Talk:Forebulge

Wiki Education Foundation-supported course assignment

This article was the subject of a Wiki Education Foundation-supported course assignment, between 23 August 2021 and 7 December 2021. Further details are available on the course page. Student editor(s): Cashworth6. Peer reviewers: Gpierce55.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 21:38, 16 January 2022 (UTC)

Student Evaluation

Hi, I am a student at Georgia Tech and I will be editing this article for my course. It looks like the article needs some fleshing out. I will be looking over the provided citations and hopefully adding more to help grow this topic. If there are any suggestions, let me know,

Thanks,

Chelsea

Cashworth6 (talk) 18:20, 14 October 2021 (UTC)

Flexure, not flow

A forebulge is created by flexure of a rigid plate. When a plate is flexed, it responds in a way that is given by the 4th-order differential equation commonly known as the "plate", "bending" or "flexure" equation. This causes it to bend down beneath an applied load, but to rise up by about 4% of the downward flexure at a characteristic distance outbound of the load. Then it drops by another 4% of that 4% at another characteristic distance (but by this point, it's so tiny that it's hard to see), so that's why we talk only about the forebulge.

If this were entirely mantle-controlled, as is being proposed, there would be no semi-discrete forebulge. There would just be an overall raising of the surface outbound of the ice sheet in some diffusional/exponential fashion that would diffuse outward with time until the entire surface of the Earth would be raised by an appropriate amount (given enough time).

In Turcotte and Schubert's Geodynamics (one of my favorite physics cookbooks), there's a nice description of this; if you can't get it on google books or somewhere, I'd be willing to scan the pages.

Awickert (talk) 08:20, 24 March 2009 (UTC)