Thermal infrared anomalies prior to the Shaya M6.1 and Tajikistan M7.2 earthquakes in 2023
Based on the relative power spectrum method,this work analyzed the spatiotemporal evolution of thermal infrared anomalies before the Shaya M6.1 earthquake in Xinjiang,China,on January 30,2023,and the Tajikistan M7.2 earthquake on February 23,2023.From September 9,2022,a large area of thermal infrared anomalies occurred in Xinjiang,lasting 44 days.The two earthquakes occurred 143 days and 167 days after the beginning of the anomalies,respectively.The Shaya earthquake occurred at the edge of the thermal infrared high-value area,and the Tajikistan earthquake was approximately 200 km from the nearest anomaly area.The high-value area of the relative power spectrum at the epicenter of the Shaya earthquake exhibits a single-peak curve,while that at the epicenter of the Tajikistan earthquake exhibits a double-peak curve and lasts longer.Based on the two earthquake cases,it is postulated that when a large area of thermal infrared relative power spectrum anomalies occurs in Xinjiang,an earthquake with a magnitude of 6.5 or higher may occur at the edge of the anomaly area or in adjacent areas within the following six months,and the most possible occurrence time is within three months.
earthquakethermal infrared brightnessrelative power spectrum
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