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1974年和1979年分别在江苏省溧阳县西部的上沛和上沛以东3公里的东张村,相继发生5.5级和6级中强地震。两次地震的宏观烈度分布相当复杂,并且有若干相似的特征。对烈度及其异常的研究,可从地震波传播途径、地震波的折射及反射、介质条件、震源机制等多种途径进行,这无疑是有益的。本文仅就场地条件(地形、地基土、地下水埋深条件)方面进行分析,认为在不考虑地震本身因素的条件下,在震区有些地段,场地条件是造成两次地震烈度分布复杂化的主要原因。溧阳震区房屋类型大体相似,以木骨架承重、空斗墙承重、土坯墙承重房屋为主,根
In 1974 and 1979, respectively, in Shangli, western Liyang County, Jiangsu Province, and Dongzhang Village, 3 kilometers east of Shangpei, 5.5 and 6 moderate earthquakes occurred successively. The macroscopic intensity distribution of the two earthquakes is quite complex and has several similar features. The research on the intensity and its anomaly can undoubtedly be useful in many ways, such as the transmission of seismic waves, refraction and reflection of seismic waves, medium conditions and focal mechanism. Based on the analysis of the site conditions (terrain, foundation soil and groundwater depth), this paper considers that the site condition is the main cause of the complexity of the two seismic intensity distributions in some areas of the earthquake zone without considering the factors of the earthquake itself the reason. Housing types generally similar to the earthquake in Liyang, wood skeleton load-bearing, empty wall load-bearing, adobe walls dominated by housing, root