山西地震重力监测网起算基准扰动分析

Analysis of Disturbance from Calculation Datum for the Regional Gravity Network of Shanxi Province

在精细处理山西省地震重力监测网全部观测资料的基础上,研究了经典平差中起算基准的稳定性及其对平差结果的干扰。采用最小二乘拟合方法,消除了起算基准对区域重力场动态变化的影响。结果表明:2010年山西阳曲地震前后的重力异常明显,反映了地震孕育的基本信息。因此,在处理地震重力监测资料和分析地震重力异常时必须修正起算基准的干扰。

On the basis of fine processing of all the observation data of Shanxi regional gravity network,the stability of calculation datum in the classic indirect adjustment are studied.Least squares method are used to study the disturbance from calculation datum of Shanxi regional gravity network.After the disturbance from calculation datum is corrected,the evolution characteristics of dynamic gravity field changes in the seismogenic region become more obvious.Thus the disturbance from calculation datum must be calculated and considered when conventional gravity network data are processed and analyzed.