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THE Volcano Thread Pt. 2

Re: THE Volcano Thread Pt. 2

Unread postby M_B_S » Sun 08 Mar 2015, 02:32:49

Bardabunga Update : NO MEGA EXPLOSION as eruptiom ends!

http://www.livescience.com/50065-bardar ... hotos.html
Iceland's six-month-long volcanic eruption was over for less than a week when geologists clambered onto the cooling lava lake in Baugur crater to measure toxic gases there. [Read the full story.]

Baugur crater was the tallest and largest in the long chain of craters built by the spectacular fire fountains that exploded from the earth on Aug. 31, 2014, in remote central Iceland. The magma feeding the eruption comes from Bardarbunga volcano, located some 28 miles (45 kilometers) to the southwest. Here are some of the stunning views from inside Baugur crater on March 4, 2015.
***********************************

So this biggest eruption in Europe since Laki ! Will not trigger a 2nd France Revolution because famine and pestilencia will not hit Europe again...... but........it will happen again.

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Re: THE Volcano Thread Pt. 2

Unread postby Keith_McClary » Sat 04 Apr 2015, 10:20:01

List of
ALL THE WORLD’S VOLCANO WEBCAMS
Erik Klemetti, Wired.
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Re: THE Volcano Thread Pt. 2

Unread postby Keith_McClary » Fri 17 Apr 2015, 01:55:23

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Re: THE Volcano Thread Pt. 2

Unread postby dohboi » Thu 23 Apr 2015, 21:11:59

Carbonbrief.org blog post about yesterday's eruption of the Calbuco volcano:

http://www.carbonbrief.org/blog/2015/04 ... he-climate


Satellite images suggest the Calbuco ash cloud has reached at least 14km, Dr Anja Schmidt, a researcher in volcanic impacts and hazards at the University of Leeds, tells Carbon Brief. [...]

"Based on eruptions of other Chilean volcanoes [...], huge emissions of sulfur dioxide are not expected, or supported by the satellite data."

The geographical position of Calbuco may also restrict any global impact, Schmidt says:

"Global climate impacts are also unlikely due to the southern latitude of the eruption, but if the sulphur dioxide mass emission rate were to increase this eruption may temporarily enhance the aerosol particle concentrations in the upper troposphere and lower stratosphere."
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Re: THE Volcano Thread Pt. 2

Unread postby Timo » Thu 23 Apr 2015, 21:29:10

El Lago Llanquihue is actually a very beautiful place. I spent three weeks there back in 84, and looked across the lake every day to see three beautiful, majestic volcanos rising above the horizon. I wouldn't mind retiring there in just a few years, either. Real estate prices should be coming down about now, too. :roll:
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Re: THE Volcano Thread Pt. 2

Unread postby Keith_McClary » Fri 24 Apr 2015, 01:24:49

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Re: THE Volcano Thread Pt. 2

Unread postby dohboi » Fri 24 Apr 2015, 09:45:30

Thanks, that's a marvelous shot.
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Re: THE Volcano Thread Pt. 2

Unread postby Keith_McClary » Fri 24 Apr 2015, 15:08:21

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Re: THE Volcano Thread Pt. 2

Unread postby vox_mundi » Fri 04 Dec 2015, 13:56:10

Mount Etna’s stunningly violent eruption was among the strongest in decades

Image

The lava fountain reached heights of close to a mile.
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Re: THE Volcano Thread Pt. 2

Unread postby dohboi » Sun 15 May 2016, 07:38:29

http://www.sltrib.com/news/1311474-158/ ... -magnitude

Swarm of earthquakes shakes Yellowstone

The big one???...

A total of 130 earthquakes of magnitude 0.6 to 3.6 have occurred...

...The first, a magnitude 3.5, struck Sept. 13 about 17 miles northeast of West Yellowstone, Mont. Then, in the early hours Sept. 15, two quakes, a magnitude 3.2 and magnitude 3.4, were detected in quick succession at 5:10 and 5:11 a.m., about 15 miles southeast of West Yellowstone. The magnitude 3.6 that marked the peak of the swarm struck nearby about 4 1/2 hours later.

"They weren't big earthquakes," Smith said, "but they were felt."

About half a dozen earthquakes are felt in Yellowstone in an average year, he said.

"This is pretty unusual, to be honest," Smith said...
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Re: THE Volcano Thread Pt. 2

Unread postby Cid_Yama » Sun 15 May 2016, 11:05:42

Did you not note that this was from Sept 2013?
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Re: THE Volcano Thread Pt. 2

Unread postby ROCKMAN » Sun 15 May 2016, 12:14:20

dohboi - The size of those quakes isn't nearly as important as the frequency IMHO. It's what they might represent: the magma chamber getting significant shallower. The worse case scenario isn't an earthquake but a major venting event. That could destroy the economy of the country and potentially lead to millions across the globe starving.
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Re: THE Volcano Thread Pt. 2

Unread postby dohboi » Sun 15 May 2016, 13:17:38

Sorry, missed the date.

