Anomaly trend analysis of satellite thermal infrared and TEC before two strong earthquakes in Turkey on February 6, 2023

The two successive earthquakes of magnitude 7.8 in Turkey on February 6, 2023, were a remarkable tectonic movement and a particularly typical scientific experiment scene. At present, various observational data are abundant, providing a perfect opportunity for scholars around the world to verify their conjectures, models and conduct experiments. By using the thermal infrared annual mean line difference amplitude enhancement ratio method and the sliding annual moving average method of TEC (Total Electron Content) microscopic anomaly events, which are both created by the writer, we found that there were high intensity thermal infrared anomalies in the east and west sides of the epicenter area in late April to early May and in August 2022, respectively. About one month before the earthquake, the synchronous thermal infrared activity of the east and west sides of the epicenter and the northern region was significantly enhanced. In particular, the annual mean line difference amplitude enhancement ratio of the northern region hit the highest record since 2018 on January 31, 2023, and was 2.5 times the average level of the four years before the earthquake. The sliding annual moving average method of TEC microscopic anomaly events showed that the annual mean value of TEC microscopic anomaly events in the epicentre and its vicinity began to decline rapidly from 2021, and the annual mean value before the earthquake hit the lowest level in history, which was only about a quarter of the previous high since 2000. The two anomalies of thermal infrared and TEC are highly overlapping in time and space, and the earthquake occurred in the above two abnormal regions, indicating that the two anomalies may be closely related to this seismic series.