摘要
在精细处理龙门山区域重力网全部观测资料的基础上,采用相关统计分析方法,研究了经典间接平差中起算基准的稳定性以及对平差结果的干扰,修正了起算基准扰动影响后的重力场变化结果表明:汶川地震前的龙门山区域重力场异常明显,特征性强。因此,在处理和分析常规区域重力网资料时必须顾及起算基准的稳定性问题。
On the basis of fine process of all the observation data of Longmenshan regional gravity network, the analysis method of statistic correlation is used to study the stability of the calculation datum in the classic indirect adjustment and its disturbance on adjustment results. The gravity changes in which calculation datum disturbance is corrected show that the gravity anomalyl before Wenchuan earthquake is obvious and its characteristics is distinctive. Thus the stability of calculation datum must be considered when conventional regional gravity network data are processed and analyzed.
出处
《大地测量与地球动力学》
CSCD
北大核心
2009年第6期8-12,共5页
Journal of Geodesy and Geodynamics
基金
地震科学联合基金(A07030)
中国地震局地震研究所所长基金(IS200861358)
关键词
区域重力网
经典间接平差
起算基准
重力场异常
汶川地震
regional gravity network
classic indirect adjustment
calculation datum
gravity anomaly
Wenchuan Ms8. 0 earthquake
