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A volcanic growth spurt; Bolivian volcano Uturuncu is fertile ground for research, study and fascination | | The Bulletin

A volcanic growth spurt; Bolivian volcano Uturuncu is fertile ground for research, study and fascination | | The Bulletin | Autour des volcans | Scoop.it
UTURUNCU VOLCANO, Bolivia — The broad hill at the base of Uturuncu is unassuming. Its gentle arc fades naturally into the Andean landscape.But the 43-mile-long stretch of rocky soil is now an object of international scientific fascination.Satellite measurements show that the hill has been rising more than half an inch a year for almost 20 years, suggesting that the volcano, which last erupted more than 300,000 years ago, is steadily inflating.

“The size and longevity of the uplift is unprecedented,” said Shanaka de Silva, a geologist at Oregon State University who has been studying Uturuncu since 2006.

Taken together with other new research, he continued, the inflation means “we could be witnessing the development of a new supervolcano.”

Such a volcano could produce an eruption of ash, rock and pumice 1,000 times the strength of the 1980 eruption of Mount St. Helens in Washington state, the worst volcanic event in modern American history, and 10,000 times that of the Icelandic eruptions in 2010 that paralyzed global air traffic for weeks.

Luckily, while the planet has 30 to 40 supervolcanoes — 10 of them potentially active — supereruptions occur only every 100,000 years or so. The last one, that of the Toba Volcano in Sumatra about 74,000 years ago, is thought to have spewed enough ash to cause a 6- to 10-year “volcanic winter,” a 1,000-year global cooling period and a loss of life so vast that it may have changed the course of human evolution.

“We see no evidence for an imminent supervolcanic eruption anywhere on Earth,” said Jacob Lowenstern, a research geologist and geochemist with the United States Geological Survey, who specializes in one of the best-known of the world’s supervolcanoes — Yellowstone, in Wyoming.

About Uturuncu, he said that while “its rise over 20 years is certainly significant,” there wasn’t enough evidence to call it a supervolcano in the making.

Other researchers agree. But they say Uturuncu’s steady inflation makes it fertile ground for study.

“It’s like a tumor growing within the earth,” de Silva said, “and we have to understand whether it is benign or malignant.”

In 2009, with funds from the United States’ National Science Foundation, an international team of seismologists, geologists, geophysicists and other experts and students formed a project called Plutons to study Uturuncu and Lazufre, a volcano on the border of Chile and Argentina. (The project’s name is an acronym for the volcanoes and the researchers’ institutions.)

Uturuncu was already considered potentially active. Eighteen thousand feet up its slopes (it peaks at 19,711 feet above sea level), small holes in the ground called fumaroles leak scorching sulfur gases. These may date 10,000 years and are evidence of a heat source close to the surface.

Also telling is the white soil near the summit (from a distance it looks deceptively like snow) that results from thermal changes below.

Martyn Unsworth, a geophysicist at the University of Alberta in Canada and a member of the Plutons team, studied data from 20 days of fieldwork in November using magnetotellurics, a remote radio-wave-sensing method similar to CT scanning in the human body. The findings suggested a zone of low electrical resistance far below the surface “that is likely a magma chamber,” he said.

University of Alaska geophysicists note a region where sound waves travel more slowly than normal, a characteristic of partly molten rock. And Noah Finnegan, a geomorphologist at the University of California, Santa Cruz, has concluded that the magma chamber is growing by one cubic meter (35 cubic feet) per second, though its total volume is not known.

Uturuncu is nestled in one of the planet’s largest supervolcanic regions, which has six supervolcanoes across Bolivia, Chile and Argentina. Though it was long thought to be separate from those supervolcanoes, new Plutons findings reveal that magma from Uturuncu’s last eruption is more similar to the supervolcanoes’ than to that of the region’s more common volcanoes.

For Mayel Sunagua, a Bolivian government geologist and member of the Plutons team, this is an exciting time — “the first broad international effort dedicated to investigating our volcanoes.” Bolivia has 198 recognized volcanoes; 18 are considered potentially active. The country’s last volcanic eruption was 10,000 years ago.

The flurry of activity here does lead some to wonder: Why focus on a potential hazard perhaps tens of thousands of years away, when other volcanic dangers are much more imminent?

“I ask myself that same question,” Unsworth acknowledged. But he added that the research would broaden scientists’ knowledge about volcanoes in general.

De Silva agrees. With its odd bulge and its other unusual signals, Uturuncu has an appealing air of mystery, he said — and besides, “it’s kind of fun.”
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Autour des volcans
Veille volcanique.Suivi de l'actualité des volcans et tout ce qui s'y rapporte à travers le monde.
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Autour des volcans | Facebook

Autour des volcans | Facebook | Autour des volcans | Scoop.it

Bienvenue sur "autour des volcans" un topic de veille volcanique.


