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Using data from more than two dozen seismometers, they traced its likely origin to a spot roughly 120 miles off the San Diego coast.
That spot is in the general vicinity of Warning Area 291, a huge swath of ocean used for military training exercises. The Navy operates a live-fire range on San Clemente Island, which is within Warning Area 291 and sits about 65 miles from Mission Bay.
Cmdr. William Fenick, another local Navy spokesman, said no San Diego-based warships were conducting operations in Warning Area 291 that day.
“We don't know at this time where this earthquakelike sensation came from,” Fenick said.