Flujo piroclastico, Volcan Santiaguito 9 de mayo, 2014 (6 de 8)

Video (6 de 8) de una series de flujos piroclasticos (de bloques y ceniza) que ocurrieron el 9 de mayo del 2014, generado por colapsos del domo volcanico Santiaguito, en la barranca del Rio Nima I. El video fue tomado por Julio Cornejo de observatorio vulcanologico del Santiaguito (OVSAN) operado por el Instituto Guatemalteco de Sismologia, Vulcanologia, Meteorologia e Hidrologia (INSIVUMEH). Observe el frente del flujo desplazandose por el canal del rio, a una velocidad relativamente baja, y a punto de detenerse al inico del video, y luego mas tarde en el video, se ven flujos pyroclasticos que pasan arrancando arboles. Este es un video realmente unico!. Para mayor informacion sobre el volcan Santiaguito visite la pagina de vulcanologia del INSIVUMEH: www.insivumeh.g...
A continuacion una descripcion en ingles de lo que aparentemente se puede ver en distintas partes del video.
00:00 to 00:06
First slow moving PDC front comes into scene, moving from left to right on the opposite bottom part of the channel. There seems to be only a moderate amount of ash, and to some extent the overriding cloud seems to vanish in parts (maybe due to a large water vapor component?), although some ash clearly lingers in the air.
00:07 to 00:10
A similar PDC wave is seen following a similar path.
00:11 to 00:18
The clouds rapidly lift, possibly aided by convection, and perhaps dominated by gases (mainly water vapor and droplets) and with relatively low ash.
00:19 to 00:24
A similar PDC wave comes across the scene in the center of the channel. The PDC is carrying logs and depositing them in this scene. The cloud of ash and gases/vapor doesn't dissipate that quickly and remains over the area.
00:25 to 00:30
A continuous PDC can be seen moving across the channel bottom, carrying more rocks and logs, which move relatively slow and seem to come to rest.
00:31 to 01:00
A series of PDC pulses seem to come across the area, producing an increase in ash and gases/vapor rising from the channel and obscuring the actual flow processes.
01:01 to 01:10
The ash rising from the PDCs increases dramatically, and the sound of crushed and uprooted trees and vegetation (and perhaps colliding blocks) becomes very intense.
01:11 to 01:14
A tree (~ 15 m tall), presumably at the slope of the channel wall, is repeatedly hit by the PDCs and violently taken down in a matter of ~ 2 seconds. The noise of crushed vegetation (and perhaps colliding blocks) remains very loud.
01:15 to 01:35
Dense ash clouds continue to rise from the PDCs in the channel, engulfing the vegetation close to the channel margin, but in some cases quickly moving away.
01:36 to 01:42
A tree (~ 15 m tall) on the left part of the screen is violently shaken by the PDCs in the channel (similar to what happens between 1:11 and 1:14).
01:43 to 01:49
The camera momentarily moves away from the tree being impacted by the PDCs
01:50 to 01:59
The camera focuses again on the tree being violently shaken by the PDCs.
02:00 to 02:02
The tree is rapidly crushed by the PDC, appearing to be "sucked in" by the flow (probably being snapped or uprooted and leveled by the lateral impact of the PDCs. This happens so quickly that some of the leaves remain suspended in the air for a vew fractions of a second, and then slowly fall into the channel.
02:03 to 02:36
Dense ash clouds rise repeatedly from the PDCs in the channel, but appear to also be partially sucked in by the complex air circulation near to channel margin (possibly influenced by the PDCs flow and the associated convection).
02:37 to 02:39
A smaller tree (~ 10 m tall) is quickly "sucked into" the channel by the PDCs, in a similar way to the tree in 2:00 to 2:02.
02:40 to 02:47
A group of birds (parrots?) can be heard in the background, probably escaping the area.
02:48 to 03:42
Thick ash clouds keep rising from the PDCs in the channel, but the noise of vegetation and tress being crashed subsides. The circulation of the ash clouds suggests complex convection patterns near the channel.
03:43 to 07:19
This part of the video shows the broader upwards convective circulation of the ash clouds, as they rise from the PDCs in the channel.

[@FranciscoSV81]

Este es uno de los mejores vídeos que existen sobre vulcanología, suceden cosas en el mismo respecto a la interacción del flujo piroclástico con el medio, que sin bien son conocidas, jamás han sido filmadas. Hay millones de personas ahí fuera con cámara, pero nadie ha tenido este acierto.

[@Sofia-xp3cs]

Por alguna extraña razón, quisiera estar en medio de esa nube. FASCINANTE!. El mejor video que he visto aquí. 👍

[@pedrocabrera760]

Qué manera de arriesgar la vida allí. Un millón de LIKES para este héroe.

