Faut-il espérer l’éruption d’un supervolcan pour refroidir le climat ? □ La progression silencieuse vers une super-éruption. Changements terrestres - Résumé SOTT 2013. Yellowstone Volcano Eruption in 2014? Are Animals Fleeing Park As 'An Alert'? A number of bloggers are posting videos that show bison and other animals allegedly leaving Yellowstone National Park, prompting theories that as earthquakes ramp up the seismic activity will set off the Yellowstone supervolcano.
Two of the main bloggers behind the discussion stress that there’s no way to know when the supervolcano will go off but note that the 4.8 magnitude earthquake that hit on March 30 seemed to set off a reaction from the animals, who are moving for a reason. “Whether I believe this, or whether I don’t believe the story or not, I don’t know. I can tell you this story I saw this morning about the buffaloes running the street … whether or not it’s because of any activity in Yellowstone or not, I don’t know,” said blogger Jay Lee, who posted a story on his site tatoott1009.com.
Le plus grand volcan du monde dort sous le Pacifique. Intensification de l'activité volcanique à Yellowstone et ailleurs dans le monde. Carte de l'activité volcanique en direct des volcans du monde. Colima, Mexique, 3860 mDépêche n°6980 du 07-04-2014Un point sur l'activité en cours sur le...Suite de cette dépêche pour le volcan Colima Etna, Italie, 3330 mDépêche n°6975 du 02-04-2014Une activité est de retour.
Source :Suite de cette dépêche pour le volcan Etna Dépêche n°6964 du 27-03-2014Plus d'effusion ce matin. Supervolcano forming north of New Zealand. A supervolcano forming north of New Zealand could spell the end of the world - but there is no need to panic, it won't happen for at least 100 million years.
Researchers from the University of Utah have warned of impending doom after discovering that two or more continent-sized piles of rock are colliding as they move at the bottom of Earth's thick mantle, 2896km beneath the Pacific Ocean near Samoa. They said the movement could be the beginning of a vast eruption that could threaten life on earth in 100 million to 200 million years. "What we may be detecting is the start of one of these large eruptive events that - if it ever happens - could cause very massive destruction on Earth,'' said seismologist Michael Thorne, the study's principal author and an assistant professor of geology and geophysics at the University of Utah.
"This is the type of mechanism that may generate massive plume eruptions, but on the timescale of 100 million to 200 million years from now. Volcan-Yellowstone.com - Supervolcan de Yellowstone en temps réel, alerte surveillance actualités forum. Yellowstone : Le supervolcan pourrait entrer en éruption sans crier gare. Si l’on pensait jusqu’à maintenant que l’entrée en éruption des supervolcans était précédée par des signes avant-coureurs extérieurs, une nouvelle étude publiée dans la revue Nature montre qu’il n’en est rien.
À Yellowstone, le supervolcan pourrait donc entrer en activité sans facteur déclencheur tel un tremblement de Terre qui viendrait fissurer la croûte terrestre. Pour tenter de comprendre si les conditions extrêmes qui règnent dans la chambre magmatique des supervolcans sont suffisantes à elles seules pour déclencher leur entrée en éruption, des chercheurs ont utilisé une machine à rayons X développée à Grenoble. Capable de prendre des mesures de densité précises à des températures allant jusqu’à 1.700°C et à des pressions supérieures à 36.000 fois la pression atmosphérique normale, l’appareil à montré que la densité du magma diminuait significativement lorsque les températures et la pression augmentaient.
L’appareil utilisé par les chercheurs. © Blascha Faust, ESRF. Yellowstone Volcano Eruption in 2014? Are Animals Fleeing Park As 'An Alert'? Istituto Nazionale di Geofisica e Vulcanologia. Amazing Etna Eruption 16 december 2013 HD . Etna Eruzione. A rain of volcanic stones in Sicily - Pioggia di lapilli su Giardini Naxos. Volcano Alert: A System to Warn Us About the Next Major Iceland Eruption - Wired Science. Map of volcanic activity monitoring devices in Iceland.
Thomas Porostocky With more than 30 active volcanoes, Iceland is one of the most tectonically active spots on Earth, and each eruption has the potential to send all of Europe into an economic tailspin. (Remember how Eyjafjallajökull shut down air traffic over the continent in 2010?) So a coalition of 100 European and US scientists calling itself FutureVolc has been working to get ahead of the problem. With Freysteinn Sigmundsson, a geophysicist at the University of Iceland, they’ve been covering the country with monitoring devices in an effort to use the data to scout signs of an impending eruption.
Geodetic GPS Receivers Mounted on rock outcrops, these monitor how the ground swells by centimeters as it fills with magma just prior to eruption. Why have 10 major volcanoes along the Ring of Fire suddenly roared to life? © Wikimedia CommonsThe Pacific Ring of Fire.
Ten major volcanoes have erupted along the Ring of Fire during the past few months, and the mainstream media in the United States has been strangely silent about this. But this is a very big deal. We are seeing eruptions at some volcanoes that have been dormant for decades. Yes, it is certainly not unusual for two or three major volcanoes along the Ring of Fire to be active at the same time, but what we are witnessing right now is highly unusual.
And if the U.S. media is not concerned about this yet, the truth is that they should be. Sadly, most Americans cannot even tell you what the Ring of Fire is. The Ring of Fire is an area where a large number of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean. An easy way to think about the Ring of Fire is to imagine a giant red band stretching along the perimeter of the Pacific Ocean. 10 major volcanoes along the Ring of Fire have suddenly roared to life in recent months. Active Volcano Discovered Under Antarctic Ice Sheet. Earthquakes deep below West Antarctica reveal an active volcano hidden beneath the massive ice sheet, researchers said today (Nov. 17) in a study published in the journal Nature Geoscience.
The discovery finally confirms long-held suspicions of volcanic activity concealed by the vast West Antarctic Ice Sheet. Several volcanoes poke up along the Antarctic coast and its offshore islands, such as Mount Erebus, but this is the first time anyone has caught magma in action far from the coast.