And yeah, I know it takes more than this to signal a big quake. Just wanted to keep this thread bumped and generate some discussion. Go back to your usual tasks, now! :-D
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Is Iceland's Katla Volcano Awakening?

Unread postby vox_mundi » Mon 29 Aug 2016, 12:44:31

Iceland's Katla volcano hit by unusually large earthquakes

Aug 29 (Reuters) - Two unusually large earthquakes hit one of Iceland's biggest volcanoes early on Monday, raising concerns of a possible eruption, the Icelandic Met Office said.

The Katla volcano has not erupted properly since 1918 and scientists say it is overdue to do so, although an eruption could still be decades away.

"It is quite a dynamic situation now, in the next hours and days following this, but as we speak at the moment we do not see any signs that there is an imminent hazardous unrest about to happen," Matthew Roberts, a natural hazards scientist at the Icelandic Met Office, said.

Ash from an eruption of the nearby Eyjafjallajokull volcano in 2010 shut down much of Europe's airspace for six days.

Katla, in southern Iceland, was rocked by quakes of magnitude 4.5 and 4.6 overnight. The volcano sustained similar movements in 2011. These are the largest quakes to hit Katla since 1977, when a 5.1 earthquake was measured there.

Two earthquake swarms occurred in the Katla caldera last night. The first was picked up around 1:30 am and comprised of ten earthquakes, the largest of which was magnitude 2.4. The 4.6 and 4.5 quakes were part of the second earthquake swarm which began at 1:41 am. The area has been mostly quiet since, ruv.is reports.

The volcano is covered by an ice cap, which should, in the event of an eruption, typically contain the lava for around 60 to 90 minutes, giving time to alert the population and international air traffic, Roberts said.

http://strokkur.raunvis.hi.is/~sigrun/KATLA.html

Image
1918 eruption - Katla

Reported last month ...

... The partly ice covered Katla volcanic system has been highly active in the Holocene with at least 21 eruption in the last 1100 years. The last eruption to break through the ice took place in 1918 CE.

The Katla system lies on the Eastern Volcanic Zone and is about 80 km long, consisting of a central volcano rising to 1500 m a.s.l. and an active fissure swarm extending towards northeast. The central volcano is partly covered by up to 700 m thick ice and has a 9x14 km ice-filled caldera.

The characteristic activity is explosive basaltic eruptions at the Katla central volcano with tephra volumes (bulk volume) ranging from 0.02 to over 2 km3, accompanied by glacial floods (jökulhlaups) with maximum discharge of up to 300,000 m3/sec. The largest eruptions are effusive basaltic eruptions on the fissure swarm with lava volumes ≥18 km3. Eruption frequency during the last 1100 years is 1 eruption per 50 years.

Since mid-June, earthquake activity within the caldera of the ice-covered Katla volcano has increased above background levels. More than 100 shallow-seated earthquakes have been detected in Katla caldera since 1 June 2016, which is almost four times the monthly average compared to previous years. Earthquakes occurred mainly in bursts ranging from minutes to hours, often with 20 events or more. The two largest earthquakes since the unrest began occurred on 26 July at 03:42 and 03:50 UTC, respectively, both with a magnitude of Mw3.2.
http://icelandreview.com/news/2016/07/3 ... LA-VOLCANO
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Re: THE Volcano Thread Pt. 2

Unread postby dohboi » Mon 29 Aug 2016, 23:07:49

Katla, one of Iceland's largest volcanoes, was rocked by two abnormally strong earthquakes Monday morning, raising concerns that the volcano may soon erupt.

The southern-Iceland volcano has not erupted since 1918, and scientists believe that a violent release is long overdue. From AD 930 to 1918, there were twenty large-scale eruptions documented by Katla, generally every 13–95 years.

In the early hours on Monday the area was hit by magnitude 4.5 and 4.6 quakes, similar to movements it experienced in 2011.

Interestingly, the volcano is covered by a large icecap, which would likely delay the eruption for around 60 to 90 minutes, according to Roberts. The delay could give people time to evacuate and assist air traffic control in redirecting aircraft.

The ice cap itself presents hazards, though.

