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Showing results for tags 'volcano'.
Found 17 results
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Fossilized Olive Leaves are Reminder of Prehistoric Volcano on Santorini
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Hey all, I'm a newbie so HI! I found this object in the Laramie formation in Colorado (approx 70m old). It was by itself, but feet away from a fossil bed. No other pieces were found vertically and it was found below a vegetative strata that is chock full of plant bits.. I mean heavily loaded with plants. There are coal seams in it too. The holes are interesting: is it fossil or pumice? If pumice.. it's nuts because nearest volcano is 200+ miles away (which erupted approx 4,000 yrs ago). The object weighs slight less or same as fossil (roughly), def not heavy like decomposing granite. The black object is the pumice or fossil, an example of the vegetative strata is here too.. light brown with darker patches of plants material. What cha think?
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I found pumice in the Little Harpeth River in the Nashville Tn area. Does anyone know why it would be there? I can't find a history of volcanic activity in the area.
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About a 50 minute drive from our house is a volcano that last erupted underwater during the Pliocene era. It was part of a fault which stretches from Spain almost to Morocco and emerged from the ancient sea around 6.2 million years ago, moving the shore of the Iberian peninsula 40 KM South. On its slopes are garnets galore which are regularly being washed down from its hollow summit during rains. Sunday we spent an enjoyable couple of hours there, it is open for walking the routes as a public attraction. We regularly spend some time here, it is called Volcán de la Granatilla or Hoyazo de Níjar. We collected a few hundred garnets
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Good morning, Can you help me to identify this fossil please? It was found in Iceland. In the Snaefellsnes region (west), next to the Eldborg crater. Thank you
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Hunga Tonga Hunga Ha'apai eruption is apparently the largest explosive eruption in more than a century.
MeargleSchmeargl posted a topic in Geology
If anyone here pays attention to volcano-related news, you probably heard about the incredibly violent explosive eruption that almost completely obliterated the island of Hunga Tonga Hunga Ha'apai. Originally it was calculated to be a 4 on the Volcanic Explosivity Index (between 0.1 and 1 cubic kilometers of material ejected), but lately volcanologists have gotten more accurate data relating to the event including scans of the seafloor where much of the island once stood. With this data they found out that the Caldera as a whole had gotten a whopping 750 meters deeper than it was before. Based on this, it's been estimated that the eruption ejected between 13 and 16 cubic kilometers of material, putting the eruption 2 orders of magnitude larger than previous estimates as a VEI 6 eruption rather than VEI 4. What's even more incredible is that this eruption was apparently even larger than the 1991 eruption of Mount Pinatubo, and is the largest explosive eruption on the planet in 110 years, when Novarupta had a massive VEI 6 eruption in 1912. To add a cherry on top, I remember that the actual volcanic explosion itself lasted all of 10 minutes. Yeah, this is definitely one for the record books. https://youtu.be/2TbWskpiY6A -
Not sure anybody noticed this volcanic crater feature at the Yellowstone. I recently saw this using Goes East map, it really stands out. The last supereruption of the Yellowstone Caldera, the Lava Creek eruption 640,000 years ago, ejected approximately 1,000 cubic kilometres (240 cu mi) of rock, dust and volcanic ash into the atmosphere. Overlying land collapses into the emptied magma chamber, forming a geographic depression called a caldera. Don't think that was a dried out lake bed existed during the last ice age.
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Future fossils being made in Icelandic volcano eruption.
DPS Ammonite posted a topic in General Fossil Discussion
See amazing live video of volcano eruption in Iceland. As the flow goes over wet meadows, steam happens. I would imagine that underground creature will be trapped and become fossils in the future. You can rewind it a few hours and see the flow progression, helicopters and scientists probably collecting fresh lava samples. Note at least 5 people next to flow at bottom of detail photo. https://www.ruv.is/frett/2021/03/20/beint-vefstreymi-fra-eldstodvunum On 14:23, March 21st the right wall of the crater collapses send a flow down the side.
