Discussion
A thrust fault differs from a reverse fault chiefly in having
Answer: A
Correct answer: a shallower dip angle
Both are compressional faults with the hanging wall moving up, and the distinction is one of geometry: a thrust dips at a shallow angle, conventionally less than about thirty degrees, while a reverse fault is steeper. The shallow dip matters because a thrust can carry rock a long horizontal distance and can produce a very large rupture area, and hence a very large earthquake.
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