Je vous propose d'y suivre l'actualité des volcans et tout ce qui s'y rapporte à travers le monde.Vous y trouverez un grand nombre de liens vers les différents observatoires,les webcams et les analyses des meilleurs spécialistes en la matière.

 

N'hésitez pas à nous rejoindre et à partager vos articles(en français et en anglais.)

N'oubliez pas aussi d'utiliser les "tags" pour une meilleure navigation.

 

Retrouvez nous également sur notre page facebook que vous pouvez atteindre en cliquant sur la magnifique photo du Puyehue-cordon caulle en pleine action:)

Et aussi sur twitter:https://twitter.com/#!/AVolcans

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Bolivie : le Salar de Coipasa et le Tata Sabaya.

Bolivie : le Salar de Coipasa et le Tata Sabaya. | Autour des volcans | Scoop.it
Une photo satellite de la Nasa nous ramène vers l’ouest de la Bolivie, et le…...
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Volcano Notification Service from USGS | Geology.com

Volcano Notification Service from USGS | Geology.com | Autour des volcans | Scoop.it
News about geology and earth science from around the world!
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The Other Side of the Canary Islands | The Pendulum

The Other Side of the Canary Islands | The Pendulum | Autour des volcans | Scoop.it
CANARY ISLANDS — When you think of the Canary Islands, what comes to mind? Before visiting, I thought of a tropical environment with beautiful beaches and clear waters. I cannot ...
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Eruption Update for October 9, 2012: Lokon in Indonesia, Costa Rican Volcanoes and Drilling at Newberry | Wired Science | Wired.com

Eruption Update for October 9, 2012: Lokon in Indonesia, Costa Rican Volcanoes and Drilling at Newberry | Wired Science | Wired.com | Autour des volcans | Scoop.it
The eruption of Lokon-Empung in Indonesia on October 7, 2012.
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Stuff-Earth's carbon cycle natural thermostat

The Gaia Hypothesis was proposed by James Lovelock in 1969 and states that all living matter on Earth (called the biosphere) functions as a single organism which Lovelock called Gaia after the Greek goddess of the Earth.

It is controversial because the hypothesis goes on to state that this organism, the biosphere of Earth, actively self-regulates the temperature and chemistry in the atmosphere to produce the conditions suited to supporting life. An example is the weathering cycle which operates as follows.

When volcanoes erupt, carbon dioxide is blasted into the

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Odd Maar Volcano Explosions Explained: Big Pic : Discovery News

Odd Maar Volcano Explosions Explained: Big Pic : Discovery News | Autour des volcans | Scoop.it
The eruption of a so-called maar-diatreme volcano is short-lived but violent.
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Serendipity: finding volcanic accounts in unexpected places

Serendipity: finding volcanic accounts in unexpected places | Autour des volcans | Scoop.it
The lovely word ‘serendipity’ means finding something good or useful while not specifically searching for it.This article pulls together the posts I made in August about an eruption near Medina in ...
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Volcanic activity world-wide 5 October 2012: Etna, Iceland, Popocatépetl, Fuego, Santiaguito, Sheveluch, Sakurajima, Pagan

Volcanic activity world-wide 5 October 2012: Etna, Iceland, Popocatépetl, Fuego, Santiaguito, Sheveluch, Sakurajima, Pagan | Autour des volcans | Scoop.it
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Activité volcanique de la semaine.

Activité volcanique de la semaine. | Autour des volcans | Scoop.it
Etna : Depuis le 2 octobre au soir, les webcams laisse voir une incandescence…...

 

English=>http://earth-of-fire.over-blog.com/pages/Volcanic_activity_of_the_week--8344878.html

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PLOS ONE: Episodic Eruptions of Volcanic Ash Trigger a Reversible Cascade of Nuisance Species Outbreaks in Pristine Coral Habitats

PLOS ONE: Episodic Eruptions of Volcanic Ash Trigger a Reversible Cascade of Nuisance Species Outbreaks in Pristine Coral Habitats | Autour des volcans | Scoop.it
PLOS ONE: an inclusive, peer-reviewed, open-access resource from the PUBLIC LIBRARY OF SCIENCE. Reports of well-performed scientific studies from all disciplines freely available to the whole world.
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Extreme Survival: Volcano Eruption

Extreme Survival: Volcano Eruption | Autour des volcans | Scoop.it
We’ve spoken to experts and gotten the low-down on how to survive some of the most extreme scenarios on planet earth. Read on and thank us later.
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Volcanic activity world-wide 4 October 2012: El Hierro, Kilauea, Popocatépetl, Fuego, Santiaguito, Nevado del Ruiz, Sheveluch

Volcanic activity world-wide 4 October 2012: El Hierro, Kilauea, Popocatépetl, Fuego, Santiaguito, Nevado del Ruiz, Sheveluch | Autour des volcans | Scoop.it
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Topic en pause!

