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 San Fernando earthquake. 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?
{'text': 'San Fernando earthquake', 'answer_start': 198}