Both ends of the two fault lines that run parallel with the Oregon Coast were rocked by earthquakes over the weekend. . According to the U.S. Geological Survey, on Saturday, June 10, a 4.8-magnitude quake occurred at the north end, west of Port Hardy, Canada, while a 3.5-magnitude was recorded Sunday, June 11, south to southeast of Westhaven-Moonstone, CA, near Cape Mendocino.