Monitoring Contact State of Laboratory Fault with Coda Transmission Waves  

作　　者：XIE Fan REN Yaqiong HOU Jinxin 

机构地区：[1]Institute of Geophysics,China Earthquake Administration

出　　处：《Earthquake Research in China》2019年第3期431-436,共6页中国地震研究（英文版）

基　　金：sponsored by the National Natural Science Foundation of China(41874061)

摘　　要：We monitored the amplitude changes of coda transmission waves around 500 kHz 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.We monitored the amplitude changes of coda transmission waves around 500 kHz 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 

分 类 号：P31[天文地球—固体地球物理学]