| 摘 要： | The experimental study of the change of wave velocity in fault regions before instability of frictional sliding of rocks was conducted.Experiments show that before the instability of frictional sliding of rocks,the change of wave velocity cannot be observed along lines on one side of the fault,but the precursor of the decrease of wave velocity can be observed along lines across the fault.Therefore,when we try to predict the earthquakes of the stick-slip type in fault regions by using the anomaly of wave velocity,the measuring lines across the faults should be selected.
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