Volcanic explosion in Tonga

For discussion of politics, and what's going on in the world today.

Moderators: kiore, The_Metatron, Blip

Re: Volcanic explosion in Tonga

#21  Postby felltoearth » Jan 17, 2022 5:43 pm

Ha! This just popped up in my memories on FB. Joke from 9 years ago:

Did you hear the one about the Bucky Ball who was lonely so he signed up with a carbon dating service?


Sent from my iPad using Tapatalk
"Walla Walla Bonga!" — Witticism
User avatar
felltoearth
 
Posts: 14574
Age: 54

Canada (ca)
Print view this post

Re: Volcanic explosion in Tonga

#22  Postby Macdoc » Jan 17, 2022 7:25 pm

We are seeing pretty good sunrises down under.

this morning

Image
Last edited by Macdoc on Jan 17, 2022 7:43 pm, edited 1 time in total.
Travel photos > https://500px.com/macdoc/galleries
EO Wilson in On Human Nature wrote:
We are not compelled to believe in biological uniformity in order to affirm human freedom and dignity.
User avatar
Macdoc
THREAD STARTER
 
Posts: 17632
Age: 74
Male

Country: Canada/Australia
Australia (au)
Print view this post

Re: Volcanic explosion in Tonga

#23  Postby scott1328 » Jan 17, 2022 7:26 pm

felltoearth wrote:Ha! This just popped up in my memories on FB. Joke from 9 years ago:

Did you hear the one about the Bucky Ball who was lonely so he signed up with a carbon dating service?


Sent from my iPad using Tapatalk

I bet he spent half his life trying to get a date.
User avatar
scott1328
 
Name: Some call me... Tim
Posts: 8844
Male

United States (us)
Print view this post

Re: Volcanic explosion in Tonga

#24  Postby Calilasseia » Jan 17, 2022 7:41 pm

Just took a more in depth look at this.

Take a look at this satellite photo of the ash cloud. Using Google Maps to estimate the distance between the main island of Tonga and Tubou, I'm taking a figure of 200 km as the diameter of that ash cloud. So that ash cloud, when that photo was taken, was covering an area of around 31,000 square kilometres.

You're looking at an ash cloud the size of Belgium.
Signature temporarily on hold until I can find a reliable image host ...
User avatar
Calilasseia
RS Donator
 
Posts: 22229
Age: 60
Male

Country: England
United Kingdom (uk)
Print view this post

Re: Volcanic explosion in Tonga

#25  Postby Calilasseia » Jan 17, 2022 7:44 pm

UPDATE:

According to this report, the ash cloud had reached Queensland in Australia earlier today. Which means that some of that ash has now travelled around 1,500 km west.
Signature temporarily on hold until I can find a reliable image host ...
User avatar
Calilasseia
RS Donator
 
Posts: 22229
Age: 60
Male

Country: England
United Kingdom (uk)
Print view this post

Re: Volcanic explosion in Tonga

#26  Postby newolder » Jan 17, 2022 7:45 pm

Someone overlaid the early ash cloud on France for a European perspective:
Image
I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops. - Stephen J. Gould
User avatar
newolder
 
Name: Albert Ross
Posts: 7813
Age: 1
Male

Country: Feudal Estate number 9
Print view this post

Re: Volcanic explosion in Tonga

#27  Postby Macdoc » Jan 17, 2022 10:48 pm

Well no more hottest year records for a little while. :coffee:

Early data suggests the eruption was the biggest blast since Mount Pinatubo in the Philippines 30 years ago, New Zealand-based volcanologist Shane Cronin told Radio New Zealand.

https://www.cbc.ca/news/world/tonga-vol ... -1.6317364
Travel photos > https://500px.com/macdoc/galleries
EO Wilson in On Human Nature wrote:
We are not compelled to believe in biological uniformity in order to affirm human freedom and dignity.
User avatar
Macdoc
THREAD STARTER
 
Posts: 17632
Age: 74
Male

Country: Canada/Australia
Australia (au)
Print view this post

Re: Volcanic explosion in Tonga

#28  Postby newolder » Jan 18, 2022 11:39 am

Radar image from the Spacety Hisea-1 Synthetic Aperture Radar satellite and an image from before the eruption:
Image

Also, the first Copernicus, Sentinel2 image:
Image
I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops. - Stephen J. Gould
User avatar
newolder
 
Name: Albert Ross
Posts: 7813
Age: 1
Male

Country: Feudal Estate number 9
Print view this post

Re: Volcanic explosion in Tonga

#29  Postby Macdoc » Jan 18, 2022 10:20 pm

wow

Image
Travel photos > https://500px.com/macdoc/galleries
EO Wilson in On Human Nature wrote:
We are not compelled to believe in biological uniformity in order to affirm human freedom and dignity.
User avatar
Macdoc
THREAD STARTER
 
Posts: 17632
Age: 74
Male

Country: Canada/Australia
Australia (au)
Print view this post

Re: Volcanic explosion in Tonga

#30  Postby Alan C » Jan 19, 2022 3:17 am

Cripes, it was almost completely shredded. That might explain the ash cloud I suppose?
Lose it - it means go crazy, nuts, insane, bonzo, no longer in possession of one's faculties, three fries short of a happy meal, WACKO!! - Jack O'Neill
User avatar
Alan C
 
Posts: 2821
Age: 45
Male

New Zealand (nz)
Print view this post

Re: Volcanic explosion in Tonga

#31  Postby BlackBart » Jan 19, 2022 7:18 am

Alan C wrote:Cripes, it was almost completely shredded. That might explain the ash cloud I suppose?


