Deep structural characteristics and seismogenesis of the M≥8.0 earthquakes in North China  

作　　者：张先 张先康 刘敏 赵丽 

机构地区：[1]ResearchCenterofExplorationGeophysics,ChinaSeismologicalBureau

出　　处：《Acta Seismologica Sinica(English Edition)》2003年第2期148-155,共8页

基　　金：State Natural Science Foundation of China (4977230).

摘　　要：Based on the results from seismogeological study, aeromagnetic inversion and deep seismic sounding (DSS), it is found that the M8.0 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 regions. The origins of the earth-quakes are also discussed and the two possibilities of seismogenesis are proposed, i.e., tectonic movement and intracrustal explosion.Based on the results from seismogeological study, aeromagnetic inversion and deep seismic sounding (DSS), it is found that the M8.0 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 regions. The origins of the earth-quakes are also discussed and the two possibilities of seismogenesis are proposed, i.e., tectonic movement and intracrustal explosion.

关 键 词：North China M8.0 earthquakes deep structure SEISMOGENESIS 

分 类 号：P315.63[天文地球—地震学]