7 comments on “Hayes Volcano, Alaska – another previously unknown volcano

    • Thanks a lot for your kind words. Interesting mountain. Almost too close for comfort. Always worry about things that weren’t recognized as volcanoes. Would just as soon not be surprised. Best to you and yours. Cheers –


  1. Hi agimarc, thanks for another interesting piece! Some thoughts: In his article about Flat Slab Subduction Matt described the Yakutat microplate as a less dense slab that does not sink as fast as normal oceanic plate would, thus creating flat slab subduction and a non-volcanic zone (the Denali Gap). I understand Hayes volcano is located at the western edge of the Yakutat. Would it not be more likely that volcanic activity decreases as the terraine moves NW? I would rather expect Hayes and then Spurr go extinct over time than becoming more active. But then, as you said, one never knows with such a mess below your country! 😉


    • P.S. With that “mess”, I have always wondered why Alaska (as well as the Aleutian Islands) are so quiet compared to say Kamchatka. It is perhaps once in a year or two that some exitement about an erupting volcano comes up, while in Kamchatka/Kuril Islands there are always four to six erupting simultanously. They can barely follow their volcanoes with changing the alert levels…


      • Howdy Granyia – I think the difference is that there is a triple point junction between three plates coming ashore in Kamchatka while here in Southcentral AK we have an accreting collision (like India and Tibet) changing to a subduction collision as you move SW along the line of impact. Cheers –


    • Howdy Granyia – Hope all is well with you and yours.

      Matt made some good points about the Yakutat and I don’t have any substantive arguments with his points. Most interesting thing I found working this up was the double subduction with Yakutat on top and Pacific underneath. Don’t know of a region like that. Wondering if the double subduction injects more cold matter into the region than the mantle can handle for a while thereby decreasing initial melt supply to the surface. OTOH, over time, it should act a lot like a flat plate region, with significant injection of eruptible materials into local volcanoes like Colorado, Utah and Mexico. Haven’t decided what to agree with vis a vie the supposition that activity would decrease as the terrane moves NW, which might nicely explain the Denali Gap. But Hayes was recently active – vigorously active within the last couple thousand years – and plate movement does things on a time scale a few orders of magnitude longer. I suppose that I am well into head-scratching on this one. There is so much we don’t know. Cheers –


  2. This is an impressive animation of the seismic waves rolling through North America (from the 8.3 earthquake in Central Chile on 16/09/2015). Up and down movement is shown from deep red (up) to deep blue (down). Data collection by IRIS through the US seismic network.



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