Damage to the town of Rio Negro was extensive along a long thin ridge lying between Rio Forrahue and Rio Llay-Llay and on the adjacent banks. The damage was largely produced by mass movement, although the actual oscillatory ground movement may have been greater on the higher parts of the ridge. A possible north-south fault is indicated. The subsoil is glacio-fluvial sands and gravels. Recommendations for reconstruction are given.

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