what is the diff between a reverse fault and a (over)thrust fault??

Answer 1

there is no difference when it comes to the relative motion of each block. (the headwall blcok moves up with respect to the footwall block)

the only difference is the fault angle. an overthrust fault has a much shalower angle then a classic reverse fault.

from http://www.answers.com/topic/geologic-fault >>>
A thrust fault has the same sense of motion as a reverse fault, but with the dip of the fault plane at less than 45°. Thrust faults typically form ramps, flats and fault-bend (hanging wall and foot wall) folds. Thrust faults are responsible for forming nappes and klippen in the large thrust belts.

Answer 2

Overthrust Fault

Answer 3

there is no difference:
overthrust fault is a geological fault in which the upper side appears to have been pushed upward by compression [syn: thrust fault, reverse fault]