Thrust faults, and especially "blind" thrust faults are very dangerous because their earthquake foci are close to the surface.... where many people live.  So what is a blind thrust fault?   Question  options:   A)  A fault that creates an earthquake of Richter scale magnitude 8 or more.   B)  A fault of unknown origin and motion that only ruptures once in its life.   C)  A fault that pushes the earth upward in strickly vertical orientation.   D)  A low angle reverse fault with no discernable scarp.

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