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Krakatoa awakes

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Krakatoa awakes

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Old 24th Dec 2018, 15:55
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Originally Posted by WingNut60 View Post
Pure speculation, but in my mind I can imagine the wave being spurted through the gaps between the islands in a cone fashion, like water from a garden hose nozzle.
Someone with a good grounding in fluid dynamics might seek to differ.

Which flank of the cone slipped would, of course have a direct impact on which way the energy release was focused.
Some clever people seem to have done studies on tsunamis and flank collapse. This animation gives an potential scenario:
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Old 24th Dec 2018, 16:32
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Originally Posted by fitliker View Post
The Gods are angry , time for some sacrifices
I doubt the Gods are angry. One of them just [email protected]
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Old 24th Dec 2018, 19:10
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Not just Krakatoa either; Etna has erupted, causing closure of Catania airport.....
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Old 24th Dec 2018, 23:01
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Originally Posted by GordonR_Cape View Post
Some clever people seem to have done studies on tsunamis and flank collapse. This animation gives an potential scenario: https://twitter.com/CATnewsDE/status...36733717078016
That's great, thanks.
Like the butterfly beating its wings.
Those islands must act as reflective lenses. Then the interaction of the wave fronts (spurts) and seawater depth must all come into play.

Any idea how I could get that full screen? Just the animation.
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Old 25th Dec 2018, 01:39
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Originally Posted by WingNut60 View Post
That's great, thanks.
Like the butterfly beating its wings.
Those islands must act as reflective lenses. Then the interaction of the wave fronts (spurts) and seawater depth must all come into play.

Any idea how I could get that full screen? Just the animation.
I can't find a link for the animation, but it is clearly derived from model data provided in this 2012 scientific paper, which pretty much predicted exactly what has happened: Tsunami hazard related to a flank collapse of Anak Krakatau Volcano, Sunda Strait, Indonesia | Geological Society, London, Special Publications
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Old 25th Dec 2018, 02:09
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Thanks again. Now that is REALLY interesting.
Not entirely unexpected then.

Current reports :

........ Anak Krakatau (Child of Krakatau) was still erupting on Sunday night, belching white smoke and ash into the sky. The meteorology agency (says) that an area of about 64 hectares of the volcanic island had collapsed into the sea.“At least 373 people have died, while 128 people are currently missing,” Sutopo Purwo Nugroho, a spokesman for the disaster mitigation agency, said on Monday evening.......... It took just 24 minutes after the landslide for waves to hit land, and there was no early warning for those living on the coast
It will be interesting to see if it was the south flank that collapsed, as used in the simulation.

Last edited by WingNut60; 25th Dec 2018 at 02:27.
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Old 25th Dec 2018, 03:14
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The president of Indonesia has stated that the early warning sensor systems will be.......................................................... ..errrr.............fixed?...........we'll do something really good......for sure........

All those masses of rock poking out of the water well deserve their own names (if only for navigation purposes) and it does lessen the ever present ominous fear about what lies underneath,
but aren't they just what was left? Has it not gone at all? Is big daddy still there?
Not like it's a quiet area ring fire-wise.
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Old 27th Dec 2018, 08:12
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Seen at night, before the flank collapse, with lightning partularly after about 4:00 minutes.

And emissions at the peak seen from a drone.
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Old 27th Dec 2018, 08:25
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Better lots of of little ones than a big one......

“Krakatau had also exploded violently in 1115, opening the Sunda Strait and eradicating the isthmus that once connected the huge islands of Java and Sumatra.”
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Old 27th Dec 2018, 09:15
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Ah, now that explains why they have seemingly abandoned the building of a bridge connecting the two.
https://en.wikipedia.org/wiki/Sunda_Strait_Bridge
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Old 27th Dec 2018, 21:14
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Terrible events. Monitoring stations were vandalized for parts and not maintained in general. So tragic.
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Old 3rd Jan 2019, 11:21
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Before and after shots of the island to show the changes

https://www.bbc.co.uk/news/science-environment-46743362
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Old 10th Jan 2019, 15:54
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https://www.bbc.co.uk/news/science-environment-46825354

Here's a new view of Anak Krakatau, the collapsed Indonesian volcano that generated the 22 December tsunami that devastated local coastlines.

The picture was assembled from radar images acquired on Wednesday by the ICEYE-X2 satellite. This is a small innovative spacecraft from Finland that will soon be part of a large orbiting network of sensors.

The volcano continues to evolve, following the cone's catastrophic failure. Its original height of 340m was reduced to just 110m in the disaster, but further eruptions have since begun to re-model the remnant structure.

"This image indicates the edifice is in a building phase, with the crater no longer connected to the sea as it was in images from a week or so ago," observed Dr Andy Hopper from Leeds University, UK.



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