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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
Introduction After the publication of the data on gravity changes in Tangshan earthquake, it has attracted the attention of scholars at home and abroad. Some commenters believe this information is very valuable. However, the observational accuracy of the CG-2 gravimeter used before the Tangshan earthquake was not high, and some comments questioned the reliability of the observed data. The main points are as follows: (1) The gravity changes before the Tangshan earthquake The magnitude is greater than the magnitude of the pre-quake gravity change currently recognized in the world. The currently accepted pre-earthquake gravity change is generally less than 100 microgas, and its variation is related to elevation changes. The ratio of gravity change to elevation variation fluctuates within the Bouguer gradient-space gradient. (2) quartz spring gravimeter pressure variation