Talk:Volcano

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Contents

[edit] Old talk

Can this page not be protected, poor thing it must feel very insecure with all these vandalising attacks over the last few weeks.

TonyClarke 15:42, 20 Nov 2003 (UTC)

Please atualize this page

Image:Volcano.jpeg | Mt St Helens volcano eruption Image Number: AC80-0513-29 Date: 1980 - NASA photograph http://commons.wikimedia.org/wiki/Volcano

[edit] Erupted material

Anyone could add about lahar and volcanic ash in erupted material section?Aditthegrat 15:59, 15 May 2006 (UTC)

Y'all will notice a rather drastic edit to this section; my logic is, it was getting messy. I've tried to do more re-organising than re-writing; I've also added a reference (this whole article needs more citing). Any thoughts? Archaen sax 01:25, 20 June 2006 (UTC)

[edit] Cryovulcanism

There does not yet seem to be a Wikipedia article on cryovulcanism or 'ice volcanoes'. This process has been observed on Neptune's moon Triton and may also be important on Saturn's moon Titan and the asteroid Quaoar. It would be great to have some information on cryovulcanism, but I'm not qualified - maybe someone who has worked on this page would be interested to write something? The Singing Badger 00:56, 16 Dec 2004 (UTC)

It's volcano, not vulcan-o, so see article at cryovolcano. Enjoy! -- Epastore 13:58, 21 August 2006 (UTC)

[edit] Relationship between volcanic eruptions and the lunar cycle

National Geographic have shown a progam called Are Volcanic Eruptions Tied to Lunar Cycle?, where scientist Steve O'Meara claims there's a relationship between volcanic eruptions and the lunar cycle, just as there is for tidal water. Could someone please elaborate on this theory, and maybe extend the artice to cover wether this theory is true or false. Thanks in advance. --Fredrik Orderud 21:15, 26 May 2005 (UTC)

[edit] Melting

rock of the earth's interior made molten or liquid by high pressure and temperature

This isn't true. Higher pressure increases rock's melting temperature. Rock melts if pressure is decreasing. Main factors that lower rock's melting temperature are decreasing pressure and water content inside melt. Siim 11:40, 14 July 2005 (UTC)

See an error - fix it, done :-) Vsmith 02:54, 16 July 2005 (UTC)

[edit] Blast effects...

Remove anon. section addition here for consideration and possible cleanup. It was in the wrong place in the article and facts need verification.

Blast effects from a volcanic eruption
Blast effect from a volcano eruption are the most violent events on planet earth. A volcano may release as much as 10 EXP+20 acoustic watts of power, or around 270 to 320 decibels. When a volcano erupts all at once as in a bomb explosion it may disintegrate and eject cubic miles of earth and generate massive shock waves which can be measured anywhere around the earth. During the eruption of Mt. St. Helens in 1980 (a medium volcano eruption) the shock wave blew down all the trees around it, even those that were 16 and 17 miles away! Some of these trees were 7 feet in diameter and over 500 yaers old. The shock wave completely flattened 86,600 acres of forest. It also blew out windows in Seattle over 200 miles away, and could be heard over 690 miles away in Maple creek Saskatchewan Canada. The recent eruptions of mexico's Popocatépetl threw house size magma chunks about 2 miles high and had hang times of about 1 minute! The eruption of Krakatoa Indonesia 1889 could be heard 3000 miles away and generated tidal waves over a mile high. Barometers would fluctuate wildly at 100 miles. For a more in depth look at the loudness of a volcano and it effects check out:

Vsmith 17:00, 7 August 2005 (UTC)

[edit] Eruption Tracking?

I'm very impressed with the coverage of the Atlantic Hurricane Seasons, but I can't find a similar set of pages for Volcanic Eruptions. (Sudden interest in natural disasters.) Is there one? --The preceding unsigned comment was added by 66.167.139.120 (talk * contribs) 11:36, 28 August 2005 (UTC)

  • There are several problems with such coverage. Due to lack of forecasting ability, eruptions are only known after they happen. They also generally affect a small area and are of specialized interest. Category:Active volcanoes was created recently, but that includes volcanoes over a rather wide time period due to the long time scale involved in magmatic actions (the category was initially created from a search of existing articles and there probably are omissions). Perhaps a List of eruptions of active volcanoes could be made, with an entry for each year, decade, or century as appropriate. Details of individual eruptions are placed in the articles for each volcano. Volcanic eruptions also appear in WikiNews. (SEWilco 17:59, 29 August 2005 (UTC))
  • Active volcano is rather small. (SEWilco 18:01, 29 August 2005 (UTC))

[edit] Hot mafic flows in Hawaii?

Check a fact? under 'Shield volcanoes', "Their lava flows are generally very hot and very fluid...". I believe they are fluid entirely due to composition, and not due to particularly high temperature... but I'm not sure enough to remove/edit that. --Leperflesh 20:13, 28 December 2005 (UTC)

Viscosity is dependent on at least 6 things: pressure, temperature, volatile content (i.e. gases that are trying to escape), chemical composition, crystal content and bubble content (see Volcanic Successions, R.A.F. Cas and J.V. Wright, 1988, Unwin Hyman ISBN 0-04-552022-4 )... So not entirely due to composition, but it's true that shield volcanoes have mafic flows; fixed it. Archaen sax 01:36, 19 June 2006 (UTC)

[edit] Friction causes melting of subduction plates?

