【摘要】 分析了中美洲及北京地区不同时段、不同尺度区域的地震活动特征 ,试图揭示地震空间活动的层次特征 .结果表明 ,不管所研究区域的范围和总体地震活动水平如何 ,总可以把它分为几个地震活动水平分别为高、中、低的小区域 ;在把一个区域粗略划分成 4个小区域的情况下 ,地震活动性最高与最低小区域的地震数目比值约为 4～ 5 ;对于更小的区域 ,地震活动也都具有这种规律 ,表现出很好的层次性 ,并且这种层次性不依赖于时间和震级 .地质构造的空间层次性是产生地震空间分布层次性的可能原因更多还原

【Abstract】 Seismicity feature of different scaled rectangles of Central America and Beijing region is analyzed to study the hierarchical characteristic of spatial distribution of earthquakes.The result shows that the spatial distribution is hierarchical and scale invariant.When the studied area is roughly divided into four small regions,the ratio between the number of earthquakes of the small region of which seismicity is high and the number of small region of which seismicity is low is 4～5.The earthquake distribution of smaller regions divided further possesses the same regularity.And this hierarchy is independent on time and magnitude.The hierarchy of crustal structure is the possible reason for the hierarchy of the earthquake spatial distribution.更多还原