![]() The line created by the intersection of two surfaces. You saw in the above exercise how one can map H) Use the protractor to measure the trend, the angle from N of the cut-off line, using the quadrant the line descends towards.īonus (1 point): Draw the structure contours on the other side of the fault if there was 150 m of dextral offset.įor a planar surface, a topographic surface and the map expression G) Draw and label the cut-off line, which is the lineįormed by the truncation of the stratigraphic formation top surface You will need to use your map scale to convert the real distance to the map distance. Report that distance here.Ĭontours for the stratigraphic formation top that match the fault structure contour values, truncating each of them against Top with a 100 m contour interval using the appropriate trig function. Truncates against the equivalent structure contour for the fault.Į) Compute the map distance between strike Draw and label a strike line for the top surface of a stratigraphic formation so that the strike line N20E - 40SE (orientations for the other two are given on the map). In the top map the planar surface is oriented The top of a stratigraphic formation that is truncated by the fault. To measure the distance between the strike lines in a directionĭ) The center of the star marks a point on Measure the perpendicular spacing between the strike lines and then use theĪppropriate trig function above to compute the dip amount. ![]() Of the fault (you will need a protractor to answer this)?Ĭ) What is the dip angle? You will need to The assumption here is that there is no significant topography.Ī) The contours shown are on a fault surfaceĪnd the numbers are meters above sea level. One of the three structure contour maps provided below (as specified by the instructor) to answer the following questions. distance between contour strike lines = contour.These are amazingly useful - commit them.Powerpoint presentation that goes through the mechanics of working with structure contours on a plane.from strike and dip one can construct the structureĬontours if you know the x,y,z position of one point, or canĬalculate strike and dip if giving the structure contours.the contour lines are evenly spaced, with spacing distance.they are straight lines with a trend parallel to the.Structure contours of a plane follow these rules: When contouring you are assuming that for someĪrea with data located by x, y values, the z values form a smooth continous surface. Isopach maps are where you are contouring the With contaminant plumes the z parameter is the concentration of Of gravity, or the strength of a magnetic field. You can contour geophysical parameters such as the acceleration In this case the z axis instead of beingĮlevation can be any physical/chemical parameter. You can also contour and 'map' other features For example the surface created by the top Your surface does not have to be continuous everywhere,īut can be truncated. There are some differences between standard topographic As we will see in later labs one can also map the density of point data. However, one can get much more sophisticated and contour for example the amount of offset on a fault surface (which shows a very interesting pattern). Geologic surfaces commonly mapped in this way are: Structure contour maps are basically the sameĪs topographic maps, where the surface being mapped is some geologic The strcture is basically that of an asymmetric syncline with a steeper SW limb. ![]() be able to interpret the structure contoursĮxample of a structure contour map from the USGS.be able to use Surfer (or equivalent software).construct map pattern of a contact from structure.Local strike and dip) from structure contours. be able to calculate surface traits (e.g.know the definition of a structure contour. ![]()
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