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Are Exceptionally Violent Volcanic Eruptions More Common Than We Think?  Part 2 of 2

Posted by agimarc on 2022-07-01
Posted in: Eruptions-historic, Science. Tagged: Andesite, Basalt, Dacite, Haetepe, Macauley Island, Minoan eruption, Rhyolite, Sandy Bay Tephra, Santorini, Taupo, tsunami. Leave a comment
Landsat image of Lake Taupo on New Zealand North Island.  Image courtesy NASA Landsat, 2005 via Wiki

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Are Exceptionally Violent Volcanic Eruptions More Common Than We Think?  Part 1 of 2

Posted by agimarc on 2022-06-15
Posted in: Science. Tagged: atmospheric density waves, detonation, Hunga Tonga, Krakatau, tsunami, violent. Leave a comment
Follow-on Hunga-Tonga eruption on Jan 16.  Image courtesy Tonga Geological Services via teleSUR, Jan 17
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Ksudach Caldera System, Kamchatka

Posted by agimarc on 2022-06-01
Posted in: Asia, Volcanoes. Tagged: Andesite, Caldera, caldera lake, Dome, Kamchatka, Ksudach, Shtyubel, tuff ring. Leave a comment
Ksudach volcano with two crater lakes. Breached Shtyubel volcano is in the northern portion of the main caldera. Note denuded flanks via the 1907 eruption. Volcanic structure at the One O’clock position is unnamed. Screen capture from Google Maps.
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Volcanism along the Northern EPR 9.8° – 17° N

Posted by agimarc on 2022-05-15
Posted in: Pacific Islands, Volcanoes. Tagged: Basalt, black smoker, East Pacific Rise, mid-oceanic, ridge, Rift, white smoker. 1 Comment
Location of RISE Project area at the Northern East Pacific Rise. Image courtesy Wiki
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Easter Island, Chile

Posted by agimarc on 2022-05-01
Posted in: America C & S, Volcanoes. Tagged: Basalt, East Pacific Rise, Easter Island, Moai, Poike, Rano Kau, Rapa Nui, Terevaka. 5 Comments
Satellite image of Easter Island. Three main shields are clearly visible. Rani Kau is lower left. Terevaka is upper center. Poike is far right. Most recent lava flows are clearly visible in the center of the island. Collapse caldera in Rano Kau is clearly visible. Image courtesy ESA, 2019
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Central Madagascar Volcanic Fields

Posted by agimarc on 2022-04-15
Posted in: Africa, Volcanoes. Tagged: Ankaratra, cinder cones, Itasy, maar, Madagascar, monogenetic, phreatic, rifting, Vaninankaratra. Leave a comment
Central Madagascar volcanic field. Note multiple cinder cones in the field. Image courtesy WUSTL, 2016
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Apaneca Range, El Salvador

Posted by agimarc on 2022-04-01
Posted in: America C & S, Volcanoes. Tagged: Ahuachapan, Andesite, Apaneca Range, Ataco, Caldera, coffee, El Salvador, geothermal, hydrothermal, Laguna Verde. Leave a comment
Apaneca Range from the S. Cerro de Apeneca on the left, Las Ninfas – Laguna Verde complex in the center. Cuyanausul, Cerro de la Rana, Cerro Aguila, Cerro los Naranjos to the right. The Concepcion de Ataco Caldera is on the other side of the range, obscured by the line of volcanic cones. Image courtesy Lee Siebert, 1999 via Smithsonian GVP
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Diky Greben and the Kurile Lake Caldera, Kamchatka, Russia

Posted by agimarc on 2022-03-15
Posted in: Asia, Volcanoes. Tagged: Andesite, Dacite, Debris avalanche, Diky Gerber, Dome, ignimbrite, Iliinsky, Kamchatka, Kurile Lake. 4 Comments
Diky Greben volcanic complex from Kurile Lake. Image courtesy Wiki
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Hokkaido 5: The Tokachi Volcanic Group, Japan

Posted by agimarc on 2022-03-01
Posted in: Asia, Volcanoes. Tagged: backcountry, Caldera, Diesetsuzan, Hokkaido, Taietsu, Tokachi, Tokachidake. Leave a comment

Phreatic eruption at Tokachi Dec 1988. Magmatic explosion, incandescent blocks, and a small pyroclastic surge down the N flank of the volcano. Image courtesy Japan Meteorological Agency1988, via Smithsonian GVP
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The Atka, Korovin, Kliuchef Volcanic Complex, Aleutians, Alaska

Posted by agimarc on 2022-02-15
Posted in: America N, Volcanoes. Tagged: Aleutians, Andreanof, Atka, Caldera, Dacite, Kliuchef, Korovin, Sarychef. Leave a comment
Greater Atka Volcano complex with the caldera, Korovin and Kliuchef labeled. Image courtesy Lu and Dzurisin, 2014, via Smithsonian GVP
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    • Are Exceptionally Violent Volcanic Eruptions More Common Than We Think?  Part 2 of 2 2022-07-01
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    • Ksudach Caldera System, Kamchatka 2022-06-01
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