Talk:Subsidence

Points

I don't have time to work on this right now, but a couple of points:

1) Faulting: you have the meaning of hanging wall and footwall reversed, i.e. the hanging wall of a normal fault subsides.

2) Isostatic rebound: This name is misleading. Loading of the Earth's crust (technically this should be "lithosphere", in this context) by glaciers, sediment, etc., causes isostatic subsidence. Unloading when this weight is removed causes isostatic uplift, which is then called isostatic rebound. A better name for the section would be "isostacy", or "isostatic subsidence", because "isostatic rebound" is actually uplift (the opposite of subsidence)

3) Gas Extraction: Probably this section should be "pore fluid extraction", to include gas extraction (e.g. Mississippi Delta) but also groundwater extraction (e.g. Mexico City) as causes of subsidence.

Good start though. I will try to get back and do some edits when I have time.

- Matt W —Preceding unsigned comment added by 63.231.170.133 (talk • contribs) 22:40, May 6, 2006

the chicken or the egg...

I dont like this subject —Preceding unsigned comment added by 88.97.181.98 (talk) 14:23, 6 May 2008 (UTC)

Lavenham's Crooked House

Lavenham's Crooked House.

It is highly possible that this is allso a case of subsidence. What else could it be? Hafspajen (talk) 12:12, 2 October 2013 (UTC)

No, it is not. The timbers have warped over time causing the upper floor to look distinctly crooked - hence the name. Hafspajen (talk) 12:15, 2 October 2013 (UTC)

Subsidence in Florida

Today, as in many other days, I heard about the ocean rising in Florida. I suspect, and so do several studies (state and federal) that the ground is dropping not the sea rising. However, as expected the term "rising sea" is used instead of the term "land is dropping". Must be more $grants$ for the first. 24.128.186.53 (talk) 15:15, 17 January 2015 (UTC)

Looking at the published peer-reviewed literature, Florida is not subsiding (“dropping”) on a regional scale. Although here is local subsidence in the form of sinkholes, pennisular Florida overall appears to be rising as a result of uplift driven by combination of (1.) flexural isostatic uplift in response to carbonate rock dissolution; (2) glacio-hydro-isostatic tilting/back-tilting during loading and unloading of North America Laurentide ice sheet during the Pleistocene; and (3.) mantle convection-driven dynamic topography. These ideas are discussed in:

Adams, P.N., 2018. Geomorphic origin of Merritt Island-Cape Canaveral, Florida, USA: A paleodelta of the reversed St. Johns River?. Geomorphology, 306, pp.102-107.

Adams, P.N., Opdyke, N.D. and Jaeger, J.M., 2010. Isostatic uplift driven by karstification and sea-level oscillation: Modeling landscape evolution in north Florida. Geology, 38(6), pp.531-534. Paul H. (talk) 14:55, 19 September 2018 (UTC)

List of major land subsidence events

Could we get a list of major land subsidence regions and perhaps correlate that with earthquakes and tremors? MaynardClark (talk) 18:20, 20 September 2017 (UTC)

• 2017 Earthquakes

• Mexico City

Unless it has already been done by either some governmental agency, e.g. the USGS, or NGO, e.g. American Geological Institute or Seismological Society of America, compiling such a list is going to be a very difficult operation, which would involved an enormous amount of original research. To compile a credible list and reliably correlate it with earthquakes, a person would have look through an enormous amount of literature. The practicle way to do this would be to find someone, who has already done and published it. Paul H. (talk) 14:55, 19 September 2018 (UTC)

References