基于甘肃积石山6.2级和日本能登7.6级地震前热红外现象的均线差值增强比法的异常提取能力分析  

Anomaly extraction capability analysis based on the mean line difference enhancement ratio method for thermal infrared phenomena before the Jishishan M6.2 earthquake in Gansu Province and Noto M7.6 earthquake in Japan

作　　者：廖洪月 钟美娇 张永仙[3] 郭昱琴 郑怡[5] Liao Hongyue;Zhong Meijiao;Zhang Yongxian;Guo Yuqin;Zheng Yi(Xi’an Earthquake Agency,Shaanxi Xi’an 710018,China;Gansu Lanzhou Geophysics National Observation and Research Station,Gansu Lanzhou 730030,China;Institute of Earthquake Forecasting,CEA,Beijing 100036,China;Hainan Earthquake Agency,Hainan Haikou 570100,China;Shaanxi Earthquake Agency,Shaanxi Xi’an 710068,China)

机构地区：[1]西安市地震局,陕西西安710018 [2]甘肃兰州地球物理国家野外科学观测研究站,甘肃兰州730030 [3]中国地震局地震预测研究所,北京100036 [4]海南省地震局,海南海口570100 [5]陕西省地震局,陕西西安710068

出　　处：《地震科学进展》2024年第7期440-449,共10页Progress in Earthquake Sciences

摘　　要：2023年12月18日甘肃省积石山县发生6.2级、2024年1月1日日本能登发生7.6级地震,两次地震间隔时间较短,均造成较多的人员伤亡和巨大的财产损失,引起地震界的高度关注。运用均线差值振幅增强比法分析发现,这两次地震前均存在显著热红外异常:积石山地震前约110~90天,长波辐射热红外活跃性水平高于历史平均水平1.5~5倍;日本能登地震前约140~100天,热红外活跃性水平高于历史平均水平3~4倍。以上现象再次证明了强震前存在热红外异常现象,也从侧面说明了均线差值振幅增强比法具有较强的热红外异常提取能力。On December 18,2023,a M6.2 earthquake occurred in Jishishan County of Gansu Province,and on January 1,2024,a M7.6 earthquake occurred in Noto,Japan,with a short interval between the two earthquakes.They caused a large number of deaths and huge property losses with causing great concern in the seismic community.By using the mean line difference amplitude enhancement ratio method,it was found that there were significant thermal infrared anomalies before the two earthquakes.About 110 to 90 days before the Jishishan earthquake,the activity of long-wave radiant thermal infrared was 1.5 to 5 times higher than the historical average.Thermal infrared activity levels were 3 to 4 times higher than the historical average for about 140 to 100 days before the Noto earthquake in Japan.These results once again prove that there are thermal infrared anomalies before strong earthquakes,and also indicate that the mean line difference amplitude enhancement ratio method has strong ability to extract thermal infrared anomalies.

关 键 词：甘肃积石山地震 日本能登地震 均线差值振幅增强比法 热红外 

分 类 号：P315.63[天文地球—地震学]