Tsunami & Mega-Tsunami

Sharon Hill

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STAAAAP with the Canary Island megatsunami drama!

https://blogs.agu.org/landslideblog/2013/12/13/canary-islands-tsunami/
"To generate a very large tsunami, this slide would have to happen very fast and as an essentially coherent block. Remember that this is a landslide of 500 cubic kilometres – we do not think that very, very large landslides usually behave like this. The chances are that a collapse would occur in stages over a longer time period, which would generate a much smaller wave. Most scientists recognise that the single, intact block collapsing very fast idea is theoretically possible, but that it is the extreme end-member of a wide range of scenarios, and thus is highly unlikely."
 

Nemo

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Did a tsunami crash into Welsh coast over 400 years ago?



In what is almost certainly Britain's greatest natural disaster, over 400 years ago around 2,000 people lost their lives when a huge wave crashed thundered up the Bristol channel, drowning miles of south Wales.


But 412 years later, questions remain about whether the Welsh coast was battered by a freak tsunami, or a powerful storm surge facilitated by inadequate flood defences.


Either way, the irresistible force which caused a trail of devastating destruction around the coastline washed away buildings, destroyed hundreds livestock and even killed thousands of people.
(c) WoL '21
 

Nemo

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A tsunami in South Wales? The 1607 flood in the Bristol Channel and Severn Estuary



 

blessmycottonsocks

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Tsunami hits Tonga, following underwater eruption.

tsunami.png


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

GNC

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The time lapse image of the volcano going off is unreal. Those poor people! An unwelcome reminder of the power of a really big volcano, and there's a few of them about. Maybe we're due another Krakatoa?
 

Mythopoeika

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The time lapse image of the volcano going off is unreal. Those poor people! An unwelcome reminder of the power of a really big volcano, and there's a few of them about. Maybe we're due another Krakatoa?
Yellowstone might happen.
 

Sharon Hill

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Yellowstone might happen.
Yellowstone is very different than Hunga Tonga-Hunga Ha'apai. It's not comparable and there is no indication that Yellowstone is doing anything. Its time scale is much longer than "ring of fire" volcanoes, which blow every few centuries.
 

McAvennie

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The sight of the ash cloud dwarfing the entire islands of Tonga, the fact that internet and comms are down and very little news has come from Tonga yet, the thought of the size of the waves...

It's somewhat surprising that there does not seem to be anticipation of widespread devastation for Tonga? Kind of feels like we should be preparing for some horrendous news from the Pacific in the coming days. No?
 
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Lobeydosser

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I wonder what the effects might be on weather going forward - is it throwing enough dust up into the atmosphere to be noticeable long term ?
 
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EnolaGaia

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I wonder what the effects might be on weather going forward - is it throwing enough dust up into the atmosphere to be noticeable long term ?

According to this Live Science article - the first I've seen on prospects for weather / climate effects - the answer is 'No'. The Tonga blast pushed volcanic ash to a record (documented) altitude in the atmosphere, but the amount of ash and sulfur dioxide emitted was relatively low compared to other documented eruptions of similar scale.
Ash from Tonga volcano eruption reaches record altitude but climate cooling unlikely

The Tonga volcanic eruption was the most powerful our planet has experienced in 30 years.

The volcanic eruption that destroyed a small island in Polynesia on Saturday (Jan. 15) injected a huge amount of ash into a record altitude but won't cause any disruption to Earth's climate, experts said.

Satellites detected the ash cloud, which has already spread over Australia, at over 24 miles (39 kilometers) above Earth's surface, Oxford University research fellow Simon Proud said on Twitter on Monday (Jan. 17). This was the first time volcanic ash has been detected so high in Earth's atmosphere, he added.

"Based on analysis of data from global weather satellites, our preliminary data for the Tonga volcanic cloud suggests that it reached an altitude of 39km [24 miles]," Proud said. "We'll refine the accuracy of that in the coming days, but if correct, that's the highest cloud we've ever seen."

Scientists, however, think that the eruption won't affect Earth's climate. Despite the apocalyptic proportions of the blast, which was documented in real time by several satellites, the amount of ash it contained was relatively small compared to other cataclysmic volcanic eruptions known from previous centuries. ...

Supervolcanoes like Tonga that spurt vast quantities of sulfur dioxide into higher layers of Earth's atmosphere can sometimes produce a measurable cooling effect on the planet's climate. This effect was detected, for example, after the 1991 eruption of Mount Pinatubo in the Philippines. ... But according to available data, Tonga blasted into the atmosphere only 400,000 metric tonnes of sulfur dioxide, about 2% of the amount of Mount Pinatubo. ...
FULL STORY: https://www.livescience.com/tonga-volcano-ash-record-altitude
 
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