Stated in their 1974 book The Jupiter Effect that combined gravitational forces of aligned planets would create a number of catastrophes, including a great earthquake on the San Andreas Fault
Richard Abanes, End-Time Visions. Four Walls Eight Windows, New York, 1998; "Ten Notable Apocalypses That (Obviously) Didn't Happen". Smithsonian. 2009-11-12
http://www.smithsonianmag.com/history-archaeology/Ten-Notable-Apocalypses-That-Obviously-Didnt-Happen.html