Cluster of Alaskan islands could be single, interconnected giant (super)volcano by 1KIKI

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Cluster of Alaskan islands could be single, interconnected giant (super)volcano

POSTED BY: 1KIKI
UPDATED: Monday, December 14, 2020 01:39
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Sunday, December 13, 2020 5:27 PM

Goodbye, kind world (George Monbiot) - In common with all those generations which have contemplated catastrophe, we appear to be incapable of understanding what confronts us.

Cluster of Alaskan islands could be single, interconnected giant (super)volcano

WASHINGTON—A small group of volcanic islands in Alaska’s Aleutian chain might be part of a single, undiscovered giant volcano, say scientists presenting the findings Monday, 7 December at AGU’s Fall Meeting 2020. If the researchers’ suspicions are correct, the newfound volcanic caldera would belong to the same category of volcanoes as the Yellowstone Caldera and other volcanoes that have had super-eruptions with severe global consequences.

The Islands of the Four Mountains in the central Aleutians is a tight group of six stratovolcanoes named Carlisle, Cleveland, Herbert, Kagamil, Tana and Uliaga. Stratovolcanoes are what most people envision when they think of a volcano: a steep conical mountain with a banner of clouds and ash waving at the summit.

Researchers from a variety of institutions and disciplines have been studying Mount Cleveland, the most active volcano of the group, trying to understand the nature of the Islands of the Four Mountains. They have gathered multiple pieces of evidence showing that the islands could belong to one interconnected caldera.

Unlike stratovolcanoes, which tend to tap small- to modestly-sized reservoirs of magma, a caldera is created by tapping a huge reservoir in the Earth’s crust. When the reservoir’s pressure exceeds the strength of the crust, gigantic amounts of lava and ash are released in a catastrophic episode of eruption.

Caldera-forming eruptions are the most explosive volcanic eruptions on Earth and they often have had global effects. The ash and gas they put into the atmosphere can affect Earth’s climate and trigger social upheaval. For example, the eruption of nearby Okmok volcano in the year BCE 43 has been recently implicated in the disruption of the Roman Republic.

The proposed caldera underlying the Islands of the Four Mountains would be even larger than Okmok. If confirmed, it would become the first in the Aleutians that is hidden underwater, said Diana Roman of the Carnegie Institution for Science in Washington, D.C., co-author of the study.

https://news.agu.org/press-release/cluster-of-alaskan-islands-could-be
-single-interconnected-giant-volcano/

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Monday, December 14, 2020 1:39 AM

SIGNYM

I believe in solving problems, not sharing them.

interesting, thanks!

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If we did not MAKE men poor - William Blake!
#WEARAMASK

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