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Characteristics of the AE Distribution and Triggering Mechanism of a Simulated Meter-Scale Fault after Stick-Slip Events
HOU Jinxin1, XIE Fan1, REN Yaqiong1, WANG Baoshan1,2
1.Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration,Beijing 100081, China;2.School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
摘要:
With the more complete acoustic emission (AE) catalog improved by the multi-channel AE matched-filter technique (MFT), we study the spatiotemporal evolution of the AE activities after laboratory stick-slip events incorporate with the slip data recorded by displacement transducers on an ~1.5 m granite fault. The results show that the number of the AE events identified by MFT is about 9 times larger than that of the traditional method. A logarithmic expansion of early AE events along the fault strike is observed as a function of time, whereas the fault does not slip in the same manner. Thus, we related the expansion of the early AE events along the fault to the stress transfer caused by the adjacent AE events. Moreover, there is a good correlation between the cumulative number of the later AE events and the amount of fault slip. It suggests that the stress change caused by the continuous slip of the simulated fault after the stick-slip events response for the later AE events near or on the simulated fault.
关键词:  Stick-slip  Acoustic emission matched-filter technique  Spatiotemporal evolution  Fault slip
DOI:10.19743/j.cnki.0891-4176.202003005
分类号:
基金项目:This project is supported by National Key R&D Program of China (2016YFE0109300), National Natural Science Foundation of China (41874061 and 41802231).
Characteristics of the AE Distribution and Triggering Mechanism of a Simulated Meter-Scale Fault after Stick-Slip Events
HOU Jinxin1, XIE Fan1, REN Yaqiong1, WANG Baoshan1,2
1.Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration,Beijing 100081, China;2.School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
Abstract:
With the more complete acoustic emission (AE) catalog improved by the multi-channel AE matched-filter technique (MFT), we study the spatiotemporal evolution of the AE activities after laboratory stick-slip events incorporate with the slip data recorded by displacement transducers on an ~1.5 m granite fault. The results show that the number of the AE events identified by MFT is about 9 times larger than that of the traditional method. A logarithmic expansion of early AE events along the fault strike is observed as a function of time, whereas the fault does not slip in the same manner. Thus, we related the expansion of the early AE events along the fault to the stress transfer caused by the adjacent AE events. Moreover, there is a good correlation between the cumulative number of the later AE events and the amount of fault slip. It suggests that the stress change caused by the continuous slip of the simulated fault after the stick-slip events response for the later AE events near or on the simulated fault.
Key words:  Stick-slip  Acoustic emission matched-filter technique  Spatiotemporal evolution  Fault slip