Have you wondered why those short, en echelon, calcite-filled fractures that all geologists have seen have a mild “S” shape? Why are the en echelon fractures oriented at an angle to the trend of the fracture zone? Which came first, the fault or the shear zone? Why are map traces of strike-slip faults straighter than dip-slip faults? How are tension cracks and shear cracks related? Why are fault-bend folds more pronounced on thrust faults than on other fault types? The answers to these and other questions can be found in Christopher Scholz's 2003 book The Mechanics of Earthquakes and Faulting...
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