The figure below is a schematic section showing the initial stages of development of a thrust fault

Q. The figure below is a schematic section showing the initial stages of development of a thrust fault (FF’) having a typical ramp and flat geometry, with the thrust sheet being transported from east to west. With respect to the synform and antiform created in Stage 2, which one of the options below is CORRECT for the next increment of movement on the fault plane?

A. The synform and the antiform will both move westward.

B. The synform will remain in position, while the antiform will grow in amplitude.

C. Both synform and antiform will grow in amplitude.

D. The geometry will remain unchanged.

Ans: The synform will remain in position, while the antiform will grow in amplitude.