浙江省北部及邻区中强地震前地倾斜异常特征及其预测意义

Tilt precursor characteristics of the medium and great earthquakes in the northern Zhejiang and in the vicinity and the significance in the earthquake prediction

解释并讨论了湖州和宁波台１９９３年以来的地倾斜资料，总结了震前有异常显示的６次地震。发现：①异常在现场记录资料中均有显示，异常形态的识别对预报地震有重要的意义；②能观测到异常全过程的倾斜仪与震中的距离基本符合式ｌｇＤｊ＝０．３０３（ＭＳ＋１．６）给出的监测能力半径，大于这个半径的台有时也能观测到异常，但多为短临异常。如果震前记录到异常的全过程，则利用单台资料可能对地震三要素进行预测。

he tilt data obtained by Huzhou and Ningbo stations since 1993 are interpreted and discussed,and the anomalies of 6 earthquakes are summarized.It is found that,(1)the anomalies always appeared in the data,whose features are useful for predicting earthquake;(2)the distance at which the whole anomaly process can be recorded is almost in agreement with that determined by lgDj=0303(MS+16).The stations with the distances larger than that sometimes can record anomalies,but the anomalies are of the shortterm or immediate.It is possible to determine the 3 factors using singlestation data if the whole process of anomaly is recorded.