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The following images showed how much damaged is sustained by buildings that are not seismically retrofitted. The loss of life, income and home are the immediate side effects. The cost of seismic retrofit for any of these buildings prior to the earthquake will be much less than the cost of repair (plus the retrofit !).
In a moderate earthquake, many housing stocks will be saved when they are properly seismically upgraded.
In a moderate earthquake, many housing stocks will be saved when they are properly seismically upgraded.
Soft Story building damaged by 1989 Loma Prieta Earthquake
source: USGS