【摘要】 采用随机能量场的概念,将地震活动能量场看作时间和空间的随机函数场,用自然正交函数展开的分析方法,研究江苏及邻区自1970年1月至2007年12月的中小地震(2.1≤ML≤4.5)能量场变化特征,以及主要典型能量场的时间"权重"系数的变化特征。结果显示:前7个典型场的展开精度为0.9244。研究区内不同构造块体的地震活动能量场强度存在明显差异,其中下扬子块体的苏中、苏南地区及南黄海海域的地震背景能量值高于其他地区;从典型场的分布来看,该区域对研究区能量场的影响也最为显著。前6个主要典型场的时间"权重"系数随时间的变化幅度与研究区大部分中强震之间在时间上存在很强的相关性。更多还原

【Abstract】 We used the random function theory.The seismic energy fields of the Jiangsu and its neighboring areas are taken as random function of space and time from 1970 to 2007.And the natural orthogonal function has been used to analyze the time "weight" coefficients and the isogram of first several typical fields.The results show that the cumulative valve of first seventh typical fields was 0.9244;the strength of seismic energy was distinguished in different geological regions,with the strongest area in the middle and southern of Jiangsu,and the south Yellow Sea.The distribution of typical fields shows a most significant role of the area in the study of energy fields in Jiangsu and its neighboring areas.There is a strong correlation between the variation features of first several typical field time "weight" coefficients and moderate-strong earthquakes in the region.更多还原