[@rippi37]

I find pyroclastic flows mesmerizing !!! I could watch them ALL day......intriguing !! Great footage...thanks

[@Kjt9653]

Look at the eruption of Fuego volcano in Guatemala in 2018. Absolutely one of my favorite pieces of footage. It's fascinating and terrifying in equal measure.

[@Steven-sh8fe]

Estoy tan traumado qué pensé que las letras de arriban decían "Este video fue subido a x*ideos..."

[@fabrica2576]

Lastimosamente el vapor que lleva es interesante , se siente a pesar de la lejanía que puede tenerle . soy de Guatemala y hoy se pasa a ser historia un fenomeno de esta altura por la gran erupción del volcán de fuego y que dejo cientos de muertos y desaparecidos.

[@-j-plum6297]

This is an awesome video. Much respect for getting a lot closer than I would. More!

[@josephastier7421]

He is standing with death. If a larger flow appears, he dies. If the wind changes direction, he dies.

[@timsexton]

This may appear like smoke from a fire or something; however, it is much more than that. It is what equates to a roiling density current. At high speeds (200+ kmh), will burn, flatten & kill nearly everything over which it passes. Respect to the videographer for shooting this footage, staying quiet & safe. *_TRUST !!_*

[@aquablack838]

Esa nube incandecente fue demasiado peligroso estar ahí pero impresionante 🤯

[@crapdice]

Can't get a sense of scale how far away is it from the camera guy? And which way is it going? Looks as if it's like 20 feet away at the beginning.

[@Goreface69]

What's happening with the shrubs and trees? They look like they're imploding @ 2:39

[@RudigerEscobarWolf]

They are being crushed and ripped by the pyroclastic flow, moving inside the channel (from left to right). As the flow hits the base, the whole tree is leveled in a fraction of a second, giving the appearance that it was sucked in by the flow!

[@marcoantonioflores4095]

They'r broken, incinered.

[@aj3682]

Although a pyroclastic flow looks like a cloud of smoke similar to what you'd see if a house or forest caught on fire, in reality it is extremely thick and full of burning hot rocks. Basically it is a hot cloud of rocks which is why you see those trees break with a violent force because its not smoke thats hitting it, its very thick and hot ash mixed in with heavy rocks.

[@josephastier7421]

The material is very dense, like rock, but flows like water and gives off gas the entire times. The gas makes it float at high speed without sound.

[@SirKolass]

@@aj3682 We are seeing mostly ash clouds however, the debris are taking the trees down from the base

[@charlesward8196]

That takes some serious cojones to stand in a drainage that has ALREADY experienced a pyroclastic flow and film the arrival of the incandescent debris flow, when an even larger surge of debris could come down the drainage with insufficient warning to safely escape.

[@SirKolass]

Incandescent debris flow? The hell is that?

[@charlesward8196]

@@SirKolass When volcanos erupt, the form of the lava varies according to the amount of silica or silicon dioxide that is incorporated into the molten mixture. When the silica content is below 47% the lava will be very fluid, like the basaltic magma that is erupting in Iceland. Increasing amounts of silica will produce dacite, andesite, and rhyolite that gets stiffer and pastier as the silica content increases. Eventually it gets to the point where it does not flow, but extrudes like toothpaste from a tube. If the magma has high concentrations of gases such as sulfur dioxide, carbon dioxide, or di-hydrogen oxide, (also know as water that will be present as super-heated steam) when the magma reaches the surface it will explode in a gassy, glassy froth of burst frozen glass bubbles (called volcanic ash) at more than 1000 degrees Celsius. The column may rise vertically from the vent at the speed of sound to a height of 7 to 10 mlles (10 - 15 Kilometers). When the ash column runs out of lift it will collapse back onto the volcanic cone and surge down valleys at speeds of up to 300 kilometers per hour at a temperature of 1000 degrees, incinerating every living thing in its path. The flow consists of several meters of a very hot dry mixture of ash and pumice with boulders up to several meters in diameter, covered by a blinding cloud of choking red hot ash.These kinds of eruptions are normally seen in volcanic arcs like the Cascades in the United States, Japan, the Andes of South America the Windward Islands of the Caribbean, the Aleutian Islands of Alaska, and the entire island chains of Java and Indonesia. Hawaii and Iceland usually have low silica basalt flows that flow slowly on the surface and can be approached on foot for collection of fresh lava samples in some cases, if proper precautions are taken. In 1991 a group of 40 journalists and scientists that had observed several smaller pyroclastic flows on Mt Unzen in Japan were, caught and killed by a later flow that was slightly larger. Maurice and Katja Krafft, two French volcanologists, and American Harry Glicken died in the event. You may think you have adequately assessed the risks to closely approach an eruption, but volcanic eruptions are very unpredictable, and can change direction and intensity with no notice. Search You Tube for “Unzen 1991”.

