Below is a, MAP-VIEW diagram of a right-lateral strike-slip fault zone. I have d

Question

Below is a, MAP-VIEW diagram of a right-lateral strike-slip fault zone. I have drawn in the trace of the fault for you with sense of shear indicated by arrows. (DO NOT EDIT THE IMAGE/PLACE ANSWERS ON IMAGE, EXPLAIN ALL ANSWERS USING WORDS. SIMPLY REFER TO THE IMAGE WHEN EXPLAINING).

Indicate which bend (A or B) is right "step-over" and a left "step-over" and which bend (A or B) would be a releasing bend and a restraining bend.

At each bend, indicate what type of fault would occur (thrust or normal) and describe the general orientation of the faults relative to the north arrow on the map (e.g., N-S, E-W, NW-SE, NE-SW).

Label the bends with the appropriate general stress field (i.e., transpression or transtension).

Which bend is sometimes called a “pull-apart basin”? Why?

Explanation / Answer

Right step over is bend B and left step over is bend A. Bend B is a restraing bend and bend A is a releasing bend. At bend B thrust fault will be there and at bend A there will be a normal fault. Bend B orientation of faults will be NE-SW and bend A orientation of faults will be NW-SE. Bend A is a pull apart basin as extension is there so normal faults will occur and pull apart basin is created. Bend A is transpression bend B transtension (general stress fields).

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