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Monitoring Contact State of Laboratory Fault with Coda Transmission Waves
XIE Fan, REN Yaqiong, HOU Jinxin
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
摘要:
We monitored the amplitude changes of coda transmission waves around 500kHz across the frictional interface of a simulated 1.5-meter-long fault during normal stress holding test. We find that the amplitude of coda transmission waves increases with the logarithm of stationary contact time. Localized increase amounted to a level ranging from 4% to 16% along the fault is observed during the 1-hour experiment. We discuss that the frictional strength at mesoscopic scale, which is related to the amplitude of coda transmission waves, is responsible for the phenomenon. Combining the reported method with other complementary approaches will enhance the understanding of fault mechanism either at laboratory or on-site applications.
关键词:  Coda transmission waves  Laboratory fault  Frictional contact area
DOI:10.19743/j.cnki.0891-4176.201903002
分类号:
基金项目:This project was sponsored by the National Natural Science Foundation of China (41874061).
Monitoring Contact State of Laboratory Fault with Coda Transmission Waves
XIE Fan, REN Yaqiong, HOU Jinxin
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
Abstract:
We monitored the amplitude changes of coda transmission waves around 500kHz across the frictional interface of a simulated 1.5-meter-long fault during normal stress holding test. We find that the amplitude of coda transmission waves increases with the logarithm of stationary contact time. Localized increase amounted to a level ranging from 4% to 16% along the fault is observed during the 1-hour experiment. We discuss that the frictional strength at mesoscopic scale, which is related to the amplitude of coda transmission waves, is responsible for the phenomenon. Combining the reported method with other complementary approaches will enhance the understanding of fault mechanism either at laboratory or on-site applications.
Key words:  Coda transmission waves  Laboratory fault  Frictional contact area