The comparison of anomalies of the satellite thermal infrared observation data between the 2008 M8.0 Wenchuan and the 2013 M7.0 Lushan earthquakes

The 2008 M8.0 Wenchuan and the 2013 M7.0 Lushan earthquakes occurred on the Longmenshan fault respectively within 5 years interval.In this paper we use the departure method to analyze the observation data.We found that anomalies in the observation data of satellite thermal infrared appeared before these two earthquakes.In order to find out the similarities and differences between anomalies before two earthquakes,we compare two group data and find that the medium- and long-term anomalies appeared before two earthquakes.There are short-term anomalies before the Lushan earthquake,but there were not clearly short-term anomalies before the 2008 M8.0Wenchuan Earthquake.Even though a half year before the 2008 M8.0 Wenchuan Earthquake occurred,there were not any anomalies.The total area of the abnormal warming region is up to hundreds of thousands of square kilometers.The main anomalies did not distribute around the epicenter areas or the seismogenic faults of these two earthquakes.