摘要
在地震地质、航磁反演及人工地震测深工作的基础上,阐明了华北地区8级大震的3个深部构造特征,即地震发生在深部超壳断裂的上部,地震发生在强度较大的构造块体的边缘,震源区深部存在低速、低密及高导层构造,同时对地震成因进行了探讨,讨论了构造运动和壳内爆炸两种地震成因的可能。
Based on the results from seismo-geological study, aeromagnetic inversion and deep seismic sounding (DSS), it is found that the M=8. 0 earthquakes in North China have three common deep structural characteristics, i. e. , they all took place above the ultra-crustal deep faults or on the edges of the tectonic blocks with higher intensity, and there are low-velocity, low-density and high-conductive layers deep in the epicentral re gions. The origins of the earthquakes are also discussed and two possibilities of seismogen-esis are proposed, i. e. , tectonic movement and intracrustal explosion.
出处
《地震学报》
CSCD
北大核心
2003年第2期136-142,共7页
Acta Seismologica Sinica
基金
国家自然科学基金(4977230)资助课题
中国地震局地球物理勘探中心科技成果(编号 GPB200401).
关键词
华北地区
地震
深部构造
地震成因
North China
M=8. 0 earthquakes
deep structure
seismogenesis
