NOAA reports a 4.7 Richter earthquake along the Cascadia Subduction Zone early Wednesday morning, roughly 136 miles west southwest of Gold Beach, OR. The 4.7 Richter shaker was felt across a wide area, with two reports from Lincoln City.
The earthquake occurred very close to what is called the Cascadia Subduction Zone where an eastern moving Pacific tectonic plate is undercutting a stable North American plate. Geologists say every 300 to 600 years the Pacific plate jerks eastward and under the North American Plate causing a large earthquake capable of producing an earthquake and tsunami the size that struck western Japan in March of 2011.
Geologists say there is a 40% chance of a similar earthquake along the northwest American coast within the next fifty years.