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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低频波,可能是一种有价值的短临前兆信息。选取功率谱、傅里叶谱和边际谱分析方法,对黑龙江及邻区3次中强地震前,水位和竖直摆倾斜共5次低频前驱波异常进行分析,给出水位和竖直摆倾斜低频前驱波频谱特征,丰富了3种前驱波信息提取方法在黑龙江及邻区的应用。
The precursor wave is a transient signal that is a low-frequency wave emitted during the nucleation of a source and may be a valuable short-term precursor information. The power spectrum, Fourier spectrum and marginal spectral analysis were used to analyze the anomalies of five low-frequency precursors before and after the three moderate-strong earthquakes in Heilongjiang and their adjacent areas. The water level and vertical tilt were given The low-frequency precursor wave spectrum features enrich the application of three kinds of precursor wave information extraction methods in Heilongjiang and its neighboring areas.