

Various interconnected people struggle to survive when an earthquake of unimaginable magnitude hits Los Angeles, California.
Practical Effects
Miniature skyscrapers getting obliterated — pre-CGI destruction porn.
Sound
Sensurround bass cannons physically rattled 1974 audiences.
Production
Universal built a hydraulic floor that shook an entire soundstage.

Director
Mark Robson
Trivia, insights & behind the scenes
Sensurround required special heavy speakers in theaters; the system was later used for Midway and Rollercoaster before dying out.
This film essentially created the 70s disaster movie template that Airport and The Towering Inferno would perfect — ensemble cast, multiple soap opera subplots, then catastrophic payoff.
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