2013年岷县—漳县M_S6.6地震前水氡浓度的临界慢化现象研究  

Critical Slow Down Phenomena of Radon Concentrations before the 2013 Minxian-Zhangxian M_S6.6 Earthquake

作　　者：王熠熙[1] 李赫[1] 王博[2] 杨朋涛[3] 王俊[4] 向阳[5] 王喜龙[6] 李悦[1] 

机构地区：[1]天津市地震局,天津300201 [2]中国地震台网中心,北京100045 [3]中国地震局地壳应力研究所,北京100085 [4]安徽省地震局,安徽合肥230031 [5]新疆维吾尔自治区地震局,新疆乌鲁木齐830011 [6]辽宁省地震局,辽宁沈阳110034

出　　处：《地震》2018年第1期128-138,共11页Earthquake

基　　金：地震科技星火计划(XH16006Y);地震科技星火计划(XH15042);国家自然科学基金(41502239);中国地震局震情跟踪青年任务(2017010304);中国地震局震情跟踪青年任务(2016010313)

摘　　要：基于临界慢化理论,以2013年7月22日甘肃岷县—漳县M_S6.6地震前南北构造带及邻区水氡浓度观测资料为例,逐一计算了表征临界慢化现象的自相关系数和方差。研究结果表明,2013年岷县—漳县M_S6.6地震前,10个台点水氡浓度资料表现出较明显的临界慢化现象,且出现慢化现象的观测点空间分布具有一定丛集性,慢化持续时间呈现出由南向北迁移的特征。综合分析认为,临界慢化方法可以有效识别水氡资料蕴含的慢化信息,这些早期异常信号对判定前兆异常所处阶段以及深入理解前兆资料变化的物理内涵具有重要的科学意义。Based on the principle of critical slowing down, we calculated correlation coefficient and variance, respectively, which characterize critical slowing down phenomena. In this case, we took the data of water radon concentration in the North-South Tectonic Zone and nearby areas before the July 22, 2013 Minxian-Zhangxian Ms6.6 earthquake as an example to illustrate the phenomena. The results indicate that the water radon concentration at 10 stations had obvious critical slowing down phenomena before the earthquake, and the spatial distribution of observation points with slowing down phenomena has certain clustering. And the slowing down duration is characterized by a shift from the south to the north. It can summarized that the testing method can identify the slowing down informa tion of water radon data effectively, and it is of great significance to determine the stage of precursory anomaly and to improve the understanding observation data changes before earthquakes.

关 键 词：水氡浓度 临界慢化 地震前兆 2013年岷县-漳县Ms6 6地震 

分 类 号：P315.7[天文地球—地震学]