强震活动迁移性图象的研究──以华北地震区为例  

STUDY ON MIGRATION OF LARGE EARTHQUAKES ── Taking the Earthquakes in North China as an Example

作　　者：叶文华[1] 邓起东[1] 尤惠川 

机构地区：[1]国家地震局地质研究所

出　　处：《华北地震科学》1994年第1期1-8,共8页North China Earthquake Sciences

摘　　要：以华北地震区７级以上强震活动的震中迁移图象为例，揭示了我国各地震区带内的强震震中迁移有以下基本迁移特性：强震震中在每完成一次迁移后均将改变其原来迁移运动的方向和速率，即改变其迁移运动的速度。因此，不论是时间意义上还是地点意义上，在强震震中迁移的前方将存在着一个未来强震危险性较小的前向扇形时空安全区，未来一次强震发生在这个扇形时空安全区内的可能性不大。并对强震震中这种普遍的变速度“扭头”或“掉头”迁移的现象作了初步解释。Taking the epicentre migration of large earthquakes of magnitude≥7. 0 in North China as an example, it is revealed in this paper that epicentre migration of large earthquakes in main seismic zones of China is characterized as follows: After one epicentre migration, the orientation and rate of the next epicentre migration will be changed. Therefore, in the significances of time and/or space, a sector region with smaller risk of large earthquakes would exist in front of epicentre migration, and the possibility for next large earthquake occurring in this sector region will be small. We have primarily explained the phenomena of variable 'turning round' of epicentre migration of large earthquakes.

关 键 词：地震 强震 震中迁移 图像分析 

分 类 号：P315.63[天文地球—地震学]