Friday, June 17th, 2005 — Only days after a 7.0 earthquake shook most of Southern California on Tuesday, a 6.6 quake struck off the state’s northern coast to become the fourth significant shaker to jolt California this week. The 6.6-magnitude temblor hit about 125 miles off the coast of Eureka around 11:30 p.m. PT, rattling the ocean floor, while a 4.9-magnitude quake struck east of Los Angeles just a few hours earlier.