Talk:Caldera

message: The term "Caldera" was introduced in to the geological vocabulary as a result of Leopold von Buch's visit to the Canary Islands in particular Tenerife and then La Palma. In fact his journal distinguishes between the Las Canadas Caldera and the Caldera de Taburiente as follows "... The area we were in looked as if it had been created by the outpouring of rocks from the very bowels of the Earth. I asked my guides what name this place had and they told me that it was named "El Caldera de las Canadas." I noted that a large volcano which the guides called El Teide, stood guard over the caldera and that also there were cliffs that were almost vertical. As we ventured further into the caldera I decided that this area had not only been born from the bowels of the Earth, but it also must have at some time in the past descended into those same bowels. Later when we were eating one of my guides gave me a local broth in a bowl and informed me that the broth was made from chickens, but that it was in a "caldera" the very bowl my broth was in. From this I deduced that the Spanish term for a bowl was in fact "Caldera," and realised why the local name for the great depression we had visited was also called a caldera. Later when I visited La Palma I was taken by my guides to visit a great depression which we entered via a narrow gorge. Suddenly the vista changed and I was looking at an immense depression, with cliffs which attained a height greater than those I had seen at the Las Canadas. It was obvious though that whilst they were both caldera's, the caldera on Tenerife had been created in a different manner to that on La Palma. I consider the caldera on Tenerife to be formed by the activity of the volcano, but a different process has caused the caldera de Taburiente which is the name the local citizens call it..."The Geologist (talk) 17:11, 10 April 2012 (UTC)
replies: text: Carboxen, Thanks for the updated information. I agree that whilst its usage pre-dates von Buch, the term as used in geology and volcanology did not exist. It was only after von Buch published his memoirs that the term entered the geological vocabulary. Thanks again for the information.The Geologist (talk) 18:43, 16 September 2015 (UTC)
thread_title: Terminology

message: Should probably be split into two or more pages.  There were at least two companies by the name of Caldera (Caldera Systems, Inc., and something else) at the same time for a while. —Mulad
Since this is a geology / volcanolgy page it is the companies that are at fault. The Geologist (talk) 16:27, 1 May 2008 (UTC)
thread_title: Split

message: 207.118.9.58 01:25, 7 November 2006 (UTC)
thread_title:  Confusion 

message: After the article says 'When Mount St. Helens erupted' .. there should be a date. But are they talking about the 1980 eruption?
207.118.9.58 01:20, 7 November 2006 (UTC)
thread_title:  1980? 

message: I do not understand at all what a volcanic edifice is.. Please explain...
Edifice means "Structure" from the latin "Edifico" which means "I build." Hence "Volcanic edifice" is the volcanic structure. The Geologist (talk) 16:28, 1 May 2008 (UTC)
replies: text: An edifice is a massive or imposing building/structure/natural-formation, usually rising vertically (or near vertical) up out of something. Chaosdruid (talk) 21:08, 4 January 2015 (UTC)
thread_title:  volcanic edifice 

message: Is it calderas or caldera for the proper plural form of this phenomenon? Sochwa (talk) 03:17, 30 March 2008 (UTC)
thread_title: multiplicity

message: "Yellowstone caldera ... erupted"? Is the caldera not the indirect result of an eruption?  Or was there a caldera before, that re-erupted?   71.233.0.99 (talk) 00:58, 4 January 2009 (UTC)
thread_title: correct wording?

message: The image states that santorini happened in 3615 BP most people have no clue what the hell is that. I request that the date be changed to the CE calendar or at least a note stating that date.  —Preceding unsigned comment added by Nemo1986 (talk • contribs) 15:35, 21 March 2009 (UTC)
replies: text: The 'BP' was linked, so people should have some clue I would hope. If you look at the Santorini page you will see a range of ages depending on whether you use archeological or radiocarbon dating. The discrepancy between these two shows no sign of disappearing. That aside I will put '1600 BCE' in brackets after the date on the Caldera page ( I know that 1600 + 2009 does not = 3615, but we are talking approximate here), unless you feel like being bold and beating me to it. Mikenorton (talk) 15:54, 21 March 2009 (UTC)
thread_title: date of santorini

message: Caldera Timeline Picture is necessary. People deepen the scientific understanding to the caldera by the picture.  --AvengerX (talk) 16:59, 4 January 2010 (UTC)
replies: text: Timeline of what? --Guanlong wucaii 16:25, 15 February 2010 (UTC)
thread_title:  Timeline Picture 

