi-dimensional parametric analysis Raster data inversion of the crustal activity in the Sichuan-Yunnan region.