Download PDF by Richard H. Groshong: 3-D Structural Geology: A Practical Guide to Surface and

By Richard H. Groshong

ISBN-10: 3540654224

ISBN-13: 9783540654223

It is a instruction manual of sensible strategies for making the very best interpretation of geological constructions on the map scale and for extracting the utmost quantity of data from floor and subsurface maps. The 3D constitution is outlined by means of internally constant constitution contour maps and go sections of all horizons and faults. The ebook is directed towards the pro person who's fascinated with either the accuracy of an interpretation and the rate with which it may be bought from incomplete facts. Quantitative tools are emphasised all through, and diverse analytical strategies are on condition that might be simply carried out with a pocket calculator or a spreadsheet. Interpretation recommendations are outlined for GIS or CAD clients, but are basic adequate to be performed through hand. The consumer of this e-book could be in a position to produce higher geological maps and pass sections, pass judgement on the standard of latest maps, and find and connect mapping error.

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Extra info for 3-D Structural Geology: A Practical Guide to Surface and Subsurface Map Interpretation

Example text

2 Natural Variation of Dip and Measurement Error The effect of measurement error or of the natural irregularity of the measured surface on the determination of the attitude of a plane is readily visualized on a stereogram. The plane is represented by its pole (Fig. 16). Irregularities of the measured surface and measurement errors should produce a circular distribution of error around this pole (Cruden and Charlesworth 1976). 3 · Orientations of Lines and Planes Fig. 16. Equal-area, lower-hemisphere stereogram.

14b) or, equivalently, count the dip amount up (outward) from the center point of the diagram. Mark the position of the E-W line on the primitive circle and return the overlay to its original position to find the trend of the pole (330°). The plunge of the pole is 90° minus the dip. To plot planes and poles from the dip and dip azimuth of the plane (the plane previously plotted is δ = 32, 150) mark the dip direction on the primitive circle (Fig. 14a), rotate the overlay to bring this direction to E-W, and count the dip amount inward to find the point that represents the orientation of the dip vector.

The x value is called the easting, and the y value is called the northing. For example, the lower left coordinate in Fig. 1, 518, is 518 000 m east of the origin. Any block can be subdivided into tenths in both the x and y directions, adding one significant digit to the coordinates of the sub-block. Sub-blocks may be similarly subdivided. UTM coordinates are commonly written as a single number, easting first, then the northing, with the superscript and the trailing zeros omitted. For example, a grid reference of 196 542 in the map of Fig.

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

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