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Rockaholic Adventures

Rockaholic Adventures is the place for conversation and discussion about outdoor excursions. You'll also read reviews written from the perspective of today's technologically-advanced outdoorsman - one with a background in engineering and geology. Here, you'll find everything from discussions about geology-related engineering disasters to insights about how advances in technology have transformed modern-day extreme sports.

Rockaholic Adventures also covers topics such as urban planning and other anthro-induced changes to the access and preservation of natural areas. The blog's owner, Shawn, holds an A.S. from Hudson Valley Community College (HVCC) with a concentration in science and engineering, and a B.S. from the State University of New York (SUNY) at Albany with a major in geology.

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5 comments

Clouds in the Sky Keep Us Standing In-Line

Posted June 15, 2011 3:38 PM by Shawn

Last month, a significant eruption of the Grímsvötn volcano in Iceland reminded us just how valuable air space can be. Thousands of passengers were grounded and approximately 900 flights delayed, as volcanic ash jeopardized air travel.

The recent eruptions in Iceland are typical of hot spots and mid-ocean ridges. In Iceland, dense lava flows buried by glaciers have released a considerable amount of volcanic ash, greatly affecting European air travel. These dense magnesium and iron-rich lava flows are locally abundant, emanating along a spreading ridge. The hot spot has caused the formation of Iceland and the surrounding island chain in the mid- Atlantic. High temperature gradients, an abundance of geothermal forces and a rather thin section of Earth's crust characterize these eruptions. The diverging tectonic plates leave us with an abundant supply of lava, filling the gap with regular patterns of volcanic activity. As quickly as the headlines of Grímsvötn diminished, we now turn our eyes south to Chili.

The eruptions of the Puyehue-Cordon Caulle Volcanic Complex (PCCVC) in Chile are associated with the "Ring of Fire." The flow of lava in this location is fed by a subduction complex. Lava flows in this location are basaltic-rich. Although similar in composition, as there is only a negligible amount of crustal contamination in the rising magma, the dynamics behind the lava flow are significantly different. The rising magma and underlying calderas are fed by a subduction complex, or rather the melting of the subducted slabs which are remnants of the Pacific plate. By nature, these volcanic eruptions are more violent and are known to be associated with the largest recorded earthquake in modern history, the 1960 Valdivia earthquake.

The current eruption in Chile is typical of volcanic activity along a volcanic arc. Rising mamga is collected in calderas, melting away silicate-rich rocks in the continental crust. The associated volcanoes lie dormant for decades if not centuries before a new vent is found, allowing the building pressure from rising magmas to be released. The display in Chile is much more significant, however, as European and North American air travel remains unaffected; its occurrence seems to hold modesty to its true explosive nature.

Resources:

http://en.wikipedia.org/wiki/List_of_volcanoes_in_Chile

http://en.wikipedia.org/wiki/Puyehue-Cord%C3%B3n_Caulle

http://www.ainonline.com/news/single-news-page/article/air-travel-disruptions-from-chile-volcano-spread-across-south-pacific-30006/

http://earthquake-report.com/2011/06/12/series-of-moderate-earthquakes-in-chile-argintina-lake-district-may-set-off-the-eruption-of-puyehue-cordon-caulle-volcanoes/

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Guru

Join Date: May 2010
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#1

Re: Clouds in the Sky Keep Us Standing In-Line

06/16/2011 10:32 AM

"The display in Chili is much more significant, however, as European and North American air travel remains unaffected; its occurrence seems to hold modesty to its true explosive nature"

What?

as in what on earth are you trying to say?

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Power-User

Join Date: Apr 2005
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#2
In reply to #1

Re: Clouds in the Sky Keep Us Standing In-Line

06/16/2011 3:45 PM

That the volcanic eruptions in Chili are more significant than those that have been observed in Iceland. Shadowed by the fact that less planes have been grounded.

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Guru

Join Date: May 2010
Location: in optimism
Posts: 6998
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#3
In reply to #2

Re: Clouds in the Sky Keep Us Standing In-Line

06/16/2011 8:33 PM

Ummm well it looks like you need to proof read a bit more diligently and beware spell check handing you malapropisms. Like modesty and Chili.

Interestingly though, when expressed in two sentences, it's much clearer.

Statically, just the volume of anything is of no value. It needs to be compared to a norm. For instance number of assaults (per annum) puts the US number 1, whereas number (per annum) per head of population puts US 8th or 9th.

For a while there Tasmania was '100% grounded'. It has of course been all over the News in South America, New Zealand, Australia and South Africa.

Perhaps the distinction is, it's not affecting Americans (except possibly the ones at McMurdo).

__________________
There is no sin except stupidity. (Oscar Wilde, Irish dramatist, novelist, & poet (1854 - 1900))
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Anonymous Poster #1
#4
In reply to #3

Re: Clouds in the Sky Keep Us Standing In-Line

06/18/2011 12:21 AM

sigh

Chile

Oh, so sorry. Here: ǝlıɥɔ

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Anonymous Poster #2
#5
In reply to #4

Re: Clouds in the Sky Keep Us Standing In-Line

06/18/2011 12:40 AM

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