Massive magnitude 7 ear.thquake
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 of 0.4 miles (0.6 km), about 39 miles northwest of Petrolia…