message: The article opens with: "A caldera is a cauldron-like volcanic feature usually formed by the collapse of land following a volcanic eruption. They are sometimes confused with volcanic craters." Neither here nor anywhere else is it explained precisely what a caldera actually is, nor how it differs from a volcanic crater. If they are sometimes confused, then all the more reason to clear up this potential misconception. The images provided are no help in any of this, as they do not label either the caldera or the crater. Whatthefat (talk) 18:15, 27 June 2012 (UTC)
replies: text: grossly simplified - caldera is a collapsed dome while crater is one where the dome has been blown away. Caldera formation is instant but craters can form instantly or through prolonged activity. Richiez (talk) 23:45, 28 December 2012 (UTC)

text: A caldera is a surface depression resulting from a magma-chamber roof collapse. Any old arbitrarily large crater is not a caldera (and I've been having minor troublehttps://en.wikipedia.org/w/index.php?title=Caldera&type=revision&diff=1055164595&oldid=1055161786 in that regard). And, as we have seen recently at Kilauea (2018), the collapse doesn't have to be "instant", but can progress in stages. :2601:444:300:EA10:24A7:DBA4:7903:4B50 (talk) 07:31, 14 November 2021 (UTC)
thread_title:  So What is a Caldera? 

message: Hi
The picture of the progression of the caldera, while great in itself as a depiction of Mount Mazama, does not adequately describe a caldera and has misleading titling.
:*The second frame seems to be showing us a "Caldera Collapse".
:*There is nothing to explain the island/water etc. in the fourth frame.
#Obviously the caldera cannot be collapsing, as it is what remains "after" the collapse. Perhaps retitling it as "Caldera Formation" might work?
#I would suggest removing the last frame, as it is specific and not all will have lakes or islands, and replacing it with either a generic cross-section or just adding text to explain that the resulting crater will fill in over time and may form a lake. The text could say something like "... continuing volcanic activity at these sites can lead to new domes growing within the caldera, forming islands within the caldera lake."
Thinking about it a little more, perhaps even simply adding some infill to frame 3? Chaosdruid (talk) 21:00, 4 January 2015 (UTC)
thread_title:  Misleading titles, more generic pic needed 

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thread_title:  External links modified 

message: I reverted an addition of Mount Tehema, California, to the list of North American calderas. I can find no Mount Tehema in Google Maps. There is a Mount Tehama, but the Wikipedia article identifies it as an eroded stratovolcano, not a caldera. I am explaining the reversion here on the off chance there really is a notable Mount Tehema that is a caldera, for which a source can be produced; or in case Mount Tehema is incorrectly identified as a stratovolcano at Wikipedia itself. Otherwise, Mount Tehema should not be in the list. --Kent G. Budge (talk) 05:04, 18 August 2019 (UTC)
replies: text: Thanks for noticing this. Caldera is very problematic term because, for example. it is often used incorrectly for any volcanic crater. My understanding of the Lassen Volcanic Centre is that an early stratovolcano (Rockland Volcano) ended its activity with the formation of a collapse caldera (due to magma chamber collapse after an explosive eruption). This caldera was then filled by another stratovolcano, Brokeoff Volcano (also known as Tehama Volcano). Williams (1932) suggested that Brokeoff/Tehama Volcano ended its activity with a collapse caldera, but this is now disputed and recent studies suggest that the Brokeoff/Tehama "caldera" is probably an erosional feature, making Brokeoff/Tehama Volcano an eroded stratovolcano, not a (collapse) caldera. GeoWriter (talk) 11:56, 18 August 2019 (UTC)
replies: text:   I thought the consensus has long been that Tehama is an erosional caldera, that is, demolished by erosion rather than eruption. The question is whether "caldera" should be extended to cover this "erosional caldera" type. The consensus seems to be to consider Tehama that, but I know of no other feature termed an "erosional caldera". Jasper Deng (talk) 13:02, 18 August 2019 (UTC)
replies: text:  I agree that Tehama has been/could be described as an erosional caldera. In my previous comment, I should probably have written "not a collapse caldera" instead of "not a (collapse) caldera". I think both types, collapse and erosional, are widely accepted by geologists as calderas. GeoWriter (talk) 13:54, 18 August 2019 (UTC)
thread_title:  Mount Tehema