The Collaborative International Dictionary of English v.0.48:

Fault \Fault\, v. t. [imp. & p. p. Faulted; p. pr. & vb. n.
   Faulting.]
   1. To charge with a fault; to accuse; to find fault with; to
      blame. [Obs.]
      [1913 Webster]

            For that I will not fault thee.       --Old Song.
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   2. (Geol.) To interrupt the continuity of (rock strata) by
      displacement along a plane of fracture; -- chiefly used in
      the p. p.; as, the coal beds are badly faulted.
      [1913 Webster]