Six earthquakes rocked the southern end of two fault lines that run parallel with the Oregon Coast Friday, Sept. 22 at Cape Mendocino in Northern California. According to the U.S. Geological Survey, the largest measured 5.7-magnitude. It was located west of Ferndale, CA. The aftershocks measured 3.2, 2.9, 3.1, 3.0 & 3.9.