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THE Volcano Thread Pt. 2

Re: THE Volcano Thread Pt. 2

Unread postby dohboi » Sat 05 May 2018, 09:36:26

See the massive sinkhole — six stories deep, two football fields long — that opened underneath a New Zealand farm. A volcanologist says it may have been growing underground for up to 100 years before recent heavy rain opened it up.

https://cbsloc.al/2Idx4Tu
https://twitter.com/CBSLA/status/992496999458099200

(I'm pretty sure Saruman had something to do with this one! :) )
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Re: THE Volcano Thread Pt. 2

Unread postby Plantagenet » Sat 05 May 2018, 17:29:59

dohboi wrote:And now...Alaska:

https://www.cnn.com/2018/05/05/us/alask ... index.html

I wasn't even aware that Alaska had volcanoes!


On average about one eruption per year occurs at one or other of the Aleutian Island Volcanoes. Mt. Cleveland is among the most active, but the island its on is uninhabited.

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If a volcano erupts on an island that is so remote that no one hears it, does it make a sound?

Cheers!
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Re: THE Volcano Thread Pt. 2

Unread postby dohboi » Sun 06 May 2018, 15:57:55

Thanks, P. And...no (but it does make noise! :) )

Meanwhile, further south:

Lava Flows and Sulfur Dioxide Threaten Leilani Estates on Kilauea


The new eruption far on the East Rift zone of Kilauea is continuing. The latest count has at least 10 fissure vents erupting ... on the east side of Leilani Estates and more cracks in the ground, some releasing copious sulfur dioxide gas.

The lava flows coming from the fissures vents that are intermittently erupting has destroyed at least 5 homes so far with more being threatened and has overrun a number of roads. The lava fountains from the active fissure vents have reached as high 70 meters (215 feet) — you can watch some of the impressive footage of the eruption below. All of the Leilani Estates subdivision has been evacuated with little idea when residents might be permitted back into their homes.

In some of the most stunning video, you can see a fissure erupting in the middle of an area of homes. These vents could be active for weeks-to-months, so many of these homes could be inundated with lava. This part of Hawaii is by no means wealthy, so the stakes are high for the people who live in Leilani Estates — many of which may not be able to just “pick up and leave”.

However, it is the sulfur dioxide gas that is the real danger to people, as the concentrations being emitted are high enough to kill someone — the sulfur dioxide combines with water in your lungs and throat to form sulfuric acid! The sulfur dioxide plume has been mapped from the Suomi-NPP satellite, spreading to the southwest of the eruption...


http://blogs.discovermagazine.com/rocky ... n-kilauea/
Maps and video at the link.
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Re: THE Volcano Thread Pt. 2

Unread postby ROCKMAN » Mon 07 May 2018, 09:58:38

Some interesting facts: Kīlauea's eruptive history has been a long and active one; its name means "spewing" or "much spreading" in the Hawaiian language, referring to its frequent outpouring of lava. Lavas younger than 1,000 years cover 90 percent of the island's surface. Not unreasonable to expect every structure to be destroyed in some X hundred years. The elevation above sea level of the island doesn’t look that significant but: "It is the TALLEST mountain on earth. Measured from its base on the ocean floor, it rises over 33,000 ft, significantly greater than the elevation of Mount Everest above sea level. Amazing given it began growing only 350,000 to 400,000 years ago.
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Re: THE Volcano Thread Pt. 2

Unread postby dohboi » Sun 03 Jun 2018, 23:26:54

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Re: THE Volcano Thread Pt. 2

Unread postby ROCKMAN » Tue 05 Jun 2018, 11:22:15

baha - Interesting catch...thanks. Such variations in the Yellowstone magma chamber have been monitored for years. But volcanic activity is not related to activity in the earth's core. From

https://blogs.agu.org/martianchronicles ... -come-fro/

"Lava: Where does it come from?

Well, volcanoes. And the lava in volcanoes comes from deep in the earth where everything is molten, right? Wrong! It’s true that as you go deeper into the earth, things heat up, but the earth isn’t a crispy rock shell around a gooey molten center. The crust, mantle and inner core of the earth are all solid rock (or iron in the case of the core). The only large portion of the earth’s interior that is liquid is the outer core, and lava does not come from there (again, if it did, it would be molten iron)."

Volcanos, as well as hot spots that generate geysers, are very shallow and cover a very limited area compared to the entire globe. As such activity in Yellowstone, Hawaii, Guatemala, Iceland et al are not related.
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Re: THE Volcano Thread Pt. 2

Unread postby Revi » Tue 05 Jun 2018, 13:01:30

I used to live on the slope of the next volcano over, Volcan de Agua. I was up above Ciudad Vieja above Antigua. It was about 5 miles from Volcan de Agua. There were earthquakes all the time and Volcan de Fuego would smoke as I recall.

