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Old 2019-05-16, 23:00   #1
kladner
 
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Default Technotronic, Volcanics, and related Geology

I have a long-running fascination with volcanoes. Recently, I have been doing a lot of reading on the subject, and collecting interesting web sites at the same time.

Just now, I was reading about Kick 'em Jenny. It is a very active submarine volcano in the Caribbean near Grenada, which puts it fairly close to chalsall's home on Barbados. This prompted me to start this thread.

https://www.google.com/maps/place/Ki...d12.3!4d-61.64

https://geology.com/volcanoes/kick-em-jenny/
In the first image, Kick 'em Jenny is #2. It is part of a group which includes Kick 'em Jack at #3. The second image shows that Kick 'em Jenny is in the area of an earlier flank collapse. The volcano which collapsed probably extended above the ocean, as the debris field extends for miles across the ocean floor. These collapses are one cause of large tsunamis.
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Old 2019-05-17, 07:36   #2
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Next time you are in Europe, go up mount Etna on the island of Sicily.
Unlike Vesuvius, which plays dead, once you are high enough you can hear Etna rumble at you every few minutes!
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Old 2019-05-18, 05:32   #3
kladner
 
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Quote:
Originally Posted by Nick View Post
Next time you are in Europe, go up mount Etna on the island of Sicily.
Unlike Vesuvius, which plays dead, once you are high enough you can hear Etna rumble at you every few minutes!
Attachment 20356
I can only hope to make such a trip someday. As long as I am hoping, I would throw in Hawaii and Iceland.
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Old 2019-05-18, 08:09   #4
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Quote:
Originally Posted by kladner View Post
I can only hope to make such a trip someday. As long as I am hoping, I would throw in Hawaii and Iceland.
Wow, that would be some trip!



As a result of volcanic activity, part of the ancient Roman spa town of Baiae is now underwater.
People dive down and see stone statues in the old streets.

Last fiddled with by Nick on 2019-05-18 at 08:11 Reason: Clarity
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Old 2019-05-18, 16:13   #5
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Baiae is associated with the Phlegraean Fields (Italian: Campi Flegrei), a volcanic complex across (and under) the Bay of Naples oops, Gulf of Pozzuoli, known for amazing amounts of inflation and deflation, or bradyseism. While the article defines this word fairly literally, that is "slow," the changes in Campi Flegrei have sometimes been large and rapid.
https://www.volcanodiscovery.com/campi-flegrei.html

Quote:
The most recent episodes of uplift ones took place from 1969-72 and 1982-84, when the inhabitants of the area, Pozzuoli in particular, were witness to and victims of a phenomenon where the earth's surface rose; within a few months it had risen by a total of 3.5 m.
EDIT above: My bad.
Another link with some good pictures:
https://www.atlasobscura.com/places/phlegraean-fields
The site above is filled with interesting, and often obscure, topics.

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Old 2019-05-20, 21:18   #6
ewmayer
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May 18th marked the date of the 1980 eruption of Mt. St. Helens. I still recall brushing a fine layer of gray ash off the family car in Ohio, roughly 2000 miles east of the eruption, 3 days later. (One of the cable channels showed the entertaining shlockfest that is Dante's Peak last Saturday evening, apparently as an anniversary homage. The scene with the spider-legged robot in the movie was filmed inside the crater left by the eruption of St. Helens.)

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Old 2019-05-21, 06:36   #7
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Quote:
I still recall brushing a fine layer of gray ash off the family car in Ohio, roughly 2000 miles east of the eruption, 3 days later.
I would recall that, too, if I had noticed. I was in Chicago then, but had no car nor television set. I was aware of the eruption, but have only recognized its intensity much more recently.
https://en.wikipedia.org/wiki/1980_e...unt_St._Helens
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Old 2019-05-25, 11:42   #8
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Mount Agung is active again: https://www.news.com.au/travel/trave...73804dfbdcfdf6
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Old 2019-05-25, 22:24   #9
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Quote:
Originally Posted by Nick View Post
https://www.volcanodiscovery.com/agung.html

That one threatens a very large nearby population. It killed more than a thousand in 1963.
Quote:
The 1963 eruption of Agung volcano
After more than 100 years of slumber, Mt. Agung came back to life on February 18, 1963. Loud noises and a cloud rising from the crater were noticed, then the ejection of bombs and blocks.
On February 24, 1963, highly viscous lava flows began to travel down the northern flank of the volcano, reaching a length of 7 km in about 18 to 20 days and an elevation of 510 m above sea level. The flows were about 0.5-0.8 km wide and 30-40 m thick. Rough estimates indicate a total volume of these flows of about 50 million cubic meters.

After that phase, the eruption became more and more explosive, and on March 17, 1963, the paroxysmal sub-Plinian eruption took place, generating a eruptino column of 8-10 km height that collapsed to form devastating pyroclastic flows. These flows reached distances of up to 15 km from the crater following vallezs to the south and east, at speeds of about 60 km/hour. Many villages were destroyed and more than 1000 people lost their lives. Heavy tephra fall occurred in areas west of the volcano, where up to 50-70 cm of ash were deposited.
In May, the south peak of the crater wall collapsed, lowering its height for about 200 meters. The lowest crater wall at present is the upper end of Langon river (2600 m).
Currently:
https://www.express.co.uk/news/world...e-Mount-Agung-
Quote:
BALI’S Mount Agung volcano is expected to erupt imminently after thousands of earthquakes were recorded, prompting more than 140,000 evacuations.

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Old 2019-05-26, 13:07   #10
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Magnitude 8 earthquake strikes Amazon jungle in Peru
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Old 2019-05-26, 14:06   #11
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When a glacier drops its stuff,
Whether granite or tuff,
That's a moraine.
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