体应变观测数据稳定性影响因素

从钻孔体应变仪器安装和标定维护、数据曲线形态及观测精度，对比分析山东省东平、邹城和陵阳地震台体应变观测资料，结果发现：东平地震台观测质量较好，质量最佳月份精度达到0.006 5；陵阳地震台无明显干扰源，精度可达0.01。因钻孔条件不同导致观测精度受到不同程度影响，如：陵阳地震台为节理裂隙较发育的安山岩，相对东平、邹城地震台较完整的花岗岩基精度稍低。

Factors influencing the stability of the volume strain

In this paper, we compare and analyze the observed data of volume strain meter at Dongping, Zoucheng and Lingyang seismic stations. Then, the operation from three aspects-installation, calibration and maintenance of the volume strain meter, the shape of data curve, observation accuracy is analyzed. Analysis shows that the observation at Zouping Seismic Station was in good quality. Its highest monthly accuracy reaches 0.006 5 while the highest monthly accuracy of Lingyang Seismic Station reaches 0.01 due to the absence of disturbance. The accuracy is impacted bythe conditions of holes in different extent. For example, Lingyang Seismic Station is located in andesitic whose cleavage and fracture are well developed while Dongping and Zoucheng seismic stations are located in intact granites, so Lingyang Seismic Station's accuracy is lower than those two.