【摘要】 <正> 引言 唐山地震重力变化资料发表后,受到国内外学者的关注,一些评论认为此资料十分宝贵。但由于在唐山地震前所使用的CG-2型重力仪的观测精度并不很高,也有一些评论对观测资料的可靠程度提出质疑,主要有以下几点: (1)唐山地震前重力变化的量级大于目前世界上所公认的震前重力变化的量级。目前公认的震前重力变化一般小于100微伽,且其变化与高程变化有关。重力变化与高程变化之比在布格梯度——空间梯度范围内波动。(2)石英弹簧重力仪存在气压变化影更多还原

【Abstract】 In combination with the experimental results obtained by various instruments in recent years and the results from analyses of different interference factors, such as ground water level changes, elevation variations, temperature and air presure, a strict formulation is used for recalculating the gravity data measured in the Tangshan earthquake region during the ten years before and after the Tangshan shock. It has been shown that the gravity changes before the Tangshan shock are objective.On the basis of recently obtained levelling data, some new ideas about the gravity variations after the said shock are given.更多还原