Originally Posted by: Gandalf The White

 

The pressure wave was detected as it passed over Auckland, with a 4mb pressure blip. That’s 1,250 miles away.

Do you think will be able to detect a pressure wave in the UK? It should be around 5pm I'd have thought.

Boom!!

https://twitter.com/Chimp_83/status/1482265201898577921?s=20

This is Santa Cruz CA a short while go:

And a second surge at the same location: https://twitter.com/TimCatteraPhoto/status/1482396514504691713 

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Edited by user 15 January 2022 17:31:23(UTC)  | Reason: Not specified

Get away from shore: US and Japan warn on tsunami - BBC News

https://www.bbc.co.uk/news/world-asia-60007119.

Originally Posted by: doctormog

My WS has just recently recorded the increased pressure reading associated with the shockwave from the eruption. Just a small but very noticeable blip. Really impressive.

What were your readings, could you maybe even post a graph?

Originally Posted by: doctormog

My WS has just recently recorded the increased pressure reading associated with the shockwave from the eruption. Just a small but very noticeable blip. Really impressive.

As I said, nothing too exciting or noteworthy unless you knew what you were looking for, but here you go. 

It’s the blip to the right. It was basically a 1hPa increase (when pressure had been falling all day and currently is) followed by a quick 2hPa drop.

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Originally Posted by: doctormog

 

As I said, nothing too exciting or noteworthy unless you knew what you were looking for, but here you go. 

It’s the blip to the right. It was basically a 1hPa increase (when pressure had been falling all day and currently is) followed by a quick 2hPa drop.

Yup, quite like that here too.

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Originally Posted by: Heavy Weather 2013

This event today really does put in perspective how powerful our planet is, and ultimately how insignificant we really are.

Absolutely fascinating day

I'm not sure they do actually - for me it's rather the opposite.

Humans move vastly more material about on this planet than the forces of geology do and the long term feed of gasses we put into the atmosphere will have much more impact than this eruption on the atmosphere. 

The way I look at it, it's a very big volcanic eruption but a blip compared to the long term effect we are having. That is what puts it into perspective for me.

Originally Posted by: Devonian

Yup, quite like that here too.

And from here as well:

https://www.wunderground.com/dashboard/pws/ILEYSDOW1/graph/2022-01-15/2022-01-15/daily

It's also interesting how the pressure had been remarkably stable up until the shockwave hit, after the main shockwave it then became more erratic on the graph. Aftershocks? A distortion caused by the wave making the high wobble, so to speak? Who knows, but it's fascinating to see!

I'd love to know what the TNT equivalents are of this.

There's only about 2 or 3 volcanoes that have had explosions so violent that pressure waves have travelled round the world.

Tambora and Krakatoa come to mind.

Krakatoa was 220 megatons equivalent and the shock wave went round the planet 4 times.

Tsar Bomba the largest nuclear weapon ever detonated. That was detonated in 1961 and it was 51 megatons equivalent and that travelled round the world twice.