| 利用超声尾波观测1.5 m长岩石断层黏滑实验的波速变化 |
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| 引用本文： | 谢凡,任雅琼,王宝善.利用超声尾波观测1.5 m长岩石断层黏滑实验的波速变化[J].地球物理学报,2017,60(4):1470-1478. |
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| 作者姓名： | 谢凡 任雅琼 王宝善 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金青年基金（41504044），云南省陈颙院士工作站（2014IC007）专项经费，中央公益性科研院所基本科研业务费（DQJB15B01，DQJB15B07）联合资助. |
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| 摘 要： | 在实验室内利用超声尾波观测大尺度(1.5 m)岩石断层的黏滑过程.利用基于尾波干涉的观测方法,我们获得了高达10~(-6)的相对波速变化的观测精度,这相当于~10 kPa的应力变化.利用高精度的测量,我们获取两种不同加载速率下(1μm·s~(-1),10μm·s~(-1))黏滑过程三个阶段(恢复、加载和滑动)基于波速变化的特征量.我们更进一步获取了断层失稳阶段波速变化的时空演化过程.最后讨论了该观测方法需要改进的地方.以上研究结果表明作为一种对现有实验观测手段的有益补充,利用超声尾波观测实验室大尺度岩石断层的动力学过程是可行的.
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| 关 键 词： | 超声 尾波 黏滑 大样品 波速变化 |
| 收稿时间： | 2016-10-09 |
Observation of stick-slips on a 1.5 m-long granite fault using ultrasonic coda waves |
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| XIE Fan,REN Ya-Qiong,WANG Bao-Shan.Observation of stick-slips on a 1.5 m-long granite fault using ultrasonic coda waves[J].Chinese Journal of Geophysics,2017,60(4):1470-1478. |
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| Authors: | XIE Fan REN Ya-Qiong WANG Bao-Shan |
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| Institution: | Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | This paper describes the use of an ultrasonic coda waves for observation the stick-slips on a large-scale 1.5-meter granite fault. By using coda wave interferometry, a resolution of 10-6 in relative velocity change is obtained which corresponds to a sensitivity stress change of ~10 kPa. Due to such high sensitivity, we characterize the 3 phases (recovery, loading and slipping) of stick-slip by means of time-dependent velocity change at two different loading rate (1 μm·s-1,10 μm·s-1). Furthermore, we analysis the spatial-temporal changes along the fault during the slip-instability stage. The performance of the method is discussed. The study demonstrated that as a complementary method, the ultrasonic coda waves is a practical tool to study the geodynamics of large-scale laboratory fault. |
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| Keywords: | Ultrasound Coda waves Stick-slips Large-scale Velocity change |
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