It's already been repaired. See the earthquake rod? That will hold the brick in place (i.e., keep the brick from moving out on this and the opposite face). Earthquake rods installed perpendicular to this one will help keep this crack from widening.

Actually, while earthquake rods are a big improvement they are not the final solution. I remember seeing earthquake rods on many old brick buildings in Charleston. Not sure how effective they are in a large earthquake but they were probably cutting-edge techology in earthquake-proofing buildings circa 1890.

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