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溧阳地震区北北东和北西西向两组活动性断裂构成的空间“X”型闭锁结构,为释放应变能创造了特殊的启动条件。闭锁菱面体端部分别造成高应力、高应变累积区,在总体超越屈服限前仍可近似地用弹性型式进行解析。1974年和1979年两次中强震分别偏于“入”字型发震断裂的下盘和上盘,余震沿派生的共轭剪破裂系发育。
The space “X” type latching structure consisting of two active faults in North and East and North West-West of Liyang earthquake area has created special start-up conditions for releasing strain energy. Closure of the rhomboidal end, respectively, caused by high stress, high strain accumulation area, before the overall yield limit can still be approximated by the elastic type of analysis. The two moderately strong earthquakes in 1974 and 1979 respectively deviated from the lower and upper plates of the “in” type seismogenic fault, and the aftershocks developed along the derived conjugate shear rupture system.