【摘要】 提出了前兆场稳定度的概念，利用前兆场稳定度的方法对中强地震前豫鲁冀交界区不同台站和不同手段的前兆观测数据进行分析。结果表明，在１９８３年１１月７日山东菏泽ＭＳ５．９级和１９８５年１１月３０日河北任县Ｍｓ５．０级地震前１４个月内，前兆场稳定度有低值异常显示，并且异常幅度越来越大，地震后恢复到正常值。更多还原

【Abstract】 Proposing and using the concept of precursor field stability, the precursory observational data before moderate earthquakes on the boundaries of Henan, Sandong and Hebei are analyzed. The results show that the precursor field Stability shows low abnormal values within 14 months before the Ms 5. 9 earthquake on Nov.7 1 1983 in Heze, Shandong and the Mss 5.0 earthquake on Nov. 30, 1985 in Renxian, Hebei, the anomaly magnitudes were more and more obvious and they return to normal after the earthquakes.更多还原