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从2012年下半年至2013年初,丰满台垂直摆倾斜观测北南分量出现较为明显的破年变异常。通过对丰满台垂直摆仪器工作状态的检查、观测环境的调查、仪器自身原因的排查,并且利用数学回归模型分析、倾斜矢量图异常性质分析及历史观测资料分析来判定丰满台垂直摆资料的异常。综合分析认为,此北南向破年变和东西向反向西倾的异常属于2013年10月31日吉林松原5级中强震群的前兆异常。
From the second half of 2012 to the beginning of 2013, the north-south component of the vertical pendulum tilt observation in Fengman Station showed a more obvious annual variation. Through the investigation of the working condition of the vertical plumbing instrument, the investigation of the survey environment and the investigation of the cause of the instrument itself, the abnormality of vertical plumbness information of the plump massif is determined by the mathematical regression analysis, the analysis of the anomalous nature of the inclined vector and the analysis of the historical observation data . According to the comprehensive analysis, the anomaly of the north-south breaking anomaly and the east-west reverse west-dip belongs to the precursor anomaly of the M5-3 moderate-strong earthquake swarm on October 31, 2013 in Jilin Province.