Analysis of Thermal Infrared Anomalous Increase of MODIS
Satellite before the Pingguo Ms4.5 Earthquake
1 Earthquake Bureau of the Guangxi Zhuang Autonomous Region, 33 Gucheng Road, Nanning 530022, China
2 Institute of Geophysics, CEA, 5 South-Minzudaxue Road, Beijing 100081, China
Abstract：We collected the continuous thermal infrared data of MODIS/Terra satellite remote sensing in the Pingguo 4.5 magnitude earthquake zone from December 2012 to March 2013. We processed it through the clouds, selected the thermal infrared data between 5:00-7:00 a.m. in Beijing time (the best period for observation to conduct land surface temperature data retrieval), analyzed the time evolution process of land surface temperature anomalies before and after the earthquake, as well as the relationship between abnormal spatial distribution and active fault. Further, we discuss the impact of non-structural factors such as earthquake zone topography, landform, and seasonal weather on land surface temperature anomalies. The results show that: 1) There was a phenomenon of thermal infrared abnormal warming near the epicenter two months before the earthquake in Pingguo, and there was a correspondence between the abnormal warming and earthquake occurrence time. Significant warming occurred in the first half of the month, while 7 days before the earthquake the abnormal warming reached its peak, and dropped rapidly after the earthquake. 2) Through the relative analysis of non-structural factors such as earthquake zone topography and landforms, seasonal weather, the structural “warming” information, which was anti-seasonal and due to the abnormal warming of the earthquake zone. 3) Abnormal warming developed from the epicenter along the faults in the NW direction, and it was relatively consistent with the seismogenic tectonic of NW direction. After full consideration of the influence of non-structural factors such as earthquake zone topography, landforms and seasonal weather on the abnormal warming, it is inferred that this thermal infrared warming could be a short imminent anomaly phenomenon before the earthquake.
WEN Xiang,ZHOU Bin,YAN Chunheng et al. Analysis of Thermal Infrared Anomalous Increase of MODIS
Satellite before the Pingguo Ms4.5 Earthquake[J]. jgg, 2015, 35(6): 1078-1083.
