华北地区的形变信息较弱，计算应变场时应在避免引入系统误差的同时进行精度评定。本文综合采用改进多面函数法和球面整体应变法构建无偏应变计算模型，基于CMONOC的GPS连续站时序数据计算华北中部地区的应变率，根据误差传播率计算相应误差，评估应变率计算的精度和可信度。结果表明，采用基于改进多面函数法和整体球面应变法的无偏应变计算模型计算弱应变地区应变率是可行的，且精度和可信度都较高。

The deformation information in North China is weak. It is necessary to avoid introducing systematic errors but to assess the accuracy in the calculation of the strain field. In this paper, the refined multiquadric function and the spherical integral strain method are used to construct an unbiased strain calculation model. The strain rate of Central North China is calculated based on the CMONOC GPS continuous station velocity data, and the accuracy and credibility of the strain rate are evaluated by the error propagation rate. The results show that it is feasible to calculate the strain rate using the unbiased strain calculation model based on the refined multiquadric function and the spherical integral strain method, and the accuracy and credibility are high.

P315

中国地震局“三结合”课题（CEA-JC/3JH-170311）资助