Moderators: richierich, ua900, PanAm_DC10, hOMSaR
Thunderboltdrgn wrote:A few videos with satellite footage + regular footage + tsuanmis hitting shore (unspecified location). Looks like a very big blow.
https://www.youtube.com/watch?v=ouMTT9ikKWY
https://www.youtube.com/watch?v=yIn9ZqWG1xg
https://www.youtube.com/watch?v=Eu8V_WADjCw
Halophila wrote:I think there were a few planes in the sky within 500km or so at the time. Curious if they noticed the pressure wave
BN727227Ultra wrote:Hunga-Tonga-Hunga-Ha’apai! Preliminary interpretations of satellite data by educated hobbyists suggest it might be as big as Pinatubo in 1991. I could imagine US West Coast-AU/NZ might be affected as well as regional.
DIRECTFLT wrote:https://apnews.com/article/media-environment-and-nature-new-zealand-tonga-d434936e25079859df8261780976def8
Tonga Bat Volcano
Francoflier wrote:DIRECTFLT wrote:https://apnews.com/article/media-environment-and-nature-new-zealand-tonga-d434936e25079859df8261780976def8
Tonga Bat Volcano
Scott Manley's got a video out showing sat pictures before and afer a previous, smaller eruption that happened just before the big one, where we can see that the isthmus between the two rocky headlands had already been destroyed...
It'll be interesting to see what it looks like after the dust (ash) settles, and I'm guessing it will look nothing like before. The power of these events is unimaginable.
https://www.youtube.com/watch?v=zoMRwyNhqJ4
Tokyo/Wellington – Japan's Pacific coast was hit early Sunday by tsunami waves following a massive underwater volcanic eruption in the South Pacific the previous day, prompting the weather agency to issue tsunami warnings and advisories. Nearly 230,000 residents were urged to move to high ground.
The Meteorological Agency at one point early Sunday issued a tsunami warning for the northeastern prefecture of Iwate and the southwestern islands of Amami and Tokara in Kagoshima Prefecture, predicting waves as high as 3 meters, but later downgraded the warnings to advisories.
All the advisories were revoked by 2 p.m. Sunday.
A 1.2-meter tsunami was observed in the city of Amami shortly before midnight Saturday, while a 1.1-meter tsunami arrived in Kuji, Iwate, at 2:26 a.m. Sunday.
According to the agency, a small tsunami of less than 1 meter was observed across a wide area of the country's Pacific coast, from Hokkaido to Kyushu and Okinawa.
There were no immediate reports of injuries.
Info from David Fee, @Alaska_AVO
coordinating scientist re #Tonga volcano eruption: A part of the pressure signal in Alaska was in the audible range. The very large signal is not
that surprising considering the scale of the eruption, but the audible aspect is fairly unique.
MohawkWeekend wrote:Wonder if the Chinese airfields they just built on sandbars are underwater?
Aaron747 wrote:MohawkWeekend wrote:Wonder if the Chinese airfields they just built on sandbars are underwater?
That would seem unlikely with the Philippines and Indonesia in the way.
T4thH wrote:As we have had a tsunami, the magma chamber has collapsed again. So pretty sure, there is no middle island any more, will be intersting to see, if the both outer edge islands are still there or also gone now/are now part of the new formed calderra structure. Just remind, the whole vulcano is part of a calderra.
Aaron747 wrote:Have been interested in volcanoes since childhood. For an event this size with a summit/crater collapse I’m always a little confused: does the explosion trigger the collapse or other way around? I suppose it could go either way. And regardless a tsunami will be triggered by debris moving swiftly underwater.
In any case should be a dramatic next few days with more Surtseyan blasts.
Aaron747 wrote:Have been interested in volcanoes since childhood. For an event this size with a summit/crater collapse I’m always a little confused: does the explosion trigger the collapse or other way around? I suppose it could go either way. And regardless a tsunami will be triggered by debris moving swiftly underwater.
In any case should be a dramatic next few days with more Surtseyan blasts.
Noray wrote:T4thH wrote:As we have had a tsunami, the magma chamber has collapsed again. So pretty sure, there is no middle island any more, will be intersting to see, if the both outer edge islands are still there or also gone now/are now part of the new formed calderra structure. Just remind, the whole vulcano is part of a calderra.
A radar image captured by Sentinel-1 is already available.
https://twitter.com/CopernicusEU/status ... 9038394370
Outer edge islands much smaller than before, nothing but water inbetween.
“The tsunami hit around 5.30pm local time, I believe,” said Eleini. “Angela and her husband, James, got washed away. James was able to cling on to a
tree for quite a long time, but Angela was unable to do so and was washed away with the dogs, I think four or five dogs.
Two people have drowned off a beach in northern Peru, local authorities say, after unusually high waves were recorded in several coastal
areas following Saturday’s eruption of an underwater volcano in Tonga.
The deaths occurred on Saturday on a beach located in the Lambayeque region, Peru’s National Institute of Civil Defence (Indeci) said in a statement.