[@SirKolass]

@@charlesward8196 Yeah, I know what pyroclastic flows are. I'm asking you what what's a Incandescent debris flow, I've never heard this term before.

[@drixc1]

@@SirKolass A pyroclastic flow is not only made of hot ashes gases. It also carries a lot of materials , from fragments of blocks coming directly from the collapsed part of the lava dome , to anything else crossing the path of the flow and being taken away because of its power. That would explain the use of the terms "debris flow". And for incandescent well it's easy to understand that this pyroclastic flow is very hot inside: when the lava dome collapses , its lava blocks are brutally and quickly degassing as the same time as they are pulverized into ashes, this phenomenon being helped and accelerated by the steepness of the flancks of the volcano , in one word helped by gravity. That's why by night it is possible to witness red glowing parts inside pyroclastic flows (like with 2014 gunung Sinabung eruptions for example) So the person above was probably talking about these very hot lava blocks of a pyroclastic flow , moving slowly here but still collapsing fast enough to generate hot gases and pulverised material all around.....

[@SirKolass]

@@drixc1 You're confusing pyroclastic flows with pyroclastic surges. Pyroclastic flows are only ash and gas, pyroclastic surges are solid walls of debris that flatten everything on their way. The flows in Sinabung didn't glow, they were just being lit by the lava below them, pyroclastic flows don't glow.

[@philipbahia924]

that dude has alot of guts filming the pyroclastic flow up close that's too risky.

[@koribush5742]

Scared me when that tree snapped 😳

[@xaviersavedra711]

Trees getting knocked over demonstrates some power.

[@tonnyruidiazpedrozo2921]

Ésa nube con quizá más de 800 grados deja frito todo

[@SirKolass]

Holy hell, it's just swallowing trees, this must be the closest to a pyroclastic flow I've ever seen.

[@TheIvalen]

It's almost peaceful to watch.

[@RAMelloh-ij5sl]

Odd to hear birds singing, especially birds I recognize from their singing in the woods in the NE USA. It appears that the pyroclastic flow is following a dry wash down the mountain. The photographer seems to feel safe enough to stand ground on a lateral ridge, probably very familiar with the behavior of such flows on this mountain. I am wondering whether this is a stabilized telephoto shot or up close and personal. The sound track makes me think the latter.

[@bluebalute]

Up close and personal. When he rotates his shot, you can tell that he is very close. One step short of an insane place to be. Nah, that is an insane place to be. He wouldn't know until it would be to late if there were a following flow that outsized what he just watched.

[@RAMelloh-ij5sl]

@@bluebalute Making video and getting lucky. Trying to imagine what it would feel like to have that innocuous looking dust cloud slide around the ankles as one realizes one's boots are melting and one is going down. It would be instructive to scan a flow at that proximity, with an infrared thermometer, so people could understand the extreme danger.

[@bluebalute]

@@RAMelloh-ij5sl :) I doubt the infrared readings would be enough to influence some people butttttttttttttt the melting boots might do the trick.

[@josephastier7421]

You are a lot braver than I would have been.

[@yunuszainun1026]

Can it trigger lightning ?

[@josephastier7421]

Volcanic ash clouds create lightning easier than water vapor clouds. You don't see it here because this flow is very small.

[@SirKolass]

It has to be a violent eruption for lightning to happen

[@oscaraguilar8808]

Muy serca la grabación no se logra ver bien toda la nube de humo

[@rupertoahilon8035]

Wooow se mira super

[@juggis]

Wow totally unreal!

[@E3gcgamingtech4022]

Still watch this lafmo pyroplastic cloud in 2020🌚

[@aj3682]

My guess as to why the person who filmed this was so close is because he knew there was absolutely no chance of escape. If you find yourself in the path of a pyroclastic flow the best thing you can do is nothing........

[@wolfgamingreviews8236]

Que grande

[@Iambrendanjames]

Man I would be paranoid about lightning..

[@jededwardduteil4994]

That scared the shit out of me.

[@philipbahia924]

I feel bad for all the wildlife animals hope they evacuated before the pyroclastic eruption.

[@SirKolass]

Bruh this was hardly a big deal...

[@karnage8960]

That area is very desolate for the most part

[@lilianamontero230]

Dónde carajo es eso, país

[@WhatThatisIncredible]

Guatemala

[@davidxd117]

Guatemala el pasi con 34838382839382 volcanes activos a la vez

[@acmking8407]

@@davidxd117 alv