Pronounced Changes in Thermal Signals Associated with the Madoi (China) M 7.3 Earthquake from Passive Microwave and Infrared Satellite Data

Thermal variations in surface and atmosphere observed from multiple satellites prior to strong earthquakes have been widely reported ever since seismic thermal anomalies were discovered three decades ago. These changes are related stress accumulation caused by the tectonic activities final stage of earthquake preparation. In present paper, we focused on associated with 2021 Madoi M 7.3 China analyzed temporal spatial evolution Index Microwave Radiation Anomaly (IMRA) Longwave (ILRA) based 8-year microwave brightness temperature (MWBT) 14-year outgoing longwave radiation (OLR) data collected satellites. We also explored their responses different units (seismogenic fault zone active block). Our results indicated that enhanced IMRA was distributed along seismogenic mid-February reappeared for a longer time stronger intensity March April 2021. The pronounced enhancement ILRA within one month over Bayan Har adjacent blocks. higher blocks southern Tibet Plateau at beginning could be regional accumulation, as proven occurrences two moderate during this period.