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做出了３２°～４０°Ｎ，８９°～１０５°Ｅ范围内各经纬度结点１９８９年７月～１９９６年１２月长波辐射（ＯＬＲ）月距平值曲线．将各结点的曲线图按经纬度排列起来，构成ＯＬＲ时空序列剖面图．根据对这些剖面图的分析，研究了强震前ＯＬＲ的变化特征．结果表明，强震前１～４个月震中附近结点ＯＬＲ曲线变化出现异常，表现为反向变化或振荡型．有的地震前异常的空间展布呈条带状．
Long-wave radiation (OLR) monthly anomalies were obtained from July 1989 to December 1996 for each latitude and longitude node in the range of 32 ° -40 ° N and 89 ° -105 ° E. The nodes of the curve according to latitude and longitude arranged together to form the OLR space-time sequence profile. Based on the analysis of these profiles, the changing characteristics of OLR before strong earthquakes are studied. The results show that the OLR curves near the epicenter in 1 ~ 4 months before the strong earthquakes showed abnormal changes, showing reverse or oscillatory patterns. Some anomalies before the earthquake spatial distribution was banded.