Abstract: A map of epicentre distribution contains a lot of tectonic information about the upper-middle crust.It is a menifestation of currently active tectonics on the surface of the Earth. According to the method of visual seismic line advanced by Prof.Ma Zongjin,a tectonic explanation of the image of earthquake epicinters with M_L≥2 during 1970～1992 years as well as with M_s≥4. 7 during 1500～1969 years in Jiangsu region is made in this paper. The main conclusions are as follows:(1)There mainly exist four groups of seismic line with different direction, that is NE,NW, NNE and EW in this region. The first two gropos of seismic line are rather obvious and form a grid-like structure at equal distance span. Most moderate and strong earthquakes that cocurred in this region are located in the intersections of the two groups of seismic line.(2) There are more dense and complex seismic lines in the depression of southern Yellow Sea. It seems that the depression of southern Yellow Sea is an independent tectonic unit of higher frequency and in tensity of earthquake activity.

Key words: Seismicity pattern, Structural analysis, Jiangsu

摘要： 据目视地震线法对江苏地区1970～1992年M_L≥2.0级地震震中所形成的地震点染图象进行了构造解释,对本区地震构造格局和动力学特征得到以下认识：(1)本区主要存在4组不同方向的地震密集带和地震线,其中北东、北西两组地震线比较明显,形成网格状构造,并大致具有等间距性,本区大多数中强地震发生在这两组地震线的交汇处；(2)苏中沿海至南黄海南部坳陷内地震线密集,方向复杂,地震活动频度较高,强度较大,形成一个突出于全区的、相对独立的构造单元。

关键词: 地震活动图象, 构造分析, 江苏