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  #1  
Old 8th June 2016, 03:30 PM
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atuanui atuanui is offline
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Default Earthquakes and Volcanoes

Does sea level rise cause earthquakes/volcanoes?
Isn't the sea pushing down on the tectonic plates?
I think I might have read this somewhere, but have forgotten.
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Old 8th June 2016, 03:40 PM
Spearthrower Spearthrower is offline
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Default Re: Earthquakes and Volcanoes

Quote:
atuanui said View Post
Does sea level rise cause earthquakes/volcanoes?
Isn't the sea pushing down on the tectonic plates?
I think I might have read this somewhere, but have forgotten.
No, sea levels are rising but the weight of water is not increasing by very much. Ice that was previously suspended in water, and thereby its weight was already included, is melting which increases the volume of liquid water.

Instead, it's the other way round. Ice on land, such as glaciers, depresses the crust it rests on, and when this melts and runs off, the crust rebounds very dynamically which could result in earthquakes and faults.
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Old 8th June 2016, 06:26 PM
stevebrooks stevebrooks is offline
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Default Re: Earthquakes and Volcanoes

Post glacial rebound is also extremely slow, much slower than one would expect, the earths crust is elastic, but it's still rock!

Interestingly enough in some areas post glacial rebound actually causes sea level rise (or more correctly land sinking as unevenly depressed plates regain more natural levels);

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In Great Britain, glaciation affected Scotland but not southern England, and the post-glacial rebound of northern Great Britain (up to 10 cm per century) is causing a corresponding downward movement of the southern half of the island (up to 5 cm per century). This will eventually lead to an increased risk of floods in southern England and south-western Ireland.
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Old 10th June 2016, 12:58 PM
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Darwinsbulldog Darwinsbulldog is offline
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Default Re: Earthquakes and Volcanoes

Perhaps the biggest worry is the Ice Cap on Antarctica. When it melts......
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