1966年云南东川6.5级地震的热异常时空结构分析

本文分析了１９６６年云南东川６．５级地震前后浅层地温异常的时空结构及降水异常的水平结构。分析表明，震前数月浅层地温稳定维持正异常，发震前一个月激剧增温，发震当月达最大，震后降低；震前震中区为负地温距平区，随发震时刻临近，负距平区迅速演变为正距平区，而且强度和面积都不断增大，至发震时达最大，震后不断减小；热异常是从深层传向地表的；震中区震前为旱区，震后为涝区。本文还讨论了震源处热信息传到地表的条件和可能机制，认为在水热活动异常的断裂带上，至少对于浅源地震，对流传热是一种较为可能的传热机制。

ANALYSIS ON SPATIAL AND TEMPORAL STRUCTURE OF THERMAL ANOMALY OF THE DONGCHUAN EARTHQUAKE Ms=6.5,YUNNAN,IN 1966

In this paper,the space-time structure of shallow-layer ground temperature anomaly and the hor-izontal structure of precipitation anomaly before,during and after the origin month of the Dongchuanearthquake in l966 are analysed. The analysis indicated that the positive anomaly of ground tempera-ture almost steadily lasted several months before the seism,and then arose remarkably and reached tothe maxium during the origin month,and it generally fell after the seism;the epicenter located in anegative temperature anomaly area before the seism,then when the seism coming the negative anoma-ly area evaluated promptly to a positive one and its strength and area continuously increased,and gotto the maximum during seismic month,they decreased after the earthquake;the thermal anomalytransfered from the deep layer to the surface;the epicentral area is dry and rainy,respectively,beforeand after the seism. Furthermore,the condition and the possible mechanism by which the thermal in-formation at focus transfered to the surface are also discussed. It shows that,at least for a shallowfocus earthquake,the convective heat transformation must is a possible way of heat transformation.