Questions tagged [isostasy]

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25
votes
1answer
8k views

How much of a mountain is below the surface?

Is there some kind of math rule for how much does a mountain extend (depth) below the surface? I found an article like this http://www.livescience.com/6595-depth-himalayan-mountain-roots-revealed....
23
votes
1answer
2k views

What were the tallest mountain ranges in Earth's geological past?

There have been numerous episodes of mountain building in Earth's geological history, particularly through the super-continent cycle. Many mountains and mountain ranges have been eroded, as mentioned ...
16
votes
1answer
1k views

How much would the Greenland landmass isostatic rebound contribute to long term climate change?

In reading the question What would the geology and climate of a supposed landmass near the pole be like, assuming a thoroughly warmer planet?, it came to mind that another factor may cause a shift in ...
12
votes
1answer
751 views

What are the non-anthropogenic causes of The Netherlands' low elevation?

A large area of The Netherlands is below sea level. There are two non-anthropogenic reasons that I can think of: Compaction of delta sediments that lie below the country, A side effect of the ...
11
votes
2answers
1k views

How high can a mountain possibly get?

Mount Everest is 8,848 metres (29,028 feet) above sea level and is the result of a continental plate smashing into another continental plate. Can a tectonic process build a mountain that's even higher?...
9
votes
1answer
282 views

Is altitude of everything decreasing due to sea level rise?

We know that sea level is rising, though some people say climate change is fake. Altitude is defined as the height of something measured from sea level. Since sea level is increasing, and the ...
8
votes
1answer
595 views

What evidence is there linking melting ice caps and changes in tectonic movement?

Reading one of my other questions, How much would the Greenland landmass isostatic rebound contribute to long term climate change?, a subsequent question is what, if any, effect the isostatic rebound ...
7
votes
1answer
210 views

How to calculate hydrostatic equilibrium?

I'm trying to solve the following problem. The sea level in the past was 200 m higher than today. The seawater became in isostatic equilibrium with the ocean basin. what is the increase in the depth $...
6
votes
1answer
127 views

How to define the force at the base of an oceanic crust

In the book of Turcotte and Schubert, Geodynamics I'm trying to solve problem 2.8. The pressure in the water, in the oceanic crust, and in the mantle beneath the oceanic crust are (from equation 2.19,...
3
votes
0answers
66 views

What gravitational evidence do we have to counter the idea that oceans are formed when continents sink?

Is there some evidence for this based on gravity anomalies? I think I know how to tell if a mountain or structure is compensated based on bougeur and free air anomalies, but this really has me ...
1
vote
1answer
345 views

How can isostatic compensation of the crust be reconciled with a relatively strong upper mantle?

As I understand it, the outer portion of the Earth can be divided into the crust and mantle on chemical grounds (separated by the Moho), or into the lithosphere and asthenosphere based on mechanical ...
1
vote
0answers
16 views

Equations for Mantle Flow and Isostatic Rebound

In my Geomorphology book there is a section on uplift caused by isostatic rebound and it goes over how the viscoplastic nature of the mantle and the mechanically detached asthenosphere allow a long ...
1
vote
0answers
79 views

Why does the lithosphere thickness vary within a short distance?

Can someone explain why the lithosphere thickness varies within a short distance (30-100km) at the same upper mantle viscosity around the polar region? And what is the behaviour of a thin (20-70km) ...