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Live feed of erupting volcano near Reykjavic, Iceland. I just saw several people at the edge of the flow. https://www.ruv.is/frett/2021/03/20/beint-vefstreymi-fra-eldstodvunum
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Sometimes geologic change moves faster than Google can keep up. Krakatoa volcano as it appears in Google Maps: And in Google Maps 3D: A 2018 eruption destroyed the volcanic cone. The new imagery is draped over the older elevation model. More on the eruptive history of the volcano:
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Why did White Island (Whakaari) Volcano, New Zealand, erupt as it did?
Oxytropidoceras posted a topic in Geology
A short, concise, and understandable explanation of the tragic eruption of White Island (Whakaari) Volcano, New Zealand, is: What caused the White Island volcano to explode the way it did? ABC News https://www.youtube.com/watch?v=_93KoBrZEwY A concise description of White Island (Whakaari) Volcano, New Zealand, can be found in “Magmatic-hydrothermal system at White Island volcano, North Island, New Zealand, Carlos Jimenez, on pp. 35-43 of: JCU SEG Student Chapter, Guide Book New Zealand, North Island Field Trip 2015 https://www.segweb.org/pdf/events/2016/16JCFT-Guidebook.pdf Deepest sympathies, Paul H.-
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Extinct volcano has woken up and scientists say it could erupt 'at any moment' By Emily Dixon, CNN, June 7, 2019 https://www.cnn.com/2019/06/07/europe/russia-volcano-scli-intl-scn/index.html The Russian volcano Bolshaya Udina, a Vesuvius in power Intrenational news, June 7, 2019 https://www.tellerreport.com/post/2019-06-07---the-russian-volcano-bolshaya-udina--a-vesuvius-in-power-.ryqBRM_A4.html The paper is: Koulakov, I., Komzeleva, V., Abkadyrov, I., Kugaenko, Y., El Khrepy, S. and Al Arifi, N., 2019. Unrest of the Udina volcano in Kamchatka inferred from the analysis of seismicity and seismic tomography. Journal of Volcanology and Geothermal Research.379, pp. 45-50. http://www.ipgg.sbras.ru/ru/science/publications/publ-unrest-of-the-udina-volcano-in-kamchatka-2019 http://www.kcs.dvo.ru/ivs/publication/volc_day/2019/art22.pdf Yours, Paul H.
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Here is a great giude from the USGS that summarizes the threats that local volcanos pose to the US. Link 2018 Update to the U.S. Geological Survey National Volcanic Threat Assessment by EWART.
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Here is an interesting USGS summary of the recent volcanic eruption in Hawaii that says 716 buildings were destroyed, 875 acres of new land created and the Kilauea caldera subsided over 1,600 feet. Preliminary summary of Kīlauea Volcano’s 2018 lower East Rift Zone eruption and summit collapse link I find it interesting that the volume increase of the collapsed Kilauea Caldera equaled 1.2 million cubic yards while only 1 million cubic yards of lava erupted along the East Rift Zone. Somewhere along the East Rift Zone there is at least 200 million cubic yards of magma that may be liquid or may have hardened. This estimate of the volume of magma that moved to the east does not include the magma from Puʻu ʻŌʻō caldera collapse. I bet that the land rose in the East Rift zone by at least the amount of the increase in volume in the two collapsed calderas less the magma erupted. The magma in the East Rift Zone that first erupted was thought to have been leftover from the 1955 rift eruption based on its chemical composition. The magma currently under the East Rift Zone may someday surface at a later date. I also found it interesting that the USGS said that the Puʻu ʻŌʻō Caldera collapsed first then the magma moved east causing earthquakes in Puna. I would think that the magma moved first, causing the caldera to collapse.
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Does anyone else have an opinion on this article? http://www.geologypage.com/2018/07/yellowstone-super-volcano-has-a-different-history-than-previously-thought.html My opinion is that it will be proven false. It will be proven that the plume theory is still the best theory to explain the Yellowstone Hotspot. Plate subduction invariably creates a chain of volcanoes parallel to the plate edge (as in the Cascades). I can not see how a plate subduction would create the pattern found in the Yellowstone chain. A chain, which by the way, closely resembles island arcs in the Pacific which are plume driven.
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I found this near Cottonmouth creek, 8 miles south of Austin. Some material throughout the creek looks to be lithified beach sediment. The extinct volcano called " Pilot Knob" is said to have erupted roughly 80 million years ago. The rock is about 2.5" inches long.
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http://on.natgeo.com/2dVq5l2
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