Earthquake briefly had one of Hollywood's most valuable screenwriters attached at the height of his fame. Universal paid Mario Puzo $125,000 to write the first draft during the summer of 1972, shortly after The Godfather had transformed him from a successful novelist into a major film-industry figure. Puzo delivered an expansive version in August, but the script's many storylines and citywide set pieces implied a budget far larger than Universal initially wanted to spend. Before he could continue revising it, Paramount moved aggressively to develop The Godfather Part II, and Puzo's existing contractual obligations required his services for the sequel. Universal was left with his large-scale draft but without the writer who had created it. Writer George Fox was then hired to continue the screenplay, while director Mark Robson helped narrow the sprawling material to fit the available budget. The final film was consequently shaped not only by creative decisions but by the competing contractual machinery of two studios trying to exploit the disaster-film boom created by The Poseidon Adventure.
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