【摘要】 利用豫北地区1485年至今M≥4.7级地震和1970年以来ML≥3.0级地震资料,采用了地震活动韵律、6级地震的减震效应、P轴方向变化等方法,对豫北地区,特别是聊兰地震带近几年地震活动特点进行了分析,并剖析了其与1983年菏泽6.0级地震震前异常的差异。更多还原

【Abstract】 Based on the data of earthquakes with M≥4.7 from 1485 to now,and that ML≥3.0 since 1970,the paper analyzed the features of earthquake activities in Yubei region,especially in Liaolan seismic belt,by employing the methods of earthquake activity echo,decreasing effect of M6 earthquakes,and P-axis,and compared the earthquake activities in Yubei region with the event of Heze M6 earthquake in 1983更多还原