近年来华北南部地区地震活动增强的力学背景分析

Analysis on Mechanical Background of Seismic Activity Abnormity in South Part of North China in Recent Years

依据青藏高原东北缘与秦岭大地构造格局相关联的地质构造背景,青藏高原物质东流和"稳定"块体的阻挡是华北南部地区构造活动的主要动力来源之一的基本认识,分析了青藏高原东北缘4次8级地震前华北南部地区地震活动的基本特征。8级地震震中区附近地震活动异常变化不明显,但华北南部地区地震异常活跃,其异常活跃过程与青藏高原东北缘强震的孕育与发生存在明显的相关性,具有一定的异地震情指示意义。

The geological tectonic structure of northeast margin of the Tibetan Plateau correlates with that of Qinling - Dabashan region. The out flow of material in Tibetan Plateau lithosphere and regional structures interaction is the major tectonic stress acting on plate of the south part of North China. Based on these understandings, the seismic activity in south part of north China before 4 large earthquakes（M≥8） occurred on northeast margin of the Tibetan Plateau is analyzed. Seismic activity abnormity close to large earthquake epicenters is not obvious, but seismic activity in south part of north china is distinct. The process of seismic activity abnormity in south part of north china is visibly correlative with the strong earthquake brewing and occurring in northeast part area of Tibetan Plateau edge, The seismic situation display in outside areas give us some new idea on estimation the strong earthquake situation in northeast part area of Tibetan Plateau edge.