In 1968, Schwarzenegger and fellow bodybuilder Franco Columbu started a bricklaying business. The business flourished thanks to the pair's marketing savvy and an increased demand following the 1971 <answer>San Fernando earthquake</answer>. Schwarzenegger and Columbu used profits from their bricklaying venture to start a mail order business, selling bodybuilding and fitness-related equipment and instructional tapes.
What natural disaster in 1971 contributed to the success of Schwarzenegger's business?
San Fernando earthquake