Bay Area Rapid Transit System BART

The Bay Area Rapid Transit system (BART) in San Francisco, California, sustained the 1989 Loma Prieta earthquake without damage and was operational after the earthquake. It consists of underground stations and tunnels embedded in soft bay mud deposits connected to Oakland via the transbay-immersed-tube tunnel. It was one of the first underground facilities designed with seismic consideradmis special seismic joints were designed to accommodate differential movements. Limited displacements were measured at that joint. 

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