* Astronomy

Members Login
Username 
 
Password 
    Remember Me  
Home -> Astronomy News -> General news -> Volcanoes
Post Info TOPIC: Volcanoes
Blobrana


L

Posts: 131433
Date:
RE: Volcanoes
Permalink  
 

Sentinel satellites to monitor every volcano

A UK-led team of scientists is rolling out a project to monitor every land volcano on Earth from space.
Two satellites will routinely map the planet's surface, looking for signs that might hint at a future eruption.
They will watch for changes in the shape of the ground below them, enabling scientists to issue an early alert if a volcano appears restless.
Some 1,500 volcanoes worldwide are thought to be potentially active, but only a few dozen are heavily monitored.
Read more



__________________
Blobrana


L

Posts: 131433
Date:
Permalink  
 

Trinity researchers find way to track volcano's history

Researchers at Trinity College Dublin have discovered a way to track the history and "personality" of a volcano by studying tiny mineral crystals that form in lava. The remarkable thing about the approach is that it relies on analysing minute crystals just a millimetre or two across that originally formed several kilometres beneath the surface.
Read more



__________________
Blobrana


L

Posts: 131433
Date:
Volcanic plumes
Permalink  
 

ISU geoscientists study volcano plumes

In the morning of April 23, Idaho State University volcanologists were setting off an artificial volcanic eruption plume in a the ISU Volcanic Simulation Laboratory; later that day, using the knowledge they collected in that lab, these scientists were analysing Chiles Calbuco volcano eruption, charting the plumes characteristics.
Read more



__________________
Blobrana


L

Posts: 131433
Date:
RE: Volcanoes
Permalink  
 

Understanding the copper heart of volcanoes

Copper forms in association with volcanoes such as those around the Pacific Ring of Fire but the nature of this association has never been entirely clear. Copper ore is predominantly in the form of copper-iron sulphides so an enduring problem has been how to simultaneously create enrichments in both copper and sulphur. Volcanoes rich in copper tend to be poor in sulphur and vice versa.
To resolve this copper-sulphur paradox, a Bristol team, working in collaboration with BHP Billiton, the world's largest mining company, drew on observations of modern arc volcanoes, including several in Chile, source of most of the worlds copper, to postulate a two-step process for porphyry copper formation.
Read more



__________________
Blobrana


L

Posts: 131433
Date:
Permalink  
 

Volcano Lava Sample

Spoiler

 



__________________
Blobrana


L

Posts: 131433
Date:
Permalink  
 

Impact of magma input rate on magma chamber growth - granite intrusion or volcanic eruption?

A computational approach which links processes deep below a volcano to potential eruptions is described by researchers at the University of Bristol in a paper published today in the Journal of Geophysical Research. The research could ultimately help scientists to understand magma chamber processes and volcanic eruption timing.
Violent volcanic eruptions can lead to collapse of the solid lid above the drained magma reservoir and create a depression called a caldera. Such caldera-forming eruptions are among the most devastating natural processes on Earth, threatening not only nearby settlements but also impacting upon the global climate. 
Read more



__________________
Blobrana


L

Posts: 131433
Date:
Permalink  
 

Swelling volcanoes could help predict eruptions in Alaska, elsewhere

A new study of Indonesian volcanoes conducted by two University of Miami researchers could hold vital clues to the future of predicting explosive eruptions from volcanic peaks around the globe.
Using data obtained from a satellite-based system known as Interferometric Sythetic Aperture Radar (InSAR), PHd student Estelle Chaussard and her advisor Falk Amelung were able to discern tiny movements in the earth's surface near 79 volcanoes in the highly-volcanic west Sunda arc in Indonesia. They observed "inflation," or a swelling of the earth at six volcanoes using data obtained between 2006 and 2009. In three of those six instances, the volcanoes erupted after observing the inflation.
Read more



__________________
Blobrana


L

Posts: 131433
Date:
Permalink  
 

What is it like to be a volcanologist?

Volcanologists are among science's most adventurous researchers, travelling to some of the planet's more remote places to try to better understand one of nature's most powerful and destructive forces - the volcano.
Read more



__________________
Blobrana


L

Posts: 131433
Date:
Permalink  
 

 Autopsy of a eruption: Linking crystal growth to volcano seismicity

A forensic approach that links changes deep below a volcano to signals at the surface is described by scientists from the University of Bristol in a paper published today in Science. The research could ultimately help to predict future volcanic eruptions with greater accuracy.
Using forensic-style chemical analysis, Dr Kate Saunders and colleagues directly linked seismic observations of the deadly 1980 Mount St. Helens eruption to crystal growth within the magma chamber, the large underground pool of liquid rock beneath the volcano.
Dr Saunders and colleagues studied zoned crystals, which grow concentrically like tree rings within the magma body. Individual zones have subtly different chemical compositions, reflecting the changes in physical conditions within the magma chamber and thus giving an indication of volcanic processes and the timescales over which they occur.
Read more



__________________
Blobrana


L

Posts: 131433
Date:
Permalink  
 

  Volcanic plumbing exposed
 
Two new studies into the "plumbing systems" that lie under volcanoes could bring scientists closer to predicting large eruptions.
International teams of researchers, led by the University of Leeds, studied the location and behaviour of magma chambers on the Earth's mid-ocean ridge system - a vast chain of volcanoes along which the Earth forms new crust.
They worked in Afar (Ethiopia) and Iceland - the only places where mid-ocean ridges appear above sea level. Volcanic ridges (or "spreading centres") occur when tectonic plates "rift" or pull apart. Magma (hot molten rock) injects itself into weaknesses in the brittle upper crust, erupting as lava and forming new crust upon cooling.
Magma chambers work like plumbing systems, channelling pressurised magma through networks of underground "pipes".
Read more 



__________________
1 2 3 … 8  >  Last»  | Page of 8  sorted by
Quick Reply

Please log in to post quick replies.
Home -> Astronomy News -> General news -> Volcanoes


Create your own FREE Forum
Report Abuse 		Powered by ActiveBoard