“The other hazard might be a jökulhlaup, or glacial outburst flood."


http://sputniknews.com/europe/20160830/ ... uakes.html
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The Volcanic thread

Unread postby Cid_Yama » Sun 04 Dec 2016, 12:51:00

Volcanoes: Coming to New England? William Menke
Some 30 years ago, geophysicists detected a 400-kilometer-wide anomaly under parts of New England and eastern New York, where the mantle is unusually hot. It was assumed to be the remnant of a hot spot that moved on some 130 million years ago. Now, based on new seismic images and signs of helium making its way up to lake beds, Menke says the feature is an active upwelling—hot and shallow enough to create lava. Similar features may underlie other parts of the East Coast.
Friday, Dec. 16, 8 a.m.-12:20 p.m., Moscone South Posters. T51G-3012

At the AGU.
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Re: The Volcanic thread

Unread postby Plantagenet » Sun 04 Dec 2016, 16:22:57

Cid_Yama wrote:Volcanoes: Coming to New England? William Menke
Some 30 years ago, geophysicists detected a 400-kilometer-wide anomaly under parts of New England and eastern New York, where the mantle is unusually hot. It was assumed to be the remnant of a hot spot that moved on some 130 million years ago. Now, based on new seismic images and signs of helium making its way up to lake beds, Menke says the feature is an active upwelling—hot and shallow enough to create lava. Similar features may underlie other parts of the East Coast.
Friday, Dec. 16, 8 a.m.-12:20 p.m., Moscone South Posters. T51G-3012

At the AGU.


Active hot spots produce linear arrays of multiple volcanoes as crustal plates move over them due to plate tectonics. The actual hot spot itself is actually a pretty small feature---it just manifests itself as large volcanoes.

There is no line of volcanoes terminating in New England, i.e. the "thermal anomaly" under New England is mostly likely not a hot spot.

There are lots of ways to get an anomaly that don't involve hot spots. Since New England is in the middle of a place and isn't tectonically active, it probably just involves the crust being a bit thinner there so asthenosphere is a bit closer to the surface or perhaps the rocks at depth being quite thermally conductive, making it relatively hotter then most of the rest of the mid-plate region around it.

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Re: The Volcanic thread

Unread postby Tanada » Sun 04 Dec 2016, 22:15:38

Back in 2005 I visited the San Fransisco Peaks in Arizona, a bonafide National Park,
http://pubs.usgs.gov/fs/2001/fs017-01/

It seems every 450-600 years a new Volcano punches up through the bedrock of Arizona from the hot spot in the mantle underneath that location. This is also the phenomenon that formed the islands from Wake all the way down the Hawaii chain of extinct volcanoes right up to the Big Island. There is even a new deep sea vent east of the Bog Island that is current forming a submerge4d shield volcano that will eventually be above sea level as the newest island in the very long chain.

If the hot spot under New England does manage to punch a few holes and build a few volcanoes I don't expect it to be like some Hollywood movie. Much more likely it will be like Hawaii and Arizona where a few mountains form over long periods of quiet interrupted by short bursts of lava and ash eruptions that actually create new mountains.
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Re: The Volcanic thread

Unread postby rockdoc123 » Mon 05 Dec 2016, 10:54:01

There is still some debate as to whether there is an actual hot spot beneath the San Francisco volcanic field or if there was some other circumstance. Most of the research done has been to look at the petrography of the basalts with hopes of figuring out its genesis ....lot's of research and lots of paper but nothing conclusive from what I can tell. What I find interesting is the timing of volcanism in Arizona and New Mexico is somewhat similar to timing of volcanic events in southern California (Pliocene) which are believed to have formed as a response to subduction of the Mendocino triple junction. Perhaps there is some relationship.

In any event likely the Arizona risk for volcanic eruption is relatively low in comparison to Yellowstone but probably not zero.

Brumbaugh, D.S. et al, 2014. Analysis of the 2009 earthquake swarm near Sunset Crater volcano, Arizona. Jour of Volcanology and Geothermal Research, 285, pp 18-28.
Abstract
A swarm of microearthquakes occurred on October 31, 2009 within 5 km of the Sunset Crater, Arizona, volcano. A detailed study of the swarm was warranted because of its location near a young volcanic construct and its proximity to the population center of Flagstaff, Arizona. The question posed in this study was whether the swarm was the result of tectonic stress release during fault slip, or due to stresses driven by magmatic processes. This question was addressed by analyzing and comparing the physical and seismic characteristics of the swarm to the regional tectonic environment and to the characteristics of tectonic swarms in Arizona and magmatic/volcanic swarms elsewhere. This analysis included swarm duration, frequency of events, b-value, focal depths and epicentral pattern of the swarm. The comparison of the salient features of the 2009 Sunset Crater swarm to both magmatic and tectonic swarms indicates that the Sunset Crater swarm has features similar to magmatic swarms and is a potential magmatic swarm candidate.
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Re: The Volcanic thread

Unread postby sparky » Tue 06 Dec 2016, 16:50:36

.
For those interested in volcanoes , a good link
It keep a day to day watch on the world volcanoes

http://volcano.si.edu/reports_weekly.cfm

It should be noted than recent volcanic activity has been quite boring ,
no world class events has occurred for decades , just the usual barbecuing of some locals
the last one was mount Pinatubo scaled at 6
the most fun was Eyjafjallajökull at a meager 4 , but it disturbed the European air transports for days
it turned out some university idiots had set up a model of the dust cloud ,
.......as all untested models do , it turned out to be useless .
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