2023年2月6日土耳其两次强震前卫星热红外及TEC趋势异常分析  

Anomaly trend analysis of satellite thermal infrared and TEC before two strong earthquakes in Turkey on February 6,2023

作　　者：唐好丛 廖洪月 吴佳 王刚 Tang Haocong;Liao Hongyue;Wu Jia;Wang Gang(Xi’an Earthquake Monitoring and Early Warning Center,Shaanxi Xi’an 710199,China;Xi’an Earthquake Agency,Shaanxi Xi’an 710018,China)

机构地区：[1]西安市地震监测预警中心,陕西西安710199 [2]西安市地震局,陕西西安710018

出　　处：《地震科学进展》2023年第10期449-461,共13页Progress in Earthquake Sciences

基　　金：陕西省地震局启航与创新基金课题(QC-202308)资助。

摘　　要：2023年2月6日土耳其连续2次7.8级地震是一次显著的地质构造运动,也是一个特别典型的科学实验场景。当前各类观测数据较为丰富,为全球学者验证自己的猜想和进行模型实验提供了绝佳的机会。本文利用自行研究的热红外年均线差值振幅增强比法和TEC(Total Electron Content,电离层总电子含量)微观异常事件滑动年均线法研究发现,分别于2022年4月底至5月上旬、8月,在震中区域东西两侧曾出现高强度热红外异常;震前约1个月,震中东西两侧及北部区域同步热红外活跃性显著增强,尤其是北部区域其年线差值振幅增强比值在2023年1月31日创新高,是2018年以来最高记录,且为震前4年平均水平的2.5倍。TEC微观异常事件滑动年均线法研究显示,震中及附近区域TEC微观异常事件年线值从2021年开始快速下降,震前均值创历史最低水平,其年均值降至2000年以来高点的25%。热红外及TEC 2种异常在时间、空间上存在高度重叠,且地震发生在以上2种异常区域内,说明2种异常与本次地震系列可能存在密切联系。The two successive earthquakes of magnitude 7.8 in Turkey on February 6,2023,were a remarkable tectonic movement and a particularly typical scientific experiment scene.At present,various observational data are abundant,providing a perfect opportunity for scholars around the world to verify their conjectures,models and conduct experiments.By using the thermal infrared annual mean line difference amplitude enhancement ratio method and the sliding annual moving average method of TEC(Total Electron Content)microscopic anomaly events,which are both created by the writer,we found that there were high intensity thermal infrared anomalies in the east and west sides of the epicenter area in late April to early May and in August 2022,respectively.About one month before the earthquake,the synchronous thermal infrared activity of the east and west sides of the epicenter and the northern region was significantly enhanced.In particular,the annual mean line difference amplitude enhancement ratio of the northern region hit the highest record since 2018 on January 31,2023,and was 2.5 times the average level of the four years before the earthquake.The sliding annual moving average method of TEC microscopic anomaly events showed that the annual mean value of TEC microscopic anomaly events in the epicentre and its vicinity began to decline rapidly from 2021,and the annual mean value before the earthquake hit the lowest level in history,which was only about a quarter of the previous high since 2000.The two anomalies of thermal infrared and TEC are highly overlapping in time and space,and the earthquake occurred in the above two abnormal regions,indicating that the two anomalies may be closely related to this seismic series.

关 键 词：土耳其地震 热红外 振幅增强比法 TEC 微观异常事件 

分 类 号：P315.63[天文地球—地震学]