SOME STATISTICAL RESEARCH ON THE LINEAR FRACTURES FROM LANDSAT PHOTO PICTURES IN NORTH CHINA

In this paper,the author used 123 Photoes from LANDSAT-1,2,3,which covered 1.36 million km² of the North China Region and then interpreted 4737,linear fractures of several kinds.we discovered that a lot of interse cted points of the linear fractures,the length of the linear fractures,and the number of the trending of the intersected groups are quite different in North China.The seismicities,geotherm,Cenozoic magma activities,and the deep source rocks are strongly related to the three characteristics of the linear fractures as mentioned above.The author applied a simple and convenient method to the statistics,mapping and preliminary analysis.A semi-quantitative quota had been worked out,that is,the density gradient of the crustal line ar fractures,which can interpret the relationship between the geological pb enomena as described above.The author believes that the new fractures occu rring recently in some regions of the North China platform result from the phenomena.