1947年青海达日7(3/4)级地震构造的遥感影像特征

THE SATELLITE IMAGERY CHARACTERISTICS OF REMOTE SENSING OF THE DARI SEISMOTECTIONIC(M=7(3/4)),QINGHAI PROVINCE IN 1947

通过对陆地卫星MSS磁带做不同计算处理表明:比值负变换—比值增强—彩色级上色所产生的图像对研究1947年青海达日7(3/4)级地震构造具有良好效果。不同时相陆地卫星影像均确定了该区北西西向线性构造的主导作用,同时计算结果明显地反映出达日县桑日麻盆地存在近东西向隐覆断裂;结合航磁资料分析,平顶山环形影象为一巨大隐伏岩浆岩体的反映,据此推断出达日地震构造及宏观震中位置,并得到实地考察的验证。

Through different calculating about the MSS tape of land satellite, the results show that the images are made by negative change of ratio—ratio increased—colouring of the colour level have a good effect to study on the Dari seismotectionic (Ms=7 3/4), Qinghai Province in 1947. The leading factor of the NWW direction of linear structure in this area is defined by different timephase; moreover, the calculations clear show that the Sangrima basin in Dari country has a subsurface fracture in the EW direction. Combining the data of aeromagnetic survey, the annular imagery of the Pingdingshan is a reflection of the giant subsurface magma rock mass. Accordingly, the seismotectionic and the macroscopic epiceatre of the Dari earthquake is infered and tested by on the spot investigation.