皮山6.5级地震前地表MODIS热红外异常与气象台站记录对比

Comparison between MODIS Thermal Infrared Anomaly before Pishan Ms. 6.5 Earthquake and Meteorological Records

利用2015年皮山6.5级地震前半年的MODIS影像,通过劈窗算法对震中周边地表温度进行反演,通过对比地表反演温度和震中周边气象台站气象记录,研究发现震中附近在震前80 d和15 d左右出现明显的热异常,但在震前1个月左右存在短暂的温度低异常现象。另外,根据近22年的气象记录,震中及周边在震前半年气温明显偏高,这种气象异常或可视为地震前兆。

The land surface temperature （LST） of epicenter is retrieved using the split window algorithm from the half year images a- round the Pishan where occurred an earthquake of magnitude 6.5 in 2015. Contrastive analysis has been explored between LST and the station meteorological records near the epicenter. It is reported that thermal anomalies appear about 80 and 15 days before the earth- quake, and appear abnormal low temperature around 1 month before the earthquake. In addition, according to the meteorological re- cord of nearly 22 years, h is found the temperature was significantly high in and around the epicenter before the earthquake half a year, this kind of weather anomaly may be treated as earthquake precursors.