吉林松原地区地震前热红外亮温异常研究

Study on the Thermal Infrared Brightness Temperature Anomaly before the Earthquake in Songyuan,Jilin

使用小波变换和功率谱估计法,利用中国静止气象卫星亮温数据研究2017年以来松原地区3次M_(S)>4.5地震前的热红外异常。结果表明,2017-07-23 M_(S)4.9和2018-05-28 M_(S)5.7地震前的异常都是沿依兰-伊通断裂和密山-敦化断裂走向逐渐扩展的,即异常存在于松辽盆地的东部边缘,地震震中不在异常区内;2019-05-18 M_(S)5.1地震前异常不明显,可能是由于盆地内二氧化碳和甲烷等温室气体在前2次地震前后已得到最大量的释放。

We use wavelet transform and power spectrum estimation methods,along with the brightness temperature data of the Chinese stationary meteorological satellite.Then we research the thermal infrared anomalies before the three earthquakes more than M_(S)4.5 in Songyuan area since 2017.The results show that:Before the M_(S)4.9 on July 23,2017 and the M_(S) 5.7 on May 28,2018 earthquakes,the anomalies gradually expanded along the Yilan-Yitong fault and the Mishan-Dunhua fault zone.Anomalies exist in the eastern edge of the anomaly area and the epicenter is not in the abnormal area.The anomalies are not obvious before and after the earthquake;it could be that the greenhouse gases of the basin,such as CO2 and CH4,have large releases before the two earthquakes.