Stay Eat Events Weather Beaches

Small Quake Shakes Off Oregon Coast This Weekend As Another Rattles Alaska

Published 02/28/21 at 5:20 PM PDT
By Oregon Coast Beach Connection staff

Small Quake Shakes Off Oregon Coast This Weekend As Another Rattles Alaska

(Bandon, Oregon) – A small earthquake shook off the southern Oregon coast early Saturday morning, clocking in at a minor 4.0 in magnitude. Meanwhile, a larger quake rattled parts of southern Alaska a bit later in the day, reminding some Oregonians of the quake there that caused a tsunami here in the '60s. (Graphic courtesy Pacific Northwest Seismic Network. Other recent tremblors are in yellow)

The undersea quake took place about 250 miles off the south coast, this time in more of a straight line westward from Dunes City instead of the usual Coos Bay or Reedsport. At a magnitude 4.0 it was not strong enough to generate a tsunami; it takes at least a 7.0 to do that. The quake shook at 5:33 a.m. Saturday at a depth of about six miles.

Latest Coastal Lodging News Alerts
In Seaside:
Includes exclusive listings; major specials now that storm watch season is here
In Cannon Beach:
Includes rentals not listed anywhere else
In Manzanita, Wheeler, Rockaway Beach:
major specials for winter
In Pacific City, Oceanside:
Winter's enticing specials now
In Lincoln City:
major winter specials now
In Depoe Bay, Gleneden Beach:
major specials this season
In Newport:
Look for many specials starting November
In Waldport
New amenities offered; specials and tempting prices now
In Yachats, Florence
Big deal available; lodgings not listed anywhere else
Southern Oregon Coast Hotels / Lodgings
Reedsport to Brookings, places to stay; winter deals

According to the U.S. Geological Survey (USGS), three people reported feeling the quake.

This quake follows a set of two minor quakes that shook a bit east of this spot last week on February 20 – one a magnitude 5.1 and the other a 4.9.

The southern Oregon coast is an area with many active faultlines, although not all of them directly related to the larger Cascadia Subduction Zone. While that faultline is where the two continental plates meet, the Blanco Fracture intersects with other sections of these boundaries, creating more seismically-active areas. The Blanco Fracture portion of the plate boundaries zone hosts a number of areas where the two sections are locked against each other in a vertical manner, and when the plate moves these locked sections can release and generate an earthquake.

The Blanco Fracture generates more than 20 quakes a year on average, so this is nothing unusual. It’s the greater Cascadia fault that is the worrisome section, which will someday release a magnitude 9.0 megathrust and create havoc along the Oregon and Washington coastlines.

Also see Oregon, Coast Earthquake Updates - Live Data Oregon, Washington, California, Tsunamis

Contrary to some popular rumors these days, the Cascadia Subduction Zone is not releasing pressure with these smaller quakes. The big one will come no matter what the smaller faultlines do.

A larger quake shook two miles off Point Mackenzie on Sunday morning, which the USGS said was a magnitude 5.3 quake. It was felt by many in the region, including in Anchorage. Although no damage has been reported so far, officials in the area are inspecting structures like bridges.

It was a massive quake in Alaska in March of 1964 that created a tsunami along the Oregon coast. That tsunami wreaked sizable damage to places like Seaside and Cannon Beach – and it killed four children in Newport. Looking Back: March '64 Tsunami That Wrecked Oregon Coast, Photos

Oregon Coast Hotels in this area - South Coast Hotels - Where to eat - Maps - Virtual Tours


More About Oregon Coast hotels, lodging.....

More About Oregon Coast Restaurants, Dining.....


Coastal Spotlight

LATEST Related Oregon Coast Articles

Waldport's Driftwood Beach Parking to Close for Oregon Coast
Wave Energy Project Work It's unknown for how long the parking lot will be closed. Sciences
Under an Italian Spell at Oregon Coast's Cannon Beach: Fultano's Pizza Cannon...
Fultano's is a unique little pizza / pasta joint with a different, delicious approach
Employee Shortage Getting Dire on Oregon Coast
It's an issue with no easy fix, and it's much more complex than simply housing. Sciences
Starlink Satellites Make Striking Appearance Above NW Oregon | Video
Today's launch of 60 Starlink satellites resulted in a long, spellbinding streak
Ghost Forest Found at N. Oregon Coast's Happy Camp a Chilling Reminder
Not a ghost forest you can normally see. Netarts, Oceanside, sciences, geology
Weirdest Science: Possible 'Ocean' Beneath the Oregon Coast, North America
Section of the Earth's crust where water does not exist in the usual forms. Geology, Sciences
N. Oregon Coast's Seaside Cautious But Hopeful for Huge Centennial Event
The cautious message of 'save the date' for Saturday, August 7 was sent out. Seaside events, history
Surprise Science About the Lowly But Delish Scallop of Oregon / Washington Coast
They may be a tasty treat but they're also kind of trippy. Marine Sciences

Back to Oregon Coast

Contact Advertise on
All Content, unless otherwise attributed, copyright Unauthorized use or publication is not permitted