If a fault occurs in an area where rock layers have been folded, which type of fault is it likely to be? why?

Answer 1

Almost all folds are cored by thrust/reverse faults, and sometimes cut through the fold.

Answer 2

Fault is basically a natural mechanism to release strain. So the attitude of fault and its sense of slip will largely depend on the direction and magnitude of pressure applied to the country rock. Since your country rock is already folded, the form surfaces of those folds or their axial planes may play some role in determining the geometry of the faults generated. But that also depends on the competency of the rocks and several other factors.
What QFL 24-7 has said is not correct, folds having faults at the core is not a general rule.
On the other hand I am inclined to agree with nastyasshole as it is a reasonably good answer to your question in the form it was asked.

Answer 3

It really depends on the strain applied. Are you asking about strains different from the original folding event, or contemporaneous with the folds. Your question really can't be answered as asked.

Answer 4

IT COULD BE A TEUTONIC PLATE SLIPPAGE....OR IF EXTREME HEAT ESCAPE HAPPENS,COULD BE VOLCANIC......ANY NUMBER OF POSSIBLE OCCURANCES...AND WIERD AS IT SOUNDS IF THE EARTH ROTATES OFF OF NORMAL 23 DEGREES THIS COULD SPEED-UP THE CATASTROPHIC EVOLVMENT....