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General Volcanic Activity Thread!

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The PIT Maestro

The PIT

Posted
  • Location: Sheffield South Yorkshire 160M Powering the Sheffield Shield
  • Weather Preferences: Any Extreme
  • Location: Sheffield South Yorkshire 160M Powering the Sheffield Shield
Posted

Tambora vie 7

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Snowyowl9 Veteran

Snowyowl9

Posted
  • Location: Powys Mid Wales borders.
  • Location: Powys Mid Wales borders.
Posted

31 - Tsunami Stations In Event Mode....that is the most I ve seen...

7.6 or more would create the Sonic boom and tsunami. 5.8? nope...

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Midlands Ice Age Maestro

Midlands Ice Age

Posted
  • Location: Solihull, West Midlands. - 131 m asl
  • Weather Preferences: Sun, Snow and Storms
  • Location: Solihull, West Midlands. - 131 m asl
Posted
5 minutes ago, Snowyowl9 said:

31 - Tsunami Stations In Event Mode....that is the most I ve seen...

7.6 or more would create the Sonic boom and tsunami. 5.8? nope...

Are these VEI's you are talking about?

 

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SnowBear Maestro

SnowBear

Posted
  • Location: Colchester, Essex, UK (33m ASL)
  • Location: Colchester, Essex, UK (33m ASL)
Posted (edited)
6 minutes ago, Snowyowl9 said:

31 - Tsunami Stations In Event Mode....that is the most I ve seen...

7.6 or more would create the Sonic boom and tsunami. 5.8? nope...

That's EQ equivalent? Not explosive power, most of which will be atmospheric and the sonic boom will be due to air pressure. 

Edit: The bouys cannot differentiate between an EQ and an eruption, so default to EQ value. 

Edited by SnowBear
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Bullseye Community Regular

Bullseye

Posted
  • Location: Southside Glasgow (135m)
  • Weather Preferences: Beginning with S ending with W ;)
  • Location: Southside Glasgow (135m)
Posted
3 hours ago, Daniel* said:

That was before the biggest eruption. . We don’t have an up to date plot yet.

 

Very good point, thanks for that. Will be very interesting few days ahead, can see this being high end VEI 5 or even VEI 6. Worryingly, no contact at all from the island since this eruption and now majority of the island is now gone too. 

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SnowBear Maestro

SnowBear

Posted
  • Location: Colchester, Essex, UK (33m ASL)
  • Location: Colchester, Essex, UK (33m ASL)
Posted (edited)
25 minutes ago, Bullseye said:

Very good point, thanks for that. Will be very interesting few days ahead, can see this being high end VEI 5 or even VEI 6. Worryingly, no contact at all from the island since this eruption and now majority of the island is now gone too. 

The island that has practically disappeared back under the sea was uninhabited and some distance from the other islands in the Tonga Island area. 

If you look at the map below, you will see the main island called Tangatapu and the capital Nuku'alofa. Go roughly north west by about hmm, 50 miles? and thats where the volcano is at the southern end in the Ha'apai Group . 

to-01.thumb.png.a429dd6ec2966642c113990f965decd8.png

Edited by SnowBear
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matty40s Maestro

matty40s

Posted
  • Location: on a canal , probably near Northampton...
  • Weather Preferences: extremes n snow
  • Location: on a canal , probably near Northampton...
Posted

 

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Summerstorm Aficionado

Summerstorm

Posted
  • Location: Wrexham,NE Wales - 89m
  • Weather Preferences: Hot and Sunny Summers/Cold Wintry Winters
  • Location: Wrexham,NE Wales - 89m
Posted (edited)
7 hours ago, The PIT said:

Tambora vie 7

Yeah compare the two and this one in Tonga looks pale in comparison. I hate to think how bad an eruption of that scale there would be today with over double the UK's population living on nearby Java on it's own. 

