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Monitoring contact state of laboratory fault by coda transmission waves
谢凡
中国地震局地球物理研究所
摘要:
本文利用主频500kHz的跨断层超声尾波的幅度变化监测了1.5米长实验室模拟断层在正应力保持实验中的断层面摩擦状态的变化。 我们发现跨断层传播的尾波能力最大幅值随着接触时间呈现对数型关系。 同时我们还发现接触1小时后尾波幅度的增长量在断层不同位置存在从4%-16%的差异。 我们讨论了在细观尺度上断层的摩擦特性的改变可能是尾波幅度变化这一可能的原因。 利用我们的方法并结合其他辅助的观测手段可在实验室尺度或野外观测中增加对断层摩擦过程的理解。
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Monitoring contact state of laboratory fault by coda transmission waves
xiefan
Institute of Geophysics, China Earthquake Administration
Abstract:
We monitor the amplitude changes of coda transmission waves at 500 kHz across the frictional interface of simulated 1.5 meters long fault during normal stress holding test. We find that the amplitude of coda transmission waves increased with the logarithm of stationary contact time. Localized increase amounted range from 4% to 16% across the fault is observed after about 1-hour experiment. We discuss the frictional strength at mesoscopic scale which related the amplitude of coda transmission waves, is responsible for this phenomenon. Combining the reported method with other complementary approaches will allow to enhance the understanding fault mechanism either at laboratory or on-site applications.
Key words:  coda transmission waves, laboratory fault, frictional contact area