Tutorials (PDF) - Tectonique.net

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2SHH]8YXSVMEP1ERYEP4VSJMPISJHMKMXMWIHJSPHThe amplitude and wavelength of the fold will be automatically calculatedbased on the map corner coordinates, however in our case the amplitude willhave to be adjusted later, because the fold plunge has not yet been taken intoaccount (or you can calculate the true amplitude now from the plunge accordingto true amplitude = apparent amplitude * cos (dip) ). You may observe theoverall block geology by changing the preview to the History mode, or bymaking a block diagram, although you will probably find that not all of thefolded layer fits in the block.Step 6Now we use the dip information from the fold hinge to tilt the entire block 37°around an east-west axis. You may observe the overall block geology bychanging the preview to the History mode, or by making a block diagram.
8YXSVMEPNoteUse a Tilt event to rotate the stratigraphy.Step 7Now you can add an event to model the fault that cuts the north end of the fold.Notice that the fault offsets the west limb of the fold but does not offset theright limb. These are several ways we can explain this in Noddy: with aelliptical fault (where the slip vector magnitude varies with position), with anoblique slip translational fault, or with a rotational fault (where both magnitudeand orientation vary with position).In either case we can use the Trace From Image... function to place the fault inthe correct position and also with the correct orientation. With the Fault tracingoption, only two points can be digitized, the first point provides the origin forthe fault, and the second point controls the orientation. For elliptical androtational faults the position of the first control point is therefore crucial, as itdefines the centre of the ellipsoid and the rotation axis position respectively. Ifyou are having trouble placing the fault, you can also use the Define XYZposition menu which appears when you create a Map view of the geology.In the block below is an elliptical fault with a horizontal slip vector to achievethe variation in offset of the two limbs.
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