赤平投影方法在大地构造研究中的改进及应用

Improvement and application of stereographic projection in tectonic

针对面状构造任意两点的产状都存在一定的差异,即一点的产状不能代表整个面状构造任意一点的产状,对传统的赤平投影方法进行了改进。采用改进的赤平投影方法,依据面状构造一点实测的产状研究面状构造的走向变化规律,并对发育于地球上的面状构造进行赤平投影解析。研究发现:改进的赤平投影方法能够确定面状构造的走向变化,其走向变化率与面状构造的倾角有关:倾角越小,走向变化率越高;因此,可根据实测规模较大的面状构造的走向,客观地进行构造应力场演化的研究。

Because any two points of occurrence of surface structure have some differences, that is, the occurrence of one point can not be on behalf of occurrence of any point of the entire structure, the traditional stereographic projection is improved in this article. Using the improved stereographic projection, the changing rule of surface structure is studied according to measured occurrence of one point in surface structure, and the surface structure grown in the earth is analyzed by improved stereographic projection, it can be found that the trend change of surface structure can be definite according to the improved stereographic projection, its changing rate of trend was related with inclination of surface structure and the inclination is smaller, the higer the changing rate of moving; so, the tectonic stress field evolution can be studied objectively according to the trends of the measured lager scale surface structure.