That's usually the contents of the Magma Chamber. Imagine a Cola bottle having more Cola slowly pumped into it until the lid breaks. The Cola fizzes up in the air (and solidifies into ash in the case of the Volcano) and what's left of the lid goes with it.
You don't crucify people! Not on Good Friday! - Harold Shand
User avatar
BlackBart
 
Name: rotten bart
Posts: 12592
Age: 59
Male

United Kingdom (uk)
Print view this post

Re: Volcanic explosion in Tonga

#32  Postby Cito di Pense » Jan 19, 2022 8:17 am

BlackBart wrote:
Alan C wrote:Cripes, it was almost completely shredded. That might explain the ash cloud I suppose?


That's usually the contents of the Magma Chamber. Imagine a Cola bottle having more Cola slowly pumped into it until the lid breaks. The Cola fizzes up in the air (and solidifies into ash in the case of the Volcano) and what's left of the lid goes with it.


What's happening is that as the magma rises toward the surface, some components (water and carbon dioxide, mainly) dissolved in the magma at higher pressure (this is where the coca cola analogy best fits) begin to come out of solution and form bubbles. This alone is not enough to create the runaway process of an explosive eruption. Yes, the bottle fizzes over when the volume due to the bubbles increases enough. When the volume fraction of bubbles in the magma is sufficiently large, then the top of the column of magma begins to fragment as the pressure of gas inside the bubbles (inherited from deeper in the column) blows the top of the column apart and up out of the conduit. The removal of this mass accelerates the depressurization of the column further down and the exsolution and fragmentation front propagates rapidly downward into the magma column. This is a positive feedback catastrophe, and the eruption continues until the system re-equilibrates at a lower partial pressure of dissolved volatiles. The comparison of the explosive style with the more quiescent style of basaltic volcanoes as in Hawaii turns on the relative viscosities of the non-volatile components of magma. Bet you're glad you asked.
Хлопнут без некролога. -- Серге́й Па́влович Королёв

Translation by Elbert Hubbard: Do not take life too seriously. You're not going to get out of it alive.
User avatar
Cito di Pense
 
Name: Al Forno, LLD,LDL,PPM
Posts: 30152
Age: 24
Male

Country: Nutbush City Limits
Mongolia (mn)
Print view this post

Re: Volcanic explosion in Tonga

#33  Postby newolder » Jan 19, 2022 10:23 am

Cito's description^ gels well with a 3-D model of the volcano posted to Reddit but later deleted that shows the destroyed crater rim is but a small fraction of the whole. This static image store shows the image but the text is unreadable here and ctrl+ or cmd+ is required for zooming...
I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops. - Stephen J. Gould
User avatar
newolder
 
Name: Albert Ross
Posts: 7813
Age: 1
Male

Country: Feudal Estate number 9
Print view this post

Re: Volcanic explosion in Tonga

#34  Postby Cito di Pense » Jan 19, 2022 10:32 am

newolder wrote:Cito's description^ gels well with a 3-D model of the volcano posted to Reddit but later deleted that shows the destroyed crater rim is but a small fraction of the whole. This static image store shows the image but the text is unreadable here and ctrl+ or cmd+ is required for zooming...


That's right. As eruptions go, the best metric is cubic kilometers of volume erupted. The magma chamber volume often dwarfs the above land/sea volcanic edifice, which is usually just the accumulation of a lot of really tiny eruptions. Krakatoa and Toba were big, for sure, but the real giants are what once lay beneath the Yellowstone or Long Valley (CA) calderas.
Хлопнут без некролога. -- Серге́й Па́влович Королёв

Translation by Elbert Hubbard: Do not take life too seriously. You're not going to get out of it alive.
User avatar
Cito di Pense
 
Name: Al Forno, LLD,LDL,PPM
Posts: 30152
Age: 24
Male

Country: Nutbush City Limits
Mongolia (mn)
Print view this post

Re: Volcanic explosion in Tonga

#35  Postby felltoearth » Jan 19, 2022 5:59 pm

It appears in those images that while the top of the volcano blew there is a substantial or even expanded shelf just below the surface of the water. I would imagine an even larger island will eventually emerge.


Sent from my iPad using Tapatalk
"Walla Walla Bonga!" — Witticism
User avatar
felltoearth
 
Posts: 14574
Age: 54

Canada (ca)
Print view this post

Re: Volcanic explosion in Tonga

#36  Postby Macdoc » Jan 24, 2022 11:50 am

Bigger than I thought. 10 Megaton explosion ...

Good article

Quirks & Quarks
Tonga volcano triggered record-breaking lightning and a never-before-seen tsunami


One of the most violent explosions in the South Pacific in centuries will be studied for years



https://www.cbc.ca/radio/quirks/jan-20- ... -1.6322259
Travel photos > https://500px.com/macdoc/galleries
EO Wilson in On Human Nature wrote:
We are not compelled to believe in biological uniformity in order to affirm human freedom and dignity.
User avatar
Macdoc
THREAD STARTER
 
Posts: 17632
Age: 74
Male

Country: Canada/Australia
Australia (au)
Print view this post

Previous

Return to News, Politics & Current Affairs

Who is online

Users viewing this topic: No registered users and 1 guest