2021年四川泸县Ms6.0地震临震长波辐射变化检测  

Outgoing longwave radiation changes of the Ms6.0 Luxian earthquake based on tidal generating force

作　　者：孙学霞 崔静 姜文亮 马未宇[3] 康春丽[3] 李强 SUN Xuexia;CUI Jing;JIANG Wenliang;MA Weiyu;KANG Chunli;LI Qiang(National Institute of Natural Hazards,Ministry of Emergency Management of China,Beijing 100085,China;Key Laboratory of Emergency Satellite Engineering and Application,Ministry of Emergency Management,Beijing 100124,China;China Earthquake Networks Center,Beijing 100045,China)

机构地区：[1]应急管理部国家自然灾害防治研究院,北京100085 [2]应急卫星工程与应用应急管理部重点实验室,北京100124 [3]中国地震台网中心,北京100045

出　　处：《遥感学报》2024年第9期2265-2275,共11页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家自然科学基金(编号:41772219);应急管理部国家自然灾害防治研究院基本科研业务专项(编号:ZDJ2019-17);高分遥感地震监测与应急应用示范系统二期(编号:31-Y30F09-9001-20/22-02)。

摘　　要：2021年9月16日四川省泸县发生MS 6.0地震,利用FY-2H地面长波辐射数据产品(OLR)分析研究区8月27日至10月1日长波辐射异常分布及变化。结果显示,研究区内震中东北部最先出现异常,异常整体呈北西—南东分布;时空演化呈现出初始增温—异常加强—高峰—衰减—平静的特征,与岩石受力应变破裂所经历的微破裂—破裂—加速破裂—破裂过程演化特征吻合。结果表明,天体引潮力对此次地震具有诱发作用,长波辐射异常一定程度上表征了地震孕育过程中应力应变的辐射变化。之后,利用NOAA卫星长波辐射产品数据追踪验证异常时段(9月11日—17日),发现两者结果表现特征较为一致,进一步说明了FY-2H卫星长波辐射数据可较好地应用于地震异常监测。With the rapid development of society,the overlapping degree between the distribution of social economy and population and the impact range of earthquake disasters is gradually increasing,and the harmfulness of earthquake disasters is further highlighted.Strengthening the monitoring and prediction of earthquake disaster risk is an important means to reduce the risk of earthquake disasters.Infrared remote sensing has gradually become an important means of earthquake prediction and monitoring.On September 16,2021,a Ms6.0 earthquake occurred in Luxian,Sichuan Province.The FY-2H surface Outgoing Longwave Radiation(OLR) data product was used to analyze the anomalous distribution and changes of OLR in the study area from August 27 to October1.On the basis of the TFFA algorithm,our research extracted infrared radiation anomaly and made a retrospective attempt at short-term and imminent earthquake monitoring and prediction.We extracted the infrared radiation anomaly that is continuous and has remarkable change characteristics one week before the earthquake and identified the development and evolution of the impending earthquake infrared anomaly.Results showed a cross distribution between anomaly distribution and seismic structure,and the evolution process corresponds to the thermal infrared radiation law of rock fracture.In accordance with the extracted long-wave radiation anomaly,we speculate that only when the tectonic stress accumulates to the critical state of rock fracture and sliding can the tidal force trigger the earthquake,and the extracted anomaly is likely a manifestation of energy release in this process.With the change of tidal force,anomalies first appeared in the central and northeastern parts of the epicenter in the study area,and the anomalies were distributed in the northwest-southeast as a whole.This phenomenon and the evolution characteristics of rock stress-strain-fracture-experienced microfracture-fracture-accelerated fracture-fracture process are consistent.Results show that the tidal force of cele

关 键 词：遥感 FY-2H 短临异常 泸县地震 长波辐射 引潮力 

分 类 号：P315.73[天文地球—地震学] P2[天文地球—固体地球物理学]