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Regional 1906-earthquake scenarios warn of large casualties and economic loss; professionals urge preparedness
Summary
A multi-presenter conference reviewing scenarios for a repeat of the 1906 earthquake estimated large-scale casualties, widespread building damage and economic losses potentially exceeding $120 billion, and urged investments in mitigation, resilient critical facilities and coordinated regional recovery planning.
Experts at a regional anniversary conference reviewed modeling and preparedness recommendations addressing what a repeat of the 1906 earthquake could mean for the Bay Area.
Presenters described two scenarios: a 1906-based rupture reconstruction and a modeled magnitude 7.9 San Andreas event. Animated ground-motion maps showed rapid propagation of strong shaking across the peninsula and the Bay Area. The analysis used improved HAZUS-based models and updated building inventories.
The study estimated severe impacts on commercial buildings, displacement of households (up to a quarter-million), and casualties that could range into the thousands depending on time-of-day: nighttime estimates were lower than daytime projections that place deaths in the thousands. Direct economic losses to buildings in the study region were estimated to total on the order of $120 billion, with additional losses from fires, utilities and transportation increasing the total further.
Speakers identified vulnerable building types including older, non-ductile concrete structures and soft-story residential buildings above garages; they stressed targeted mitigation, prioritizing hospitals, emergency operations centers and fire stations for higher survivability standards. Presenters urged a combined public-private approach to preparedness, including insurance and catastrophe-reinsurance strategies and personal readiness measures for the first 72 hours after a major quake.
Conference organizers concluded that while the region has invested in strengthening infrastructure, the Bay Area remains vulnerable and must accelerate mitigation and recovery planning to reduce casualties, economic disruption and displacement.
(Attribution: summary based on conference presentations and slides describing modeled scenarios, building vulnerability, casualty and loss estimates.)
