江苏地区地震活动性图象的构造解释
|
摘要
据目视地震线法对江苏地区１９７０～１９９２年ＭＬ≥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。
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 ML≥2 during 1970～1992 years as well as with Ms≥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.
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 ML≥2 during 1970～1992 years as well as with Ms≥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.
引文
程德利，王．姜长宁，等．1994华东地区地震活动性、应力场特征与板块作见见：陈运泰，阚荣举，滕吉文，等主编．中国固体地球物理学进展北京：海洋出版社314～329．丁国瑜，李永善．1979，我国地震活动与地壳现代破裂网络．地质学报（1）：22～34．高中和．1989．下扬子地区地震构造研究现状与展望．地震学刊（3）：1～6．李起彤，南金生，苏顺昌，等．1990．华东地区中强地震构造背景和地质标志研究．华南地震，10（1）：1～13．马宗晋1987中国大陆的地震层和地震线地壳构造与地壳应力文集（1）．北京：地震出版社1～7．马宗晋．1992中国地震震中分布图的构造解释．中国地震．8（1）：10～17．马宗晋，郑大林1981中蒙大陆中轴构造带及其地震活动．地震研究，4（4）：421～436．谢瑞征1987．苏南核电厂工作区内活动断层与地震关系的研究．见：张雪亮主编．苏南核电厂场地地震危险性分析文集．北京：地震出版社．1～8．谢毓寿，程德利，丁学仁．19891900～1980年中国M≥4．7级地震的均一震级目录．北京：地震出版社．中国地震简目汇编组1988．中国地震简目．北京二地震出版社
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心