An investigation by the Los Angeles Times indicates that more than a thousand concrete buildings in the area built before the mid-1970s are at risk of collapse in the event of a major earthquake because they are non-ductile. Very few of the buildings have been seismically retrofitted. "[A]s structural engineers reported to the state after the Northridge earthquake, the collapse of a single concrete building 'has the potential for more loss of life than any other catastrophe in California' since the 1906 San Francisco earthquake," write Rong-Gong Lin II, Rosanna Xia and Doug Smith.

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