Experimental Study on Evolution of Thermal Field of En Echelon Fault during the Meta-Instability Stage
详细信息
- 责任者：Ren Yaqiong (State Key Laboratory of Earthquake Dynamics ; Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Liu Peixun
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(7)
- 关键词：雁列断层 ; en echelon faults ; 地震预测 ; earthquake prediction ; 地震前兆 ; precursor
- 页码：p.2348-2357
- 图表：8 illus., 38 refs.
- 分类号：0500
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
Detecting earthquake precursors is a difficult topic of earthquake prediction at home and abroard.Carrying out rock deformation experiments in the laboratory and observing the evolution of the characteristics and the laws of the related physical parameters is fundamental and important to the exploring of earthquake precursors.In this study,a sample of compressive en echelon fault set was used to perform the deformation experiment.An infrared thermal image system recorded the temperature variations of the rock samples during the deformation stage.The deformation stage of precursory significance is divided into a strongly-deviation-from-linearity stage,meta-instability stage and instability stage based on the stress-time curve.The purpose of this article is to study the spatial and temporal variations of the thermal field in each stage especially the meta-instability stage and summarize the possible precursory phenomena.The experimental results show that: The temperature in the jog area increases because of compressive stress state during the strong-deviation-from-linear stage;the region of temperature increase moved to the faults from the jog area and the high temperature points on the faults spread and connect due to the converting of fault dislocation from local to overall during the stage of meta-instability,and synergy of temperature increase on the faults and synergy of temperature decrease in between the faults(including the jog area) are two important signals before the instability;The temperature of the whole sample decreases because of stress release except for increasing on the faults caused by friction during the instability stage.In short,there are evident characteristics of thermal field in the stage of meta-instability,which is helpful to identify the meta-instability state;the temperature varies in different deformation stages and different tectonic positions,which means the stage of the deformation and the tectonic position of anomaly should be taken into consideration when we are trying to find thermal anomaly related to the tectonic activity.
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