We are nearing a big Cascadia rupture as a swarm of strong earthquakes hits the subducting Juan de Fuca Plate!


A cluster of earthquakes has been ongoing off the coast of Oregon early this morning, with the major ones being a M5.5 event, a M5.4, and a M5.3, in that order.

juan de fuca plate earthquake swarm, juan de fuca plate earthquake swarm april 29 2021, juan de fuca plate earthquake swarm map
Juan de Fuca plate earthquake swarm on April 29, 2021. Map via USGS

The earthquake swarm started at 2:25 PT (10:25 UTC) as shown below:

M4.3 – off the coast of Oregon
M5.4 – 287 km WNW of Bandon, Oregon; reported by 8 people on the continent
M5.2 – off the coast of Oregon; reported by 2 people on the continent
M5.3 – off the coast of Oregon; reported by 4 people on the continent
M4.1 – off the coast of Oregon
M3.9 – off the coast of Oregon

According to USGS, all of these quakes occurred at a depth of 10km (6.2 miles). But looking at different apps around, the quakes were very deep…

earthquake depths juan de fuca earthquake swarm april 29 2021
Earthquake depths at Juan de Fuca on April 29, 2021.

Why this cover up, again?

Maybe because a big earthquake is overdue along the Cascadia subduction zone, the convergent plate boundary that stretches from northern Vancouver Island in Canada to Northern California in the United States.

And as visible on the map below, the Juan de Fuca plate is linked to this very long, sloping subduction zone where the Explorer, Juan de Fuca, and Gorda plates move to the east and slide below the much larger mostly continental North American Plate.

cascadia and juan de fuca faults, cascadia and juan de fuca earthquake swarm
Cascadia subduction zone is linked to moving Juan de Fuca Fault in the Pacific Northwest. Picture: USGS

Major cities affected by a disturbance in this subduction zone include Vancouver and Victoria, British Columbia; Seattle, Washington; and Portland, Oregon.

It is the first time in several years that such a strong swarm occurs off the coast of Oregon…

Do you think it is a sign of the next Cascadia superquake and tsunami?

Here’s the best article ever written about this Cascadia disaster… And if you want to know more, I would suggest you to watch this documentary (press on the picture below):

cascadia the big one documentary


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  1. No one ever mentions that these may be DUMBS being blown up. If you notice these quakes in multiple locations around are at same depth which is a favorite. Notice how they can be in a straight line at exact same depth. Just something to ponder and it doesn’t mean they can’t lead to real quakes or there cumulative effect and still cause disasters. They have flooded DUMBS around the world and caused water levels to lower.

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