关键词: 地震活动图象, 构造分析, 江苏

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