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前驱波是一种暂态信号,是在震源成核过程中发射出的一种低频波,对地震预测而言是一种有重要价值的可靠短临前兆信息。本文提取了黑龙江及邻区3次中强地震前5例水位、竖直摆倾斜数字化低频前驱波异常图像,分析了低频前驱波异常形态、异常特征和异常指标,经初步统计得到了经验公式,探讨了前驱波异常机理,取得了一些新的认识,值得一提的是这些震例均为近场区中强地震前数字化前兆低频前驱波异常,丰富了低频前驱波方法在黑龙江地区地震分析预测工作中的应用。
The precursor wave is a kind of transient signal, which is a kind of low frequency wave emitted in the process of nucleation. It is a reliable short-term precursor information of great value for earthquake prediction. In this paper, we extracted five anomalous images of water level and vertical pendulum digitized low frequency precursor wave before three moderate-strong earthquakes in Heilongjiang and its adjacent areas, analyzed the anomalous morphology, anomaly characteristics and anomaly indexes of the low frequency precursor wave and obtained the empirical formula through preliminary statistics. The mechanism of anomaly of precursor wave is discussed and some new understandings are obtained. It is worth mentioning that these cases are all anomalous precursors of digital precursory low-frequency precursors before moderate-strong earthquakes in near-field region, which enriches the prediction and prediction of low-frequency precursor wave in the seismic analysis of Heilongjiang region Application in work.