大华北地区强震发生的空间位置研究

以大华北地区 (2 9°～ 4 2°N ,10 9°～ 12 4°E) 1970年以来发生的 11次ML6 0以上地震为研究对象 ,从地震的空间分布入手 ,来研究强震的发生位置与活动断裂带的关系。结果表明 :(1)强震往往发生在地震带发生明显拐折或相互交汇的部位。 (2 )断裂带对于强震的位置有较好的控制作用。 (3)强震前 1～ 5年内主震所在地震带上b值普遍有高值的过程。

RESEARCH OF SPATIAL LOCATIONS OF STRONG EARTHQUAKES IN GENERAL NORTH CHINA

Taking 11 M L≥6.0 earthquakes as the research objects in general North China area (29～42°N, 109～124°E) since 1970, the spatial distribution of the earthquakes is studied to find out the relations of the strong earthquakes and the modern active fault zone. It is concluded that: (1) sometimes strong earthquakes occur at the inflection area or the cross place of seismic fracture zones; (2) fault zones well control the strong earthquake locations in some areas; (3) in one to five years before the strong earthquakes occurs, the b value of the seismic zone in which the main earthquake located is generally high.