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本文比较了溧阳原地重复的两次中强地震烈度分布和衰减特征,并将震区划分为四种不同类型的地基土。对两次地震极震区与整个破坏区烈度线在轴向上不协调原因加以讨论,认为以淤泥质亚粘土为主的Ⅳ类地基土在震中区东部大面积分布是其主要原因。重新勾绘了极震区的烈度线,以排除场地条件对烈度分布的不均匀影响。经“归一法”处理,显示出烈度分布较严格地受发震断层控制,极震区的烈度形态与整个等烈度线形态趋于一致。
This paper compares the intensity distribution and attenuation characteristics of two moderately strong earthquakes repeated in-situ in Liyang, and divides the earthquake region into four different types of foundation soil. The reasons for the incompatibility of the seismic line between the two earthquakes and the entire destructive zone in the axial direction are discussed. It is considered that the main reason for the large area distribution of the Ⅳ type foundation soil, which is dominated by silt and clay, in the epicenter area. Redefine the intensity line of the extreme earthquake zone to exclude the uneven influence of site conditions on the intensity distribution. The “normalization method” shows that the distribution of intensity is more strictly controlled by the seismogenic fault, and the intensity patterns of the extreme earthquake areas tend to be consistent with those of the entire isotherms.