Earthquake (film) - Production - Sound Effects

Sound Effects

Universal Studios and Jennings Lang wanted Earthquake to be an "Event Film" - something that would draw audiences in to the theatre multiple times. After several ideas were tossed about (which included bouncing styrofoam faux "debris" over audience members' heads), Universal's sound department came up with a process called "Sensurround" - a series of large speakers and a 1,500 watt amplifier made by Cerwin-Vega, that would pump in sub-audible "infra bass" sound waves at 120 decibels (equivalent to a jet airplane at takeoff), giving the viewer the sensation of an earthquake. The process was tested in several theatres around the United States prior to the film's release, yielding various results. A famous example is Grauman's Chinese Theater in Hollywood, California, where the "Sensurround" cracked the plaster in the ceiling. The same theatre premiered Earthquake three months later – with a newly-installed net over the audience to catch any falling debris – to tremendous success.

The "Sensurround" process proved to be a large audience draw, but not without generating a fair share of controversy. There were documented cases of nosebleeds generated by the sound waves. When the film premiered in Chicago, Illinois, the head of the building and safety department demanded the system be turned down, as he was afraid it would cause structural damage. In Billings, Montana, a knick-knack shop next door to a theatre using the system lost part of its inventory when items from several shelves were thrown to the floor when the system was cued during the quake scenes.

Sensurround was used again for the films Midway (1976), Rollercoaster (1977) and Battlestar Galactica (1979).

The 2006 Universal Home Video DVD release features the original "Sensurround" 3.1 audio track, duplicating the original theatrical "Sensurround" track (but oddly in mono directed to the front 3 speakers rather than the original stereo mix), but sadly no actual 'rumble' generator was used and its only the two control tones that activated the generator that can be heard. In addition, the film's original soundtrack was remixed in Surround Sound 5.1 which was simply a tag as once again only the control tones feature on the track."

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