TIL: Volcanoes Sing (First Recordings Of Volcanic Thunder)

in steemstem •  last year

If anyone has been following my Bizarre Natural Phenomena Series from its very first episode, you'd remember Volcanic Lightning (you can refresh your knowledge here: Bizarre Natural Phenomena Vol.1 - Volcanic Lightning AKA Dirty Thunderstorm).

Image from: flickr.com - Author, Ajith Kumar - License, CC BY 2.0

In case you have never heard of the term before, let me explain it in short:

Volcanic lightning is referred to discharges within volcanic ash plumes. Electrification of ash particles is believed to be caused by the plume's air dynamics. As the violent, overpressurized gases are spewed out of the erupting crater, particles get charged within the growing dark plume. Short discharges start occurring and lightning lasts longer and longer as more time from the original eruption passes. Flashes of lightning have no preferred path, but most of them appear downwards [3], especially as the plume keeps transitioning through its standard phases.

Particle segregation by turbulent flow in volcanic jets promoted by the gas overpressure at the vent is responsible for the early electrification of particles and for the chaotic distribution of charges in the growing plume, which promote short discharges with tortuous paths and no preferential direction of propagation. The maximum length of lightning flashes increases with time from the onset of the explosion. Organization of charges may be achieved at later stages when the plume transitions from the jet phase to the convective phase, which possibly promotes the generation of longer, more vertical cloud‐to‐ground flashes. [2]

 Crater / Plume image Mount St. Helens (Public Domain) - Image from: commons.wikimedia.org

How did they hear it?

Up until now it was difficult to distinguish the sounds of an exploding volcano. A raging hole throwing up Hell's guts on Earth with defeaning roars did not allow human ears to discern the rumbles of the explosion from the thunder of the discharges. The circumstances were just perfect during two eruptions of Bogoslof volcano on the Aleutian Islands (Alaska); one eruption happened on 8th March and another one on 10th June, 2017 [4]

In this study researchers set up microphone arrays 60 km away from Bogolosof that picked up the sounds after the lightning strikes had occurred [1] (remember, light travels faster than sound, so the thunder would reach the microphones later). When studying the sound recordings side by side with the lightning strikes map, they managed to match the sounds with the lightning (taking into account the time delay of the sound signals compared with the flashes)

The team saw that the intensity of the sound matched that of the light and deduced that they may be able to predict the "behavior" of the plume. By studying the sounds of a dirty thunderstorm, scientists can "track" the position of the lightning within the plume. This allows them to predict the amount of ash that has been erupted and the sizes the plume can reach [4].

Why is it important?

Predicting the size of a volcanic plume is very significant for the safety of air travel. Flying through a volcanic plume is very dangerous, so being able to tell how the plume will "behave" is of critical importance.

Push the play button to hear it

The rumbling noise is the eruption and the pops and cracks are the sounds of thunder. It's not a song exactly, like I said in the title but still it is Nature's music!


References

[1] agupubs.onlinelibrary.wiley.com
[2] agupubs.onlinelibrary.wiley.com
[3] agupubs.onlinelibrary.wiley.com
[4] news.agu.org
[5] news.nationalgeographic.com
[6] popsci.com

Thank you so much for your time!

Until my next post,
Steem on and keep smiling, people!

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Such a bizarre phenomenon yet so nicely explained by science. There is a planet in the pegasus nebula which possibly have life on it, surprisingly the clouds and the rains are caused by iron vapour just like water vapours on this planet. It rains iron?!?!

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What you're saying sounds... beautiful!

That's pretty cool, a simple technique once conceived and implemented. I would be happy to never hear that sound in real life, especially living in Italy now haha.

Thanks ruth-girl :)

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Ooh yes! Some songs are better not heard in a live performance :P

Yeah..but do they fart too? Maybe @lemouth knows?!?!

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I don't know if I know...

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Volcanos do emit massive amounts of gas...

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I'm pretty sure he must have an idea about that...

Volcanoes are amazing!!! I don't think I ever want to be near one to hear it!!!

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Me neither, I prefer watching them on documentaries :P

"This allows them to predict the amount of ass that has been erupted..." Im pretty sure you might have a spelling mistake above. Gas???

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Haaaa! I just left it there to see how many will notice shhhhh!. But I guess I have to edit it :P

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Test for detecting spammers )))

Atmospheric Volcanic Metal, my favorite genre!

I was reading about them before 2 days, i didn't know about that phenomenon. Very good article!!

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Thank you! I just saw it yesterday and thought I should make a new addition to the Dirty Thunderstorm post :)

The sound is like music to my ears :p

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Hehe! All we need is some lyrics...

This is basically the Earth saying "I'm tired of you, humans." Kidding :P
Let's hope we never witness anything like this in real life! (This 'artificial' lightning storm must be spectacular though.)

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Do you think the Earth could be saying this? :P Haha!

Yeap! Let's hope our Caldera does not remember to wake up again. Watching volcanic thunderstorms on online videos are good enough :P

I have a friend geologist who was offered a position in a university to study this phenomenon, he was thinking of saying no though. Can you believe it?

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I definitely think the Earth would be saying such things! :P

Whoa! Your friend is truly blessed to have been offered such a position.

he was thinking of saying no though. Can you believe it?

So I get the impression he did accept the offer eventually? Not judging his decisions though, there are many factors to take into consideration in such cases.

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To be honest I don't know, he lives abroad and haven't spoken with him in a while...

The whole article reminds me of a series i saw.# separated movies with natural phenomena
Krakatoa Yellowstone and Superstorm...
It is what you described...in a movie
I really enjoyed this one too.Seems you got a fan

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Oooh! Thank you! I am flattered! ^_^

Whaaat! This is actually so fascinating! haha

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It's not much of a sound, but it means a lot for scientists!

Thanks for reading :)

Jeez!... This looks disastrous 🚶🚶
Never read about them till now. Good job Ruthgirl.

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It looks and it is @adetola!

Thank you for reading this! :)

Hello ruth-girl!

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