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The volcano in southwest Iceland has been erupting for 85 days more or less, and until very recently it was erupting every 7-12 minutes, flowing lava for a minute or two, then subsiding. The time between eruptions was long enough for the lava to cool on the surface and the mountain to become dark. Even yesterday, though the eruptions seemed to be a bit closer together, there were long pauses, several minutes, when the mountain went dark.
No more. Something happened. Yesterday or the day before the top of the volcano, a sort of lid over the pool of lava, fell into the lava pool, and pool seemed wider afterwards. This evening when I turned on the video feed the lava flow was steady, changing very little minute to minute, flowing all the time. This means that the flow of lava emerging from the vent must be five to twelve times the flow when the eruptions were sporadic, and it seems in the night shots I see now that much of the lower lakes of lava and pooled material are glowing red and moving.
Posted in Real or Folk Tale? and tagged disaster, eruptions, flooding, geology, Iceland volcano, lava, plate tectonics by Charles Sheldon with no comments yet.
Right now, May 24, 2021, there are at least two volcanoes erupting, one in Iceland and another in the Congo. Both eruptions are big and long lasting, producing rivers of lava. The video below is the Iceland volcano, which has been erupting for a couple of weeks. To me it is astonishing to see the molten rock flowing like water, even producing waves. Even more astonishing is the realization that beneath us lie cubic miles of hot molten magma. Here in the Pacific Northwest we live beneath a line of great volcanoes, one of which exploded 40 years ago, Mount St. Helens. It seems that these great volcano areas lie along the edge of a continental plate, such that when another great plate thrusts beneath it, huge earthquakes happen. There was an earthquake here in 2001, big enough to cause damage, shake buildings, cause higher buildings to sway back and forth, and this earthquake was nowhere the size of what everyone is predicting eventually. It seems the energy of the rock thrusting beneath other rock creates friction and heat, and magma, which will burst to the surface under pressure. There are other areas, like Yellowstone, which have been called “super volcanoes” because of the size of the magma chamber beneath.
We have evidence of huge eruptions in the past, huge. We know about huge flooding of magma across thousands of square miles of land, just as we now know of enormous glacial floods in the past, not to mention asteroid strikes, some large enough to create craters fifty miles ion diameter.
So, are these two eruptions occurring now an indication of a period of greater volcanic activity? We won’t know until after it happens.
All of which to say, again, geologic time is totally different than human lifespan time-sense. Our ability to hear eye witness accounts of events is limited to, at best, 70-90 years. Then information is second-hand, then third-hand. By the time of third and fourth hand transmission memory has been lost, the stories have changed, the great event is lost in the mists of time. We humans like to erase uncomfortable history, and we do it all the time. We seem wired to forget pain, discomfort, such that we can endure it again. There is evidence that 700 to 1,000 years ago great forest fires swept the entire U.S. West, all of it, a thousand times worse than the worst fire season we have seen to date.
When I see a video like this one here I am reminded of how little we know, and how humble we should be…..
Posted in Blog Posts, Real or Folk Tale? and tagged ancient man, astewroid strike, Congo eruption, crater, geology, glacial floods, humility, ice age, Iceland eruprtiopn, Mt. St. Helens, volcano by Charles Sheldon with no comments yet.