摘要
研究了十堰及邻区区域构造背景和地球物理场分布特点 ,分析了区域性地震构造与有感地震和中强地震活动的关系。结果表明 :区内中强地震活动与北西西向、北北西向断裂及北东 北北东向断裂密切有关 ;5级左右地震活动发生在大型沉降区内次级凸起与凹陷的交接带、现代构造活动的盆地或地槽、莫霍面斜坡扭曲部位 ;6级以上地震发生在现代地壳隆起边缘的沉降区一侧或大型凸起与凹陷区的过渡部位。
The features of tectonic background and geophysical field distribution within and near Shiyan city are studied and the relationship between regional seismic tectonic and strongly felt earthquake,strong-moderate earthquake activity is analyzed. The obtained result shows that moderately strong seismic activity is closely related to the faults along NWW direction, NNW direction and NE to NNE direction.The earthquakes of about M5.0 are active in the secondary convex-concave conjoining zones of a big subsidence field, the basins of present-day tectonic activity, the contorted position of ramp slope of Moho discontinuity and the earthquakes of M>6.0 occur usually in subsidence field nearby a modern crustral uplift or in the transitional part of a huge convex-concave area.
出处
《大地测量与地球动力学》
CSCD
2003年第4期105-110,共6页
Journal of Geodesy and Geodynamics
基金
中国地震局地震科学联合基金 ( 3 960 11)资助
