Earthquake Risk San Onofre was redesigned for a 7.0 earthquake, but sits near faults capable of 8.0+ earthquakes – 10 times larger, 32 times stronger, and long overdue. See USGS earthquake calculator. Nelson Mar, PhD (former Senior Engineer for the original design of San Onofre Units 2 & 3), said San Onofre is not designed for current earthquake or…