应用相对功率谱估计方法对华北地区中强地震前静止气象卫星热红外遥感亮温资料进行时频分析,结果表明:华北5级以上地震发生前存在显著的亮温热异常,震前1个月左右异常开始出现,高值幅值持续时间超过20天,功率谱幅值最高可以达到平均值的7倍以上,且发震区域一般位于异常区边缘或异常区域内的断层上.%Using relative power spectral method,we carried out time-frequency analysis of thermal infrared brightness temperature data from geostationary meteorological satellite before moderate to strong earthquakes in North China.The results show that there have dramatic brightness warm temperature changes before M＞5 earthquakes in North China.The temperature changes appeared about one month before the earthquake with high values lasting for more than 20 days.The characteristic spectrum amplitude can reach up to more 7 times than the average in the abnormal area,and the earthquake always appeared on the edge of the abnormal area or in the fault zone within the area.
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