When California's "Big One" earthquake strikes, the potential consequences could be catastrophic. Experts warn of widespread destruction, particularly in densely populated areas like Los Angeles and San Francisco. Infrastructure, including bridges, highways, and buildings, may suffer severe damage, leading to significant casualties and disruptions. Emergency services could be overwhelmed, hampering rescue efforts. The economic impact would be substantial, affecting businesses and industries while causing long-term challenges in recovery and rebuilding. Additionally, the event could trigger landslides, fires, and secondary hazards, complicating the situation further. Preparedness and resilience strategies will be crucial in mitigating the effects of such a disaster.