影响波速异常的两种因素

用超声脉冲法测量了完整岩石样品在三轴实验中不同加载途径下的波速,和拼合岩石样品在单轴实验中的波速。结果表明,应力途径和断层的存在是影响波速异常的两种可能因素。前者既与时间有关,又与空间有关;后者则只与空间有关。为了正确评价波速异常在地震预报中的作用,必须尽可能地阐明影响波速异常的各种因素。

TWO FACTORS INFLUENCING THE ANOMALY OF WAVE VELOCITIES

The wave velocities of whole rock samples in triaxial experiments under different stress paths, and the wave velocities of rock samples with saw cut in uniaxial experiments were measured by ultrasonic impulse method. It is shown that the stress path and the presence of faults are two possible factors influencing the anomaly of wave velocities. The first one is concerned in time and space, while the second one is concerned in space only. It is also shown that for correct evaluation of the significance of the anomaly of wave velocities in earthquake prediction, people must do their best to take into account every kind of factor influencing the anomaly of wave velocities.