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本文首先选择在我国具有代表意义的唐山地震前后流动重力观测资料,通过严格的数学处理,分析了系统误差与偶然误差,重力场的短期变化与长期变化。认为河北局重力组所作关于震前短期变化的结论还值得进一步研究。关于自71年至75年存在着长期变化的结论是可信的。提出了观测布网工作应当改进的一些意见。在此基础上根据实测重力场和模型重力场计算了重力位等位面的变化,研究了重力场变化与地壳形变的相互影响。结果表明无论对重力测量还是形变测量此项影响都是不能忽视的;唐山地区地震前地球内部的物质活动,地壳的实际形变要比重力、水准实测数据所反映的更为剧烈。
In this paper, we first select the observational data of mobile gravity before and after the Tangshan earthquake in our country, and analyze the short-term and long-term changes of systematic errors, accidental errors and gravitational field through rigorous mathematical processing. It is worth further investigation that the conclusion made by Hebei Bureau gravity group on short-term changes before the earthquake is worth further study. The conclusion about the long-term changes between the years 71 and 75 is credible. Put forward some suggestions on how to observe the work of cloth network improvement. On this basis, the change of gravitation bit plane is calculated according to the measured gravitational field and model gravitational field, and the interaction between gravitational field changes and crustal deformation is studied. The results show that this effect can not be neglected both in gravimetric measurement and in deformation measurement. Before Tangshan earthquake, the physical activity of the Earth’s interior and the actual deformation of the crust are more severe than the gravitation and leveling data.