The southern end of the two fault lines that run parallel with the Oregon Coast continued to rumble on Tuesday, Dec. 21. According to the U.S. Geological Survey, a 4.0-magnitude quake followed the cluster recorded Monday west of Petrolia, CA near Cape Mendocino in Northern California. 3.1 & 2.9-magnitudes followed in the same area. There were also three nearby on land earthquakes.
