2018年2月台湾花莲震群热红外遥感亮温异常分析

Anomalies of Thermal Infrared Brightness Temperature Before the Hualien,Taiwan Earthquake Swarm on February 2018

应用中国静止气象卫星FY-2G的TBB产品为基础数据,针对2018年2月上旬台湾花莲附近海域震群前出现在震中及附近区域的显著热红外异常,运用小波变换和相对功率谱法进行异常提取和资料分析。结果表明:花莲震群热红外异常范围主要分布在震中SW区域,震前约8个月出现功率谱增强现象,随时间推移,异常范围延纵谷断裂带逐渐扩大,持续近2个月,最大异常幅度超过14。

To resolve the obvious thermal infrared anomalies before the Hualien,Taiwan earthquake swarm on early February 2018,the TBB data of the national geostationary meteorological satellite FY-2G were collated in this study,and the anomalies were analyzed and extracted using the wavelet transform and relative power spectrum.Results showed that the thermal infrared anomaly range of the Hualien,Taiwan earthquake swarm was mainly distributed in the southwestern part of the epicenter area,and the phenomenon of power spectrum enhancement occurred approximately 8 months before the earthquake.With time,the abnormal range extended,and the longitudinal valley fault zone expanded gradually within approximately 2 months,with the largest amplitude exceeding 14.