摘要
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。
It＇s hard to analyze the crustal motion comprehensively, especially in the relationship of earthquakes and strain by single dimension method. In order to give a richer inversion to crustal activity, multi-strain parameter dimension was proposed to analyze the crustal strain in this paper. The main strain filed, maximum shear strain rate field and area expansion ratio were calculated after the Delaunay triangle configuration in Sichuan-Yunnan area. The velocity field under ITRF08 was calculated and modeled fit by the high precision GNSS coordinate time series. The results showed that there was a strong correlation between the maximum shear strain rate and the large area of the regional expansion ratio under earthquakes analysis, as well as the migration of motion. The method of multi-strain parameter analysis showed more information about crustal activity.
出处
《测绘科学》
CSCD
北大核心
2016年第10期53-57,152,共6页
Science of Surveying and Mapping
基金
国家自然科学基金项目(41374033)