Bonjour,

 

"Autour des volcans" s'accorde quelques semaines de repos.Voici quelques liens pour continuer à suivre l'actualité volcanique au jour le jour:

 

-http://www.activolcans.info/FichePageNews.php

 

-http://earth-of-fire.over-blog.com/

 

-http://volcans.blogs-de-voyage.fr/

 

-http://trap.it/#!traps/id/e4e03aa0-beef-4216-b937-2a304adec440

 

-https://www.google.com/news/section?cf=all&ned=uk&hl=en&q=volcano%20%20eruption%20OR%20lava%20OR%20ash%20-VOLC%20-blog%20-corp&edchanged=1&authuser=0

 

-https://volcanocafe.wordpress.com/2011/11/15/volcano-cafe/

 

-http://www.wired.com/wiredscience/eruptions/

 

-https://www.facebook.com/groups/abc.volcanoes/

 

 

Un grand merci à tous les lecteurs du topic et à très bientôt:-)

 

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Volcanic activity world-wide 9 October 2012: Kilauea, Fuego, Santiaguito, San Miguel, Machin, Bagana, Manam, Nyiragongo, El Hierro, Sakurajima

Volcanic activity world-wide 9 October 2012: Kilauea, Fuego, Santiaguito, San Miguel, Machin, Bagana, Manam, Nyiragongo, El Hierro, Sakurajima | Autour des volcans | Scoop.it
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Activité volcanique du week-end.

Activité volcanique du week-end. | Autour des volcans | Scoop.it
Selon le KVERT et le VAAC Tokyo, le Shiveluch a été marqué depuis le 5 octobre…...

 

English=>http://earth-of-fire.over-blog.com/pages/volcanic-activity-of-the-week-end--8352659.html

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Ash Plume from Shiveluch : Natural Hazards

Ash Plume from Shiveluch : Natural Hazards | Autour des volcans | Scoop.it
Acquired a little less than two hours apart, these images show a volcano before and after it spewed an ash plume on October 6, 2012.
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Indonesian volcano spews ash clouds in new eruption - Intellasia East Asia News

Indonesian volcano spews ash clouds in new eruption - Intellasia East Asia News | Autour des volcans | Scoop.it

One of Indonesia’s most active volcanoes has erupted again, spewing clouds of ash, an official said Monday.

The 1,580-metre (5,214-feet) Mount Lokon on northeast Sulawesi island erupted at 2pm (0700 GMT) on Sunday with thunderous sounds heard as far as five kilometres (three miles) away.

“Lokon has been quite active the past few months. This was the seventh biggest eruption since mid-September,” government vulcanologist Farid Bina told AFP from the volcano’s monitoring post in North Sulawesi province.

“It produced a loud sound like thunder. But we cannot detect the height of the eruption as thick clouds covered its peak,” he said, adding that muddy rains fell in surrounding areas.

(...)

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Développement géothermal et subsidence de rift zone …

Développement géothermal et subsidence de rift zone … | Autour des volcans | Scoop.it
L’USGS a comparé diverses zones volcaniques où il y avait exploitation…...

 

English=>http://earth-of-fire.over-blog.com/pages/geothermal-development-and-subsidence-of-a-rift-zone--8350492.html

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Google Earth A to Z: Volcanoes

Google Earth A to Z: Volcanoes | Autour des volcans | Scoop.it
Amazing things about Google Earth - news, features, tips, technology, and applications...
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Bonnie Bracey Sutton's comment, March 19, 2013 11:27 AM
Since the very first day that Google Earth was released, volcanoes have been amazing to view while browsing around. While Google has added some great features in the last seven years (textured 3D buildings, Street View imagery, etc), mountains and volcanoes simply need 3D terrain and high quality satellite imagery, which Google Earth has always had.

The result is that volcanoes can be some of the most amazing things to view in Google Earth.
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HVO Scientists Say Geothermal Plant Won’t Cause Ground Sinking

HVO Scientists Say Geothermal Plant Won’t Cause Ground Sinking | Autour des volcans | Scoop.it
Submitted by Jim Kauahikaua from Hawaiian Volcanoes Observatory: Recently, Hawaiian Volcano Observatory scientists have been asked if Hawaii Island’s geothermal development causes subsidence of the ground surface, as has been observed at U.S.
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Etna (Sicile / Italie)

La presse italienne confirme la reprise d’activité dans la Bocca Nuova. L’édition palermitaine de La Repubblica indique que « l’Etna a repris...
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Dave Crockett’s Narrow Escape | Rosetta Stones, Scientific American Blog Network

Dave Crockett’s Narrow Escape | Rosetta Stones, Scientific American Blog Network | Autour des volcans | Scoop.it

Rosetta Stones

Adventures in the good science of rock-breaking.

 

One of the eeriest things I’ve ever seen is the video shot by KOMO News reporter Dave Crockett on May 18th, 1980. He was just 28 years old. Something woke him before dawn that Sunday morning, telling him this was the day to be there. Good reporter’s instincts, that man.

I was a very young child, just wrapping my mind around this whole.....

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