侯金欣^1,,
谢凡^1,,,
任雅琼¹,
王宝善^1,2
1. 中国地震局地球物理研究所(地震观测与地球物理成像重点实验室), 北京 100081
2. 中国科学技术大学 地球和空间科学学院, 合肥 230026

基金项目: 国家重点研发计划政府间科技创新合作重点专项（2016YFE0109300），自然科学基金（41874061，41561164018）及大地测量与地球动力学国家重点实验室开放基金（SKLGED2018-5-5-E）联合资助


详细信息

作者简介: 侯金欣, 男, 博士, 主要从事微震检测、地震活动性、声发射活动性等研究.E-mail:houjinxin1988@163.com

通讯作者: 谢凡, 男, 副研究员, 主要从事多重散射波传播机制及应用方面工作.E-mail:xiefan@cea-igp.ac.cn

中图分类号: P315

收稿日期:2019-03-14
修回日期:2019-07-29
上线日期:2020-04-05

Detection of acoustic emissions associated with the stick-slips of a meter-scale fault in laboratory by using the matched filter technique

HOU JinXin^1,,
XIE Fan^1,,,
REN YaQiong¹,
WANG BaoShan^1,2
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


More Information

Corresponding author: XIE Fan,E-mail:xiefan@cea-igp.ac.cn

MSC: P315

--> Received Date: 14 March 2019
Revised Date: 29 July 2019
Available Online: 05 April 2020


摘要
摘要:声发射观测是岩石摩擦实验中研究强震孕育机制的重要观测手段之一.传统的声发射观测以触发记录为主，难以捕捉并提取微弱的声发射信号.近年来天然地震学中发展的模板匹配技术可以在连续波形记录中识别出微弱的事件，大大提升事件检测能力.本文发展了适用于多通道连续记录的声发射信号的模板匹配技术，并将该技术应用于分析米尺度岩石断层黏滑失稳过程.研究结果显示：模板匹配技术识别出的声发射数量约为传统方法识别的5倍，相对完备震级降低约0.3.临近失稳，检测目录完备震级以上声发射率表现出幂律增加的特征，且声发射事件聚集在失稳破裂起始点附近.失稳后，检测目录完备震级以上声发射率表现出幂律衰减，其中失稳后早期表现出较慢的衰减速度.另外，失稳后早期声发射事件表现出随对数时间沿断层迁移的趋势.最后，通过与天然地震学观测的结果对比表明，声发射模板匹配识别技术是研究大尺度岩石摩擦滑动失稳过程中前震和余震时空演化规律的有效手段，该技术助于在方法上为室内实验和野外观测进行融合研究提供思路.
关键词: 米尺度岩石断层/
黏滑/
模板匹配/
声发射

Abstract:Monitoring acoustic emissions (AE) is important to study the earthquake mechanism in rock frictional experiments. Traditional AE observations are dominated by the triggered recordings, making it difficult to detect the weakly AE signals. In this paper, we present an AE monitoring method based on the matched filter technique (MFT). The method is used to analysis the 13-channel continuous AE recordings during the stick-slip experiment of a~1.5-meter simulated fault. The results showed that detected AE events were increased by~5 times and the relative magnitude of completeness was reduced by~0.3 compared to the AE events which were detected by traditional method. Furthermore, with the detected catalog, we observed the AE rate showed a power-law acceleration and the AE events clustered adjacent to the rupture initiation point of the stick-slip events before the instability. We also observed a power-law decay in AE rate, a slower decay of AE rate right after the instability, and spatially migration along the fault of the AE events with logarithmic time after the instability. By comparison of our results with natural seismological observations, we suggest that combining the method presented here with complementary approaches will enhance the understanding the evolution of the fault system either in the laboratory or for seismological applications.
Key words:Meter-scale fault/
Stick-slip/
Matched filter technique/
Acoustic emission



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