Massive magnitude 7 earthquake strikes off CaIifornia coast, triggering t.sunami warning..
Massive Magnitude 7 Earthquake Hits Off California Coast, Tsunami Warning Issued A powerful magnitude 7 earthquake struck off Petrolia, California, on Dec. 5, at 10:44 a.m. PST. The U.S. Tsunami Warning System issued a warning for potential hazardous waves in the Pacific Ocean, spanning mid-Oregon to Santa Cruz. The earthquake occurred at a shallow depth…