【摘要】 分析了怀来台体积应变观测资料的特点，研究了体积应变观测资料的气压干扰、仪器漂移的剔除方法和预处理后的资料分析方法，在分析中发现，振幅因子和非潮汐应变速率在 1996 年以来，在首都圈地区中西部发生的中强地震前，均有大小不同、持续时间不等的异常，这些参数可作为怀来地震台今后地震分析和地震中短期预测的指标。更多还原

【Abstract】 The data of volume strain character is analyzed under Huailai station and researched the observation data of the atmospheric pressure disturbance about earth strain, instrument drift about reject method and data analysis method after pretreatment in the paper. It is found that amplitude factor and non-tide stain velocity possesses abnormal of magnitude and duration difference before the moderate strong earthquake occurred at around Beijing area since 1996. These parameters can be regarded an index for the earthquake analysis and mid-short term prediction in the future.更多还原