昌平台Sacks体应变仪观测曲线年变现象成因研究

本文系统地研究了北京昌平台Sacks体应变仪观测曲线年动态变化的基本规律，结合井水位、抽水和降雨等实际观测资料，分析后认为，台站附近农田机井季节性抽水和地下水的自然补给是造成体应变年变现象的根本原因，并探讨了体应变与井水位的定量关系和物理机制，同时对地震预测中所关心的“破年变”问题也进行了探讨。

Research on Annual Variation Reason of the Sacks Volumetric Strain

This paper systematically studied the basic law of the Sacks volumetric strain annual varialion at the Changping station,Beijing. On the basis of the well water level, pumping and rainfall data, the reason of annual variation about volumetric strain is proved. It is produced by nearby farmland machine well seasonal pumping and grounder water supply. They discussed the quantitative relation between volumetric strain, well water level and physical mechanism of pumping influence.In earthquake prediction, the helpful opinion that the annual variation changed is posed.