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地声是一种具有非稳态特征的地球物理信号，分析其谱特征时须有别于稳态信号．本文以位于郯庐断裂带中段上的深井中所捕捉到的地声信号为例，用Ｗｉｇｎｅｒ分布对地声信号作时－频谱分析．结果表明，地声信号的能量主要分布在１００．００～１７０．００Ｈｚ范围；临近破裂时，频率以高频为主，谱峰数增加；至破裂时频率降低，以低频为主，之后又以高频成份占优势．地声信号的谱特征与断裂所处的构造应力状态、断裂面岩性、声发射传播途径等因素有关
Geo - sounding is a geophysical signal with unsteady features that is different from steady - state signals when analyzing its spectral features. In this paper, the ground acoustic signal captured in a deep well located in the middle section of the Tan-Lu fault zone is taken as an example to make a time-frequency analysis of the ground acoustic signal using the Wigner distribution. The results show that the energy of the ground acoustic signal is mainly distributed in the range of 100.00-170.00 Hz. When the neighboring rupture occurs, the frequency is dominated by high frequency and the peak number of the spectrum is increased. The frequency is reduced to rupture, mainly at low frequencies. High-frequency components prevail. The spectral characteristics of the ground acoustic signal are related to the tectonic stress state, the lithology of the fracture surface and the route of acoustic emission transmission