StarAC17 wrote:It is theorized that the super calderas (Toba, Yellowstone, Lake Taupo) were formed because the surrounding rocks collapsed into the void.
I say most eruptions because if you look at Mt. St Helens. The Northern flank was blown off from a landslide and it was a horizontal blast
SkyVoice wrote:If one wants to geek out on this and other eruptions, then the Volcano Cafe website is the place for you. Some of the posts are quite technical, but there is so much to read and to see that is just plain fascinating. The hundreds of videos and pics posted there from YouTube, Twitter, private posts, etc. are great, and the comments section contains posts that follow the events in real time. Here is a link to the latest activity from Hunga Tonga . . .
https://www.volcanocafe.org/the-vei-5-m ... nga-tonga/
SkyVoice wrote:If one wants to geek out on this and other eruptions, then the Volcano Cafe website is the place for you. Some of the posts are quite technical, but there is so much to read and to see that is just plain fascinating. The hundreds of videos and pics posted there from YouTube, Twitter, private posts, etc. are great, and the comments section contains posts that follow the events in real time. Here is a link to the latest activity from Hunga Tonga . . .
https://www.volcanocafe.org/the-vei-5-m ... nga-tonga/
Tugger wrote:OK, odd question but which aircraft are best able to fly in heavy ash conditions?
Tugg
Tugger wrote:OK, odd question but which aircraft are best able to fly in heavy ash conditions?
Tugg
DIRECTFLT wrote:Tugger wrote:OK, odd question but which aircraft are best able to fly in heavy ash conditions?
Tugg
Maybe Hot Air Balloons
Aaron747 wrote:DIRECTFLT wrote:Tugger wrote:OK, odd question but which aircraft are best able to fly in heavy ash conditions?
Tugg
Maybe Hot Air Balloons
Actually melted ash might clog the flame emitter Not to mention ash frozen to the balloon exterior would significantly add to the weight of the vehicle.
Tugger wrote:OK, odd question but which aircraft are best able to fly in heavy ash conditions?
Tugg
DIRECTFLT wrote:SkyVoice wrote:If one wants to geek out on this and other eruptions, then the Volcano Cafe website is the place for you. Some of the posts are quite technical, but there is so much to read and to see that is just plain fascinating. The hundreds of videos and pics posted there from YouTube, Twitter, private posts, etc. are great, and the comments section contains posts that follow the events in real time. Here is a link to the latest activity from Hunga Tonga . . .
https://www.volcanocafe.org/the-vei-5-m ... nga-tonga/
That's Excellent !! Thanks for the link.
Tonga calls for 'immediate aid' as another large eruption detected
https://www.youtube.com/watch?v=DzDN-1Z9vqM
Yikes! wrote:Tugger wrote:OK, odd question but which aircraft are best able to fly in heavy ash conditions?
Tugg
None. Especially turbine powered aircraft.
Aaron747 wrote:DIRECTFLT wrote:Tugger wrote:OK, odd question but which aircraft are best able to fly in heavy ash conditions?
Tugg
Maybe Hot Air Balloons
Actually melted ash might clog the flame emitter Not to mention ash frozen to the balloon exterior would significantly add to the weight of the vehicle.
Tugger wrote:Thanks all. I realize the weirdness of the question. I know planes don't like ash, more importantly any engine really!
Wasn't sure if some brainchild had come up with a filter system that could work.
(I can only think of a rotating one that blocks it as it comes in then continuously rotates so that is blown off and clear filter space is presented. But I get the impossibly/difficulty of that being made to work.)
Tugg
StarAC17 wrote:Tugger wrote:Thanks all. I realize the weirdness of the question. I know planes don't like ash, more importantly any engine really!
Wasn't sure if some brainchild had come up with a filter system that could work.
(I can only think of a rotating one that blocks it as it comes in then continuously rotates so that is blown off and clear filter space is presented. But I get the impossibly/difficulty of that being made to work.)
Tugg
The issue with volcanic ash is that its both incredibly fine as a particle but also very abrasive as it is rock at its most microscopic level. Its essentially vaporized glass and I don't know how effective any filtration would work that would be beneficial to an jet engine in normal operations. You would need a HEPA filter to essentially filter out the stuff. Wouldn't make sense considering that satellites know exactly where the Ash is. Thankfully most volcanoes are out of frequently traveled air routes. Iceland is in a particularly bad spot for the North Atlantic routes.
If you go back to BA 009, the leading edges of the 747 were sandblasted because it is an abrasive material. Also the melting point of Ash is around lower than the combustion chamber of a jet and it causes all kinds of chaos.
ssteve wrote:BN727227Ultra wrote:Hunga-Tonga-Hunga-Ha’apai! Preliminary interpretations of satellite data by educated hobbyists suggest it might be as big as Pinatubo in 1991. I could imagine US West Coast-AU/NZ might be affected as well as regional.
Potentially two years of cooler temperatures if it's Pinatubo sized.