文章摘要

文章信息/Info

Title:: The comparative analysis of block strain calculation formulas based on different reference surfaces

Author(s):: WU Yan-qiang¹; JIANG Zai-sen¹; YANG Guo-hua²; (1.Institute of Earthquake Prediction,CEA,Beijing 100036,China)(2.First Crustal Monitoring and Application Center,CEA,Tianjin 300180,China)

Keywords:: Gauss projection; Lambert projection; survey adjustment; simulation data; difference statistics; block strain

摘要:: 通过对不同块体应变计算公式的分析,利用模拟数据作为输入、采用经典平差方法求解应变参数并评定精度,进而对比不同参考面块体应变计算公式的差异。同时对小样本和大样本模拟数据应变计算结果进行统计分析。结果表明,平面公式与球面公式计算结果的差异与计算区域的大小有关,由投影误差决定,与点位的纬度分布没有必然的联系。因此,在小区域进行应变计算不会因为公式不同而导致结果的系统性差异。

Abstract:: On the analysis of the different block strain calculation formulas,the classic adjust method is used to calculate the strain parameters and their errors using simulation data,and then the difference of these formulas based on different reference surfaces are compared.In this paper,the statistics results are analyzed based on the simulation data of small samples and large samples,and the results reveal the outcomes of these formulas are identical in small area.Their differences are related to the area of region,which are decided by projection error,and they do not relate to the latitude distribution.So,the strain results obtaining from different formulas in small region do not have systemic difference.