6.6 Earthquake Juan de Fuca Plate Subduction Zone, Small Quakes Rattle Cascadia

small earthquakes April 23 Mt Rainier

 

The earth has been quite active since the huge Boxing Day Quake offshore Indonesia and then the Great Tohoku quake in Japan.  Huge quakes have shaken Chile and New Zealand and I noticed all this last several months that the spreading ridges in the Atlantic Ocean and Antarctica are also quite active.  Now we had another fair sized quake offshore Vancouver Island.

Magnitude 6.6 earthquake strikes off British Columbia

world earthquake map april 24 2014

Even more troubling is the increasing activity of some of the local volcanoes in Cascadia:  Volcanoes | Pacific Northwest Seismic Network

April 23 2014 earthquakes at volcanoes in Washington state

juan_de_Fuca is a subduction zone.  It is also a hot spot.  It could also be releasing gases that are causing some of the problems for ocean life forms which are already disturbed by Fukushima pollution problems.

juan de fuca plate

 

The #1 volcano to watch now is Mount Rainier.  And it is shaking this last week.  Most pre-volcanic eruptions have small quakes, not great ones.  So this bears watching closely because if this volcano blows, it will melt all the glaciers on top and these will form violent lahars that will have a huge amount of boulders, rocks, trees, buildings and water and will wipe out all the towns and parts of Tacoma, Washington and perhaps damage Seattle itself.

Mt. Rainier volcano has quakes April 24 2014

Not to mention deposit a huge amount of ash all over the land to the east of the volcano.

Screen shot 2014-04-24 at 9.16.35 PM

The entire Pacific Northwest is having small but troubling earthquakes this week.  I have noticed over the course of the last year, that more and more higher activity earthquakes have been shaking not only the entire West Coast but even further in the interior especially in Oklahoma.

 

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5 Comments

Filed under Geology

5 responses to “6.6 Earthquake Juan de Fuca Plate Subduction Zone, Small Quakes Rattle Cascadia

  1. Peter C.

    Haven’t been able to feel any earthquakes since i moved unto the boat.
    Returning to terra firma in a few months so i will be able to feel them again here on Vancouver Island.

  2. emsnews

    You are fortunate there were no tsunamis. I am happy for this, too. The danger to you in a tsunami isn’t the wave, it is the DEBRIS that slams into your boat. So take care!

  3. Ziff house

    Nothing here, just inland, local press make big silly noise, quake kit will save you lol.

  4. JimmyJ

    Not sure how Juan de Fuca plate can be considered a hotpsot. There is seafloor spreading at the plate perimeter which is driven by mantle convection. And the volcanic arc behind this which is common for a subduction zone as the subducting plate melts and rises. The Juan de Fuca (and Explorer) plates are a remnant of the much bigger Farrallon plate. This makes the current spreading zone look rather tiny compared to say the Mid-Atlantic Ridge.

    My understanding of a hotspot by comparison is that they are driven by core-mantle heat transfer, with a more direct path of magma from deep in the mantle. And they are typically located in the middle of a plate not at the margin. There are seamounts fairly close to the old Farallon margin that are supposedly hotspot driven caused by the Bowie Hotspot but they are out on the Pacific plate, not right at the margin.

    http://goo.gl/nkWVrm

  5. emsnews

    IT IS NOT. It is a SUBDUCTION ZONE. And yes, hot spots are generally in the middle of plates except when these plates move and they are stationary and then several plates such as here in the Pacific, are in one spot then the hot spot is really activated due to fault lines coinciding with the hot spot. We may eventually see some Hawaii-type islands offshore some day.

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