Abnormal infrasonic signals can be observed within a few days before a strong earthquake. Infrasound conveys information about the size and growth of the crack. To date, however, most studies have used infrasonic intensity as the basic parameter for earthquake monitoring. Based on observations, the current study simulated the time parameter of the acoustic elastic waves during deformation and catastrophic events caused by the evolution and accumulation of geological body fractures before an earthquake. The quantitative relations between the length of the pulse front edge and the scale and growth velocity of the crack indicated that the length of the pulse back edge was associated with the size of the deloading zone. The existence of the undeformed acoustic pulse when the crack occurred indicated the consistency between the length of the front edge and the growth time of the crack. The characteristics of acoustic abnormalities might be a direct reflection of fracture severity, whose variations can characterize the occurrence of the main fracture. As the precursor of an earthquake, acoustic abnormalities can be considered as key data in simulations of earthquake prediction.

在强震前几天可以观察到异常次声信号。次声传达有关裂缝大小和增长的信息。然而，迄今为止，大多数研究都使用次声强度作为地震监测的基本参数。本研究在观测的基础上，模拟了地震前地质体裂缝演化和积累引起的变形和灾难性事件中声弹性波的时间参数。脉冲前缘长度与裂纹规模和扩展速度的定量关系表明脉冲后缘长度与卸荷区的大小有关。裂纹发生时未变形声脉冲的存在表明前缘长度与裂纹扩展时间的一致性。声学异常的特征可能是裂缝严重程度的直接反映，其变化可以表征主裂缝的发生。作为地震的前兆，声学异常可以被认为是地震预测模拟中的关键数据。