Twice in the article, it is asserted that friction between the subducting oceanic plate causes the melting of materials, leading to upwelling and eruption of volcanic arcs. However, I was taught that the melting occurs due to the higher temperature of the mantle region below the subducting plate. I am hesitant to remove the reference, but I'd like to see either citation of this theory's conclusivity, or inclusion of other theorized mechanisms for partial melting. --Leperflesh 20:48, 28 December 2005 (UTC)


[edit] Where There's Smoke There's .. Smoke

The article includes the text:

The truth is that a volcano seldom emits either smoke .. What is mistaken for smoke consists of vast volumes of fine dust .. mingled with steam and other vapors..

This description sounds a lot like smoke to me..

Can anyone please clarify? --Philopedia 19:55, 29 April 2006 (UTC)

It's called aerosol Cuzandor 03:26, 19 May 2006 (UTC)

[edit] Typos and Grammar

Could someone check for typos and grammar errors? Thanks. Josen 16:43, 7 June 2006 (UTC)

[edit] Splitting

I think this article is way to long. The whole section on Volcanology could be turned into a whole separate article. I am willing to split the article and write new introductions etc. where appropriate, but as the article is being considered to be included in the CD, I thought I should check with people first. I will have to check, but some of the stuff in the Volcanology section is probably covered in Volcanology. Heavy Metal Cellist talkcontribs

It sounds like a good idea to me to split the article, but I think the article itself needs to be better organized. It also seems a bit patchy in places, which is probably a result of different people contributing different sections at different times. I don't think there is much overlap between the section on volcanology and the content of the volcanology article, since the latter is mostly about the history of the field and lacks a description of what volcanologists actually do. Jim_Lockhart 05:54, 9 June 2006 (UTC)
I have restructured many of the articles on Volcanoes. I moved information around, restructuring as I thought appropriate. Here are the pages I changed or created: Volcano, Volcanology, History of Volcanology, and Volcano Prediction. I DID NOT DELETE ANYTHING. I simply moved things around to reduce page size. All content is still there, just some sections are in different pages. Heavy Metal Cellist talkcontribs
Sounds good. I'm about to leave on a trip, so I won't have a chance to take a look until Tuesday US east-coast time at the earliest, but other contributors will probably have thoughts and ideas. Best regards, Jim_Lockhart 05:10, 10 June 2006 (UTC)

[edit] Notable Volcanoes on Earth

This list is very long, and doesn't seem to be ordered alphabetically or by country, or anything. What do people think about scrapping it, but linking to Decade Volcanoes?

Otherwise I'd link to both Ol_Doinyo_Lengai, Tanzania, because it's the only Carbonatite-lava volcano on Earth (very exciting for geologists), and Nevado_del_Ruiz, Colombia, because in 1994 it wiped out an entire town of 23,000 people. Archaen sax 13:48, 14 June 2006 (UTC)

Replaced the random list with the 16 Decade volcanoes. Vsmith 15:53, 14 June 2006 (UTC)

[edit] Volcano or Mountain?

Bold text Is mount Apo a volcano but known as a mountain? What is the condition of Mt. Apo this 2006?

[edit] Pictures Montserrat

Hi. I am a newbie. Pro Photographer providing images to support Wikipedia articles, where I have them. Images are provided Free of Use for Wikipedia only; this is because other publications buy my pictures; I need to protect my copyright and ensure proper accreditation. There has been some controversy around this, making my intial experience of Wikipeida fraught. An initial mediators opinion is that my work is good for Wikipedia and appears to be within the rules. User talk:Desk1

A few years ago I undertook a helicopter fly-over shoot of Montserrat and got some nice general and semi technial pictures of the lava flows, landscape and township damage. Also got some reasonable close-ups of hot rock. Would article contributors be interested in me uploading a few of these for you to insert in your article if relevant? Best wishes, DP Kilfeather (Des) Desk1 10:46, 5 September 2006 (UTC)

[edit] this is for my world geography class

I was just wondering how a volcanic eruption occurs...please email me and tell me as soon as possiable...thanks...Melissa..

ezekiel-sweetie@hotmail.com

[edit] Definition

The page does not attempt to define or even explain what a volcano is! You are supposed to already know! A brief defining paragraph at the top would be a good idea, no?

good observation! I have added a basic definition that I think covers all the possibilities without being too vague. --Leperflesh 22:16, 13 October 2006 (UTC)

[edit] Volcanic Soil

Would somebody please send me an e-mail telling me what plants grow on volcanin soil

[edit] Hawaii listed as volcano formed by divergent plate boundary.

Quote,

Divergent plate boundaries create new seafloor and volcanic islands, such as Cjertce and Hawaii. Sometimes it can form in the ocean.

According to my Geology textbook, Hawaii is an example of intraplate igneous activity or hotspot. Can this be fact checked?

"Essentials of Geology" ninth edition. Author's Fredrick K. Lutgens and Edward J. Tarbuck. Pages 109-110

Thank you,

TomDolan 05:54, 23 November 2006 (UTC)Tom Dolan

Removed that erroneous bit. Thanks for pointing it out. Vsmith 15:52, 23 November 2006 (UTC)

No problem, glad to contribute something (small) to Wikipedia.

TomDolan 23:06, 24 November 2006 (UTC)Tom Dolan


[edit] Past Beliefs

I think that the statement in this section, that "Before it was understood that most of the Earth's interior is molten", is misleading. I'm not a geology expert, but surely most of the mantle, at least, is solid, albeit close to melting point? Do any experts want to clarify this or am I completely wrong? Gsalter 12:25, 13 December 2006 (UTC)

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