Author Topic: Explosive Volcanic Eruptions Caused By Mixing Magmas  (Read 630 times)

0 Members and 1 Guest are viewing this topic.

Online Buster's Uncle

  • Celebrating AC2's 10th Year- Little Terraformer That Could
  • Ascend
  • *
  • Posts: 47329
  • €795
  • View Inventory
  • Send /Gift
  • Because there are times when people just need a cute puppy  Soft kitty, warm kitty, little ball of fur  Someone thinks a Winrar is You!  
  • AC2 is my instrument, my heart, as I play my song.
  • Planet tales writer Smilie Artist Custom Faction Modder AC2 Wiki contributor Downloads Contributor
    • View Profile
    • My Custom Factions
    • Awards
Explosive Volcanic Eruptions Caused By Mixing Magmas
« on: October 13, 2012, 01:13:05 AM »
Explosive Volcanic Eruptions Caused By Mixing Magmas
By Becky Oskin, OurAmazingPlanet Staff Writer | – 2 hrs 34 mins ago.. .

Meteorologists know mixing cold air and warm air triggers powerful thunderstorms. Now, geologists have discovered a similar phenomenon at work beneath one of Europe's most hazardous volcanoes.
The Las Cañadas volcano, on the island of Tenerife near Spain, last exploded approximately 170,000 years ago, and is due for another eruption. Researchers believe they have identified what happens in the volcano's magma chamber just prior to such massive eruptions, which could help scientists predict the next blast before it happens.
A new study into the volcano reveals that pre-eruption mixing within the magma chamber — where older, cooler magma mixed with younger, hotter magma — triggered three previous large-scale eruptions. The mixing is like "putting a red-hot rock into a cup of ice," said study author Rex Taylor, of the University of Southampton in Britain.
The researchers made their find by analyzing crystal cumulate nodules (igneous rocks formed by the accumulation of crystals in magma) in deposits from prior eruptions. The nodules provide a record of the changes in the magma chamber until the moment the volcano erupted."Rims of crystals in the nodules grew from a very different magma, indicating a major mixing event occurred immediately before eruption," Taylor said in a statement.
Now that the volcano's trigger is known, monitoring changes in the magma chamber could help volcanologists predict a coming eruption. Las Cañadas, also called Mount Teide, is one of 16 Decade Volcanoes identified for study by the United Nations because of the volcano's history of destructive eruptions and its proximity to populated areas.
The volcano has frequent small lava flows every 100 years or so. Large explosions happen about every 100,000 years. These eruptions spew ash 15 miles (25 kilometers) into the air and collapse the volcanointo a caldera, sending pyroclastic flows (clouds of flowing hot gas and debris) across the island, which has more 200,000 inhabitants.
The big blasts expel more than 25 times more material than the 2010 eruption of Eyjafjallajökull in Iceland. Prevailing winds would normally take the ash out over the Atlantic, Taylor told OurAmazingPlanet in an email.
The findings are detailed in the Oct. 12 issue of the journal Scientific Reports.

At least you SF geeks have some respect for a hard science like geology, albeit the the above is somewhat light reading.  No refunds.

When the hover for this said "dangerous European volcano", I though Aetna in Sicily, or maybe Vesuvius in Naples - but never heard of this one.  I still don't think Europe is exactly Mordor.


* User

Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length

Select language:

* Community poll

SMAC v.4 SMAX v.2 (or previous versions)
21 (7%)
XP Compatibility patch
9 (3%)
Gog version for Windows
89 (30%)
Scient (unofficial) patch
34 (11%)
Kyrub's latest patch
14 (4%)
Yitzi's latest patch
87 (30%)
AC for Mac
2 (0%)
AC for Linux
6 (2%)
Gog version for Mac
11 (3%)
No patch
15 (5%)
Total Members Voted: 288
AC2 Wiki Logo
-click pic for wik-

* Random quote

I think, and my thoughts cross the barrier into the synapses of the machine - just as the good doctor intended. But what I cannot shake, and what hints at things to come, is that thoughts cross back. In my dreams the sensibility of the machine invades the periphery of my consciousness. Dark. Rigid. Cold. Alien. Evolution is at work here, but just what is evolving remains to be seen.
~Commissioner Pravin Lal 'Man and Machine'

* Select your theme