摘要
聊考断裂带是鲁西断块隆起和华北地块拗陷的分界断裂,其东西两侧巨大的地质构造差异使得该区成为地震孕育的有利场所。历史上该断裂带上曾多次发生M5.0级以上地震。第四纪以来,其南段地震活动最强,中段次之,北段最弱。震中空间分布呈有序迁移状态。自1970年以来,聊考断裂带中小地震集中区发生变化。90年代中期之前,地震活动主要集中在菏泽老震区;1997年下半年开始,濮阳-鄄城附近地震活跃,至今出现两次地震增强过程。鉴于该区地震活动平静与活跃相间,地震能量交替积累与释放,预计接下来一段时间地震活动水平较低。
Liaokao fault zone is a boundary fault block between the liftup in West Shandong and the sunken in North China. Great geological differences on both sides bring about frequent seismic activities in this area.In the history, there are several earthquakes with magnitude larger than M5.0. Since the Quaternary Period, the most frequent seismic activities occurred in the southern part, less in the middle, and the least in the northern part. The epicenter distribution changes in order. In addition , seismic zone has changed since 1970. Before middle 1990s , seismic activities are mainly concentrated in Heze. Since the second half of 1997, seismic activities occurred mainly in Puyang-Juancheng area. The seismic reinforcement process has happened twice from now on.
出处
《防灾减灾学报》
2014年第1期29-32,共4页
Journal of Disaster Prevention And Reduction
关键词
聊考断裂带
地震活动特征
地震集中区
地震迁移
Liaokao fault zone
seismic activity characteristic
seismic zone
seismic migration
