Resumen
This paper presents a preliminary analysis of thermal anomalies before the Baja California M7.2 earthquake occurred on April 4, 2010. The results show that surface air temperature of the Mexicali station, which is the closest one to the epicenter, reaches its maximum value on March 30, which is also the maximum value from January 1 to April 10, 2010. Weather stations far away from the epicenter (100 km away) show no other thermal anomaly. In particular, the National Centers for Environmental Prediction Final Operational Global Analysis (NCEP-FNL) air temperature data show a maximum temperature change between March 30 and 31 at the epicenter grid point, while the other surrounding 7199 grid points show medium to low temperature change. The microwave brightness temperature measured by the Advanced Microwave Scanning Radiometer on board the EOS Aqua satellite (AMSR-E) also shows an increase on March 31. The results of multiple thermal parameters analysis obey well the DTS criterions: deviation (D), time synchronism (T), and space consistency (S), so they can be considered as convincing seismic thermal anomalies. This analysis might contribute to make reliable earthquake predictions.