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本文从地表地震断层、全新世断裂活动及区域构造讨论了华北平原近300年6次强震的构造特征.研究结果表明,这6次强震均有相应的地表地震断层出现,并与它们各自极震区等震线长轴方向一致.北西向地表地震断层为左旋走滑,北东向地表地震断层为右旋走滑.这些地区存在全新世活动断裂及古地震现象表明这些强震不是当地的首次强震破裂,华北平原强震存在原地重复现象.区域地震构造分析结果表明,强震地点与华北平原内第三纪断陷盆地的关系并不明显,而全新世活动断裂与华北平原周边构造的交叉部位则是近代强震活跃地区,也是值得注意的未来强震危险地点.
This paper discusses the tectonic features of six strong earthquakes over the nearly 300 years in the North China Plain from surface earthquakes, Holocene faulting and regional tectonics. The results show that all of the six strong earthquakes have associated surface seismic faults and are associated with their respective The direction of the major axis of the isochronal seismic line is consistent.The northwest surface seismic fault is left-lateral strike-slip, and the north-east surface seismic fault is dextral strike-slip.The existence of Holocene active faults and paleoearthquakes in these areas indicates that these strong earthquakes are not local The first strong earthquakes ruptured and the strong earthquakes in the North China Plain existed in situ repeat.The regional seismic tectonic analysis indicated that the relationship between the strong earthquakes and the Tertiary rift basins in the North China Plain was not significant and the relationship between the Holocene active faults and the North China Plain The intersections of the surrounding structures are the active areas where modern strong earthquakes are active and are also the places worthy of attention in the future.