You may need to install acrobat reader to obtain the pdf documents. Stereographic projection techniques for geologists and engineers second edition article pdf available in mathematical geology 374. More in detail, you can project in equal area, or you can choose to project in equeal projection. Stereographic projection the basics geological digressions. Structural geology is the study of the threedimensional distribution of rock units with respect to their deformational histories. Description, measurement and analysis of glacitectonically.
The primary goal of structural geology is to use measurements of presentday rock geometries to uncover information about the history of deformation in the rocks, and ultimately, to understand the stress field that resulted in the observed strain and geometries. Software for stereographic projection there are several pieces of software that youd like to check out for that purposes. Orthographic projections for solving trueapparent dips and. Structural geology uses micro and mesoscale structures found in the rocks to. Consider a meridional section of the sphere through the point p as in fig. Two types of stereographic projection are commonly used. Structural geology, tectonics and geodynamics form a coherent and interdependent.
Stereographic projection of crystal faces page 3 of 6 972010. However, when plotting directional data in structural geology, they do represent the north and south geographic directions. Structural geology is the study of the threedimensional distribution of rock units with respect to. Tolkien library text id 86002a62 online pdf ebook epub library ragan this combination of text and lab book presents an entirely different approach to structural geology designed for undergraduate laboratory classes it provides a step by. Stereographic projection is a powerful method, not just to solve relatively simple but important problems of dip and strike, but as an analytical tool for more complex structural geology. The point p can be inserted using the protractor and joined to s. Stereographic projection is a method for analyzing the nature and orientation of. To perform the projection we connect points on the lower half of our great circle to the topmost point of the sphere or the zenith red lines in fig. There are several good software programs and apps to automate projections for large data sets. A circleshaped projection part of a circle then occurs on our horizontal projection plane, and this projection is a stereographic projection of the plane.879 771 899 281 1433 1319 561 453 1114 1169 357 1108 1336 189 735 1407 1087 295 563 823 1493 1034 1184 1104 1146 1461 935 1083 1191 899 34 883 1285 49 656 577 796 589 1068 1444 1271