Comments on: The movement of faults https://rogermarjoribanks.info/movement-faults-2/ Sat, 14 Feb 2026 08:45:10 +0000 hourly 1 https://wordpress.org/?v=3.8.41 By: What is a Geological Fault? « Roger Marjoribanks Roger Marjoribanks https://rogermarjoribanks.info/movement-faults-2/#comment-102 Fri, 09 Apr 2021 03:16:36 +0000 http://rogermarjoribanks.info/?p=1124#comment-102 […] If the FMVs are parallel to the fault plane, the fault has formed through the mechanism of simple shear: that is, the two sides of the fault have moved laterally past each other. If the arrows are normal to the fault, then the fault has formed by the mechanism of pure shear.  Pure shear may be compressional or extensional. In compression (where the FMVs point towards each other) there is a reduction in the volume of the affected rocks. In extension (where the FMVs point away from each other) there is an increase in the volume of the affected rocks. A more detailed discussion on the movement of faults can be found in my earlier blog post of that title here. […]

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