| 断层失稳错动热场前兆模式：雁列断层的实验研究 |
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| 引用本文： | 马瑾,刘力强,刘培洵,马胜利.断层失稳错动热场前兆模式：雁列断层的实验研究[J].地球物理学报,2007,50(4):1141-1149. |
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| 作者姓名： | 马瑾 刘力强 刘培洵 马胜利 |
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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 |
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| 基金项目： | 国家自然科学基金项目(40572125)，国家自然科学基金重大研究计划(90202018)，科技部科研院所社会公益研究专项资金(2004DIB3J129)，中国地震局专项经费资助. |
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| 摘 要： | 在实验室使用红外热像仪和接触式测温仪同步观测记录了压性和张性雁列断层失稳错动前后的热场变化过程.从实验记录中发现，在断层失稳引起温度场和热红外辐射亮温温度场上升之前，在两断层段之间的岩桥区发生降温变化.断层带开始升温发生在失稳前2～3 s内，岩桥区的降温却发生在失稳前约20s，这两个超前时间长度相差近一个量级.此类热场先降后升变化过程在雁列构造变形中有一定的普遍性，可能作为雁列断层失稳错动的热场前兆模式.根据实验观测结果，详细描述了上述热场变化的时间过程及其空间分布特征，分析了产生此种失稳前兆模式的机制，显著异常出现的条件及有利观测部位，讨论了它在地震前兆探索等研究中的意义.
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| 关 键 词： | 雁列断层 粘滑 热红外亮温温度 温度场 热场前兆模式 |
| 文章编号： | 0001-5733（2007）04-1141-09 |
| 收稿时间： | 2006-9-15 |
| 修稿时间： | 2006-09-15 |
Thermal precursory pattern of fault unstable sliding:An experimental study of en echelon faults |
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| MA Jin,LIU Li-Qiang,LIU Pei-Xun,MA Sheng-Li.Thermal precursory pattern of fault unstable sliding:An experimental study of en echelon faults[J].Chinese Journal of Geophysics,2007,50(4):1141-1149. |
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| Authors: | MA Jin LIU Li-Qiang LIU Pei-Xun MA Sheng-Li |
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| Institution: | Laboratory of Earthquake Dynamics,Institute of Geology, China Earthquake Administration, Beijing 100029,China |
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| Abstract: | We have measured synchronously the variation of temperature and infrared radiation fields before and after stick slip events on compressive and extensional en echelon faults by using an infrared thermal image system and a contact type thermometric apparatus in the laboratory. From the record during the experiments we found that the temperature and thermal radiation values drop first in the inner flank of the jog before they begin to jump along the fault. The relative rising of temperature along fault occurs 2～3 seconds before a stick slip, while drop of temperature in jog area happens 20 seconds before, meaning about a magnitude more time ahead. This kind of pattern \!temperature drops first and rises afterwards" is ubiquitous to some extent for stick slip events during the deformation of en echelon faults. Therefore, it can be regarded as a heat precursor pattern of instability. The temporal process and the characteristics in spatial structure of thermal field are described based on the results of the experiment. The mechanism of precursory pattern is discussed. The generation condition of remarkable anomalies and favorable sites of observations for this precursory phenomenon are analyzed. Moreover, the significance in exploring of earthquake precursory and application of satellite infrared information is discussed. |
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| Keywords: | En echelon faults Stick-slip Infrared radiation brightness temperature Temperature field Thermal precursory pattern |
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