The United States Geological Survey says a 6.3 magnitude earthquake has struck roughly 170 miles off the coast of Oregon, in the western United States.
The earthquake was detected south of Portland, in an area that has a relatively small population.
The National Oceanic and Atmospheric Administration's Tsunami Warning Centre did not immediately issue a tsunami warning for the area after the earthquake was detected.
The tremor comes just after the Pacific Northwest Seismic Network reported detecting more than 4,500 small earthquakes over a two week span, deep underneath the Olympic Peninsula and outer Vancouver Island. The areas impacted by those tremors also included an area spanning from near Eugene, Oregon — close to where the Thursday earthquake was seen — down to the Siskiyou Mountains in northern California.
Those earthquakes were part of a phenomenon known to scientists as "episodic tremor and slip" or "slow slip", which apparently happens on a regular basis along Cascadia's tectonic plate boundary.
The earthquake struck 178 miles off the coast of Coos Bay, USGS reported. There is no threat of a tsunami from this earthquake, the USGS said.
A M6.3 earthquake has occured 284km WNW of Bandon, Oregon. No tsunami warning has been issued. More here: https://t.co/uyXClrJ8Rf including a Did You Feel It? link pic.twitter.com/B8LVW0BrXy— USGS (@USGS) August 29, 2019