It's been erupting a lot lately. The two volcanoes were the reason they moved the capital down to Guatemala City.

I hope Antigua is okay. It's right beneath both volcanoes!
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Re: THE Volcano Thread Pt. 2

Unread postby rockdoc123 » Tue 05 Jun 2018, 15:22:18

Well, volcanoes. And the lava in volcanoes comes from deep in the earth where everything is molten, right? Wrong! It’s true that as you go deeper into the earth, things heat up, but the earth isn’t a crispy rock shell around a gooey molten center. The crust, mantle and inner core of the earth are all solid rock (or iron in the case of the core). The only large portion of the earth’s interior that is liquid is the outer core, and lava does not come from there (again, if it did, it would be molten iron)."

Volcanos, as well as hot spots that generate geysers, are very shallow and cover a very limited area compared to the entire globe. As such activity in Yellowstone, Hawaii, Guatemala, Iceland et al are not related.


well it depends on what you mean by "liquid". If you use it in the context of liquid as in a glass of water or liquid in the context of physical properties where for all intents and purposes a material behaves as a newtonian fluid. In the latter case the upper asthenosphere behaves in this manner, most of the rock material is in a molten form and behaves as a newtonian fluid. And what is "shallow" is also a matter of perspective. The upper asthenosphere where the Yellowstone hot spot originates is at a depth of around 30 km, which would be shallow in the context of the depth to the inner mantle but in itself is pretty deep. Yellowstone and Kiluea are both hotspot related whereas many of the others are related to rising partical melt back arc of subduction zones. To some extent back arc basin volcanoes located along the same plate margin can be related as they are partly due to speed of plate spread and hence subduction. In the distant past there does seem to be some relationship between the speed of plate accretion (measured by spacing of magnetic stripes on the sea floor) and periods of greater volcanic activity. Still not well understood.
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Re: THE Volcano Thread Pt. 2

Unread postby dohboi » Mon 18 Jun 2018, 14:04:35

Not really a volcano, or even an earthquake...but...wow!!


"Mexico’s Institute of Geological and Atmospheric Research reported an increase in seismic activity at exactly the moment Lozano scored in the 35th minute of the game against reigning champions Germany – sparking mass celebrations..."

https://www.rt.com/sport/430033-world-c ... arthquake/

also at BBC Sport: https://www.bbc.com/sport/football/44513006
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Re: THE Volcano Thread Pt. 2

Unread postby ROCKMAN » Tue 19 Jun 2018, 09:52:20

Revi - Same problem we have here with folks building in active flood plains. Cheaper land just like the areas at the base of volcanic slopes. A good plan...until it isn't.
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Re: THE Volcano Thread Pt. 2

Unread postby dohboi » Sun 23 Dec 2018, 13:19:59

Krakatoa Volcano (Sunda Strait, Indonesia): Possible Major Eruption With Ash to 55,000 ft Following Deadly Tsunami

https://www.volcanodiscovery.com/krakat ... deadl.html

(Don't worry, though, I'm pretty sure Krakatoa has never had any major eruptions... :-D 8O :| )
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Re: THE Volcano Thread Pt. 2

Unread postby dohboi » Sun 09 Jun 2019, 23:41:43

Mount Sinabung erupts in western Indonesia...

A column of thick ash was spewed 7km high into the sky from the crater of Mount Sinabung volcano on Sumatra Island of western Indonesia on Sunday (June 9), the country's national volcanology agency said.

The volcano began belching ash and smoke at 4.28pm Jakarta time, followed by a spread of hot ash to the southeast and south of the crater by up to 3.5km and 3km respectively, the agency said in a statement...


https://www.straitstimes.com/asia/se-as ... s-reported
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Re: THE Volcano Thread Pt. 2

Unread postby Revi » Mon 10 Jun 2019, 09:57:11

dohboi wrote:Mount Sinabung erupts in western Indonesia...

A column of thick ash was spewed 7km high into the sky from the crater of Mount Sinabung volcano on Sumatra Island of western Indonesia on Sunday (June 9), the country's national volcanology agency said.

The volcano began belching ash and smoke at 4.28pm Jakarta time, followed by a spread of hot ash to the southeast and south of the crater by up to 3.5km and 3km respectively, the agency said in a statement...


https://www.straitstimes.com/asia/se-as ... s-reported


We could use the cooling effect from a volcanic eruption! Pinatubo cooled us off for a little while. Maybe we'll cool for a few years. It has to be a big one, however...
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