Talk:Isostasy

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Isostatic effects of plate tectonics is quite clear and consistent with the other headings. Isostasy and plate tectonics as a heading would have important historical connotations not covered in the section. Vsmith 03:11, 16 August 2005 (UTC)

"A second significant cause of eustatic sea level rise is thermal expansion of sea water, when the Earth's mean temperature increases" - thermal expansion is a steric component of sea level rise not eustatic. User:WolfousUK 13:03, 3 December 2006 (GMT)

" The Three models need to be further explained in order to clarify the differences between them " (193.50.44.5 18:32, 18 January 2007 (UTC))


Archimedes principle, second paragraph, contains "an amount of water equal in volume to that of the object was displaced", should read mass instead of volume. (see entry for Arch. princ.) RiceMilk (talk) 09:40, 8 June 2010 (UTC)RiceMilk

Model Categorisation[edit]

The three models should really be a part of a wider group of models, namely that of 'Topographic Isostasy' and 'Flexural Isostasy'. Though Pratt and Airy are used individually to explain the principle of topographic isostasy, the flexural isostasty model was not solely developed by Vening Meinesz, but also Jeffreys, Gunn and Walcott - when refering to flexural isostasy you would not just refer to the 'Vening Meinesz' model, but rather the 'flexural isostasy' model. I think that both 'Topographic Isostasy' and 'Flexural Isostasy' should be used as headings with the relevant authors names referenced within them. I will not change the article at the moment, as I would like to hear other people’s opinions... -- 139.222.236.67 14:13, 10 May 2007 (UTC)

Missing from the discussion: how much down, how much up[edit]

An iceberg has 2/3 of its mass below sea level and 1/3 above. What are the comparable numbers for the continental crust? For the average oceanic crust, taking into account the ocean above it? This would seem very basic to the idea of isostacy. 96.252.103.113 (talk) 20:49, 11 December 2008 (UTC)

Second image is wrong[edit]

The second image seems to represent the light concentrated to a point by a circular lens: http://en.wikipedia.org/wiki/User:CraigNGC/subpage_PSF It may have no place in the field of isostasy. — Preceding unsigned comment added by 79.116.199.21 (talk) 14:54, 14 July 2011 (UTC)

Unfamiliar term[edit]

The term "mm/a" is used in the article, but no mention of what it means or what value it represents is provided. Can an explanation of what this means be provided? Terms and formulas that are not in common use or easily figured out by an ordinary reader should be avoided as much as possible. I studied geology, chemistry, and physics in college, and this term still remains a mystery to me. The paragraph where "mm/a" appears is in Eustasy and relative sea level change: "A second significant cause of eustatic sea level rise is thermal expansion of sea water when the Earth's mean temperature increases. Current estimates of global eustatic rise from tide gauge records and satellite altimetry is about +3 mm/a (see 2007 IPCC report). Global sea level is also affected by vertical crustal movements, changes in the rotational rate of the Earth, large scale changes in continental margins and changes in the spreading rate of the ocean floor." Thanks! Linstrum (talk) 08:07, 23 April 2014 (UTC)

Pipe linked the mm/a to millimetre/annum, although the annum is just snob speak for year. Vsmith (talk) 12:12, 23 April 2014 (UTC)