BART EARTHQUAKE SAFETY PROGRAM Northern California Earthquake Hazards Workshop February 12, 2014
Program Objectives • Render BART system earthquake safe under Design Basis Earthquake (DBE). In general, “safe” = “noncollapse”. • To the maximum extent reasonable and prudent, retrofit portions of the system to operability under the Lower Design Basis Earthquake (LDBE). “Operability” = return to train operations within a short period of time (1 -2 weeks)
Remaining Work • Retrofit Fremont Line aerial structures between Lake Merritt and Coliseum • Complete 10 stations (7 in construction now) • Upgrade 4 aerial structure piers along Richmond Line • Retrofit interior liner in Transbay Tube (3 areas) and upgrade pumping system • Expected completion: Fremont Line 2018, Transbay Tube 2023
Other Seismic Preparedness Efforts • Earthquake Early Warning System: Provides advanced warning (15 sec to 1 min) of large earthquake ground motions approaching the BART system. • Primarily for warning of distant earthquakes. • Tied to BART train control system – slows trains to reduce derailment or other possible effects. • Feasibility study for retrofit of Berkeley Hills Tunnel, which crosses the Hayward Fault.