5.8 quake detected 102 miles off Oregon Coast; no tsunami threat expected

By Amanda Linares (OPB)
Sept. 9, 2025 3:48 p.m. Updated: Sept. 9, 2025 11:21 p.m.

More aftershocks are likely following the earthquake off of Port Orford on the Oregon Coast, but no tsunami alerts were issued.

A 5.8 magnitude earthquake struck more than 100 miles off the Oregon Coast on Monday night, according to the U.S. Geological Survey. There are no reports of damage.

The quake struck southwest of Port Orford just after 9 p.m. at a depth of about 8.6 miles. The National Oceanic and Atmospheric Administration reports there’s no tsunami threat expected along the coast.

THANKS TO OUR SPONSOR:

As of Tuesday afternoon, at least 10 aftershocks were reported following the quake, with magnitudes between 2.7 and 5.1.

THANKS TO OUR SPONSOR:

Steven Sobieszczyk, a USGS spokesperson, said magnitude 5 earthquakes are not uncommon off the coast near the Oregon and California border.

“Since January 2020, there have been at least 40 magnitude 5 or greater quakes off the coast of Oregon and northern California," Sobieszczyk said in an email. “If you go back 25 years to January 2000, there have been 164 earthquakes of that magnitude in that area."

According to the USGS aftershock forecast for the coming week in the area, there’s a less than 1% chance of aftershocks larger than magnitude 5.

“There will likely be smaller aftershocks within the next week, with up to 2 magnitude 3 or higher aftershocks,” the forecast reads. “Magnitude 3 and higher aftershocks are large enough to be felt nearby. The number of aftershocks will decrease over time, but a large aftershock can temporarily increase the number of aftershocks.”

Anyone who felt the earthquake is asked to report it using the USGS "Did you feel it?" tool. As of 8 a.m. Tuesday, around 20 people had reported feeling the ground shake.

Related: Oregon Gov. Tina Kotek wants new state buildings to be earthquake ready

THANKS TO OUR SPONSOR:

THANKS TO OUR SPONSOR: