【摘要】 利用多种描述复杂现象的非线性方法处理了多台多项多年的前兆观测资料，通过“场”、“源”特征差异性的对比求得地震危险地点是一个能量“振荡”型积累的地区，具体表现为它是在前兆异常演化过程中出现的异常从属度最高、自相似性变化最大、前兆分维数下降最多的地区，而且还是在地震活动过程中出现的一个熵值相对较低的地区。研究结果还表明，震中位置的不确定性随着发震时刻的逼近而不断减弱更多还原

【Abstract】 Precursor data of many observatories and many items and many years are processed with non linear method which describes complex phenomena, and contrast and comparison are made between character of field and that of source The results show that earthquake risk area is the areas of energy “oscillating”type accumulation The concrete behaviour is that the earthquake risk area is the areas of maximum anomaly fuzzy subordinate degree,maximum variance of self similarity and the maximum drop of precursor fraction Moreover,the earthquake risk area is the low seismic entropy area The research results show that the uncertainity of epicenter position decreases with the approaching of earthquake更多还原