By Richard H. Groshong

ISBN-10: 3540310541

ISBN-13: 9783540310549

ISBN-10: 354031055X

ISBN-13: 9783540310556

Geological constructions are 3 dimensional, but are usually represented by way of, and - terpreted from, outcrop maps and constitution contour maps, either one of that are curved two-dimensional surfaces. Maps plus serial sections, known as 2½-D, supply a better method of 3 dimensionality. desktop know-how now allows geological interpretations to be constructed from the start in an absolutely 3 dim- sional setting. totally 3D geological types enable much better interpre- tions and interpretations which are a lot more uncomplicated to proportion with different geologists and with most of the people. This booklet presents an outline of concepts for developing structural interpretations in 2-D, 2½-D and 3D environments; for interpolating - tween and extrapolating past the regulate issues; and for validating the ultimate int- pretation. The underlying philosophy is that buildings are 3-dimensional sturdy our bodies and that info from in the course of the constitution, no matter if in 2-D or three-D layout, may be built-in into an internally constant three-D interpretation. it truly is assumed that almost all clients of this ebook will do their paintings on a working laptop or computer. C- sequently, the publication offers quantitative structural tools and strategies which are designed to be used with spreadsheets, mapping software program, and 3-dimensional c- puter-graphics courses. The ebook is additionally meant to supply the history for figuring out what interpretive software program, for instance, a working laptop or computer contouring p- gram, does immediately. so much ideas are offered in either a conventional layout acceptable for paper, pencil, and a pocket calculator, and in quantitative structure to be used with spreadsheets and computer-graphics or computer-aided-design programs.

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**Example text**

7, abbreviated NE¼ sect. 7. Quarter sections may themselves be divided into quarters, as in the northwest quarter of the northeast quarter of sect. 7, abbreviated NW¼NE¼ sect. 3E. 2 · Location Fig. 2. The Township-Range grid system. The basic unit is a 24-mile block of 6-square-mile townships. Township T2N, R3E is divided into sections. (After Greenhood 1964) a quarter are given in feet measured from a point that is specified. The surveys were not always done perfectly and were sometimes forced into irregular shapes by the topography.

6 · Faults Fig. 32. Vertical cross section showing the relative fault displacement terminology with horizontal as the reference plane Fig. 33. Vertical cross section showing the relative fault displacement terminology with bedding as the reference plane separation fault. , originally horizontal bedding), a normal-separation fault extends a line parallel to bedding and a reverse-separation fault shortens the line. Using bedding as the frame of reference is not the same as using a horizontal plane, as illustrated by Fig.

The plane has a dip of 32SE (150), and a strike of 060. a NESW compass directions and strike and dip directions are marked on the overlay (square). b Overlay rotated to bring the strike to north and the dip to east. Trace of plane and pole to plane marked on overlay. c Overlay returned to its original position. The plunge and trend of the pole is 58, 330 then return the overlay to its original position to see the plane in its correct orientation (Fig. 14c). Find the pole to the plane by placing the overlay in the starting position for drawing bedding, that is, with the strike direction N-S.

### 3-D Structural Geology: A Practical Guide to Quantitative Surface and Subsurface Map Interpretation by Richard H. Groshong

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