Edited by Summerstorm
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The PIT Maestro

The PIT

Posted
  • Location: Sheffield South Yorkshire 160M Powering the Sheffield Shield
  • Weather Preferences: Any Extreme
  • Location: Sheffield South Yorkshire 160M Powering the Sheffield Shield
Posted
1 hour ago, Summerstorm said:

Yeah compare the two and this one in Tonga looks pale in comparison. I hate to think how bad an eruption of that scale there would be today with over double the UK's population living on nearby Java on it's own. 

Add in covid it wouldn't be good and since we depend heavily on tech the effects would be fairly major if a volcano popped that way.

Also recorded another pressure twitch 12 hours later on my Barometer.

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The PIT Maestro

The PIT

Posted
  • Location: Sheffield South Yorkshire 160M Powering the Sheffield Shield
  • Weather Preferences: Any Extreme
  • Location: Sheffield South Yorkshire 160M Powering the Sheffield Shield
Posted

Not very often you put in your weather comments shock wave from volcano picked up in the evening. Apparently heard in Alaska 6000 miles away. So biggest bang since Krakatua and Novarupta.

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jonboy Seasoned

jonboy

Posted
  • Location: York
  • Weather Preferences: Long warm summer evenings. Cold frosty sunny winter days.
  • Location: York
Posted

Imagine this occurring under one of the ice caps!!!

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BornFromTheVoid Maestro

BornFromTheVoid

Posted
  • Location: Ireland, probably South Tipperary
  • Weather Preferences: Cold, Snow, Windstorms and Thunderstorms
  • Location: Ireland, probably South Tipperary
Posted

Pressure trace from here, both the 7pm and 2am waves captured

PressureWavesEruption.thumb.jpg.214c74b66a1303fb2321111403d20cc6.jpg

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matty40s Maestro

matty40s

Posted
  • Location: on a canal , probably near Northampton...
  • Weather Preferences: extremes n snow
  • Location: on a canal , probably near Northampton...
Posted

 

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The PIT Maestro

The PIT

Posted
  • Location: Sheffield South Yorkshire 160M Powering the Sheffield Shield
  • Weather Preferences: Any Extreme
  • Location: Sheffield South Yorkshire 160M Powering the Sheffield Shield
Posted (edited)

Did anyone hear anything round those times. Overnight I heard what sounded like my side gate rattling but didn't check the time. If we wanted too I guess we could calculate how far away we are from each other.

1st and 2nd shock wave.jpg

Edited by The PIT
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SnowBear Maestro

SnowBear

Posted
  • Location: Colchester, Essex, UK (33m ASL)
  • Location: Colchester, Essex, UK (33m ASL)
Posted
4 minutes ago, BornFromTheVoid said:

Pressure trace from here, both the 7pm and 2am waves captured

PressureWavesEruption.thumb.jpg.214c74b66a1303fb2321111403d20cc6.jpg

Interesting, so as we are not directly opposite the globe to the Tonga Islands (the antipode has been calculated at Tamanrasset in southern Algeria), we can calculate that as the wave took ~7 hours longer the long way round.. Or 7 hours beyond the antipode.

Just for interest the speed of the wave was calculated quickly on the back of a fag packet to be at or slightly above the speed of sound at ~800mph. Speed of sound in air on average is 767mph which is probably what more accurate calculations would see. 

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Southern Storm Seasoned

Southern Storm

Posted
  • Location: Christchurch, Dorset
  • Weather Preferences: Extreme weather what else!
  • Location: Christchurch, Dorset
Posted (edited)
18 minutes ago, BornFromTheVoid said:

Pressure trace from here, both the 7pm and 2am waves captured

PressureWavesEruption.thumb.jpg.214c74b66a1303fb2321111403d20cc6.jpg

That's so cool to see, looking at the trace it appears there are a few smaller spikes that are equally spaced apart, are they still there when looking back before the main eruption?

If it's not the reason, any ideas what it could be? Just seems to stand out from the background noise.

Edited by Southern Storm
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SnowBear Maestro

SnowBear

Posted
  • Location: Colchester, Essex, UK (33m ASL)
  • Location: Colchester, Essex, UK (33m ASL)
Posted

Any got a link to a pressure trace at Tamanrasset, Algeria where the wave would possibly have converged and rebounded? 

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