Abstract: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 MS4.5 in Songyuan area since 2017.The results show that: Before the MS4.9 on July 23, 2017 and the MS5.7 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.
ZHANG Zhihong,JIAO Mingruo,ZHANG Li et al. Study on the Thermal Infrared Brightness Temperature Anomaly before the Earthquake in Songyuan, Jilin[J]. jgg, 2021, 41(6): 595-599.