| 基于声发射实验结果讨论大震前地震活动平静现象的机制 |
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| 引用本文： | 马胜利,蒋海昆,扈小燕,巴晶.基于声发射实验结果讨论大震前地震活动平静现象的机制[J].地震地质,2004,26(3):426-435. |
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| 作者姓名： | 马胜利 蒋海昆 扈小燕 巴晶 |
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| 作者单位： | 中国地震局地质研究所,地震动力学国家重点实验室,北京,100029;山东省地震局,济南,250014 |
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| 基金项目： | 国家“十五”科技攻关项目 (2 0 0 1BA6 0 1B0 2和 2 0 0 4BA6 0 1B0 1 )资助 |
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| 摘 要： | 基于岩石变形声发射实验结果讨论了大震前地震活动平静现象的机制。在双轴压缩、等位移速率加载条件下 ,挤压型雁列断层、含宏观凹凸体断层、Ⅲ型剪切断层等非连续断层在临近滑动失稳前 ,声发射活动均出现了明显的相对平静现象 ,表现为声发射事件的发生率和应变能释放水平显著降低。与此阶段相对应 ,断层带 (特别是非连续部位上新形成的一小段断层 )发生了蠕滑和匀阻化作用 ,并使得标本的差应力开始下降。根据实验结果提出 ,大地震前断层的“蠕滑 -匀阻化”过程是造成地震活动平静现象的可能机制
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| 关 键 词： | 声发射 地震平静 新生断层 断层蠕滑 |
| 文章编号： | 0253-4967(2004)03-0426-10 |
| 修稿时间： | 2004年7月6日 |
A DISCUSSION ON MECHANISM FOR SEISMIC QUIESCENCE BEFORE LARGE EARTHQUAKES BASED ON EXPERIMENTAL RESULTS OF ACOUSTIC EMISSION |
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| MA Sheng li,JIANG Hai kun,HU Xiao yan,BA Jing,FK.A DISCUSSION ON MECHANISM FOR SEISMIC QUIESCENCE BEFORE LARGE EARTHQUAKES BASED ON EXPERIMENTAL RESULTS OF ACOUSTIC EMISSION[J].Seismology and Geology,2004,26(3):426-435. |
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| Authors: | MA Sheng li JIANG Hai kun HU Xiao yan BA Jing [FK |
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| Affiliation: | MA Sheng li 1) JIANG Hai kun 2) HU Xiao yan 1) BA Jing 1) [FK |
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| Abstract: | This paper discusses the mechanism for seismic quiescence before large earthquakes based on experimental results of acoustic emission during rock deformation. Under the condition of biaxial compression and constant loading point velocity, samples simulating discontinuous faults, including compressional en echelon faults, fault with macro asperity, and model Ⅲ shear fault, show relative quiescence of acoustic emission before slip instability, which is characterized by obvious decrease of occurrence rate a. |
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| Keywords: | acoustic emission seismic quiescence newborn fault creep sliding |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
