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Author Topic: Could surface temp affect the likelihood of earthquakes?  (Read 5131 times)

Offline geo driver

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just somthing in a drunken stupper the other night i though if the serface temp was really cold or because of the weight of ice for example, could that effect the way earthquakes happen.

its the only thing i can remember thinking that night
« Last Edit: 15/01/2010 09:29:39 by chris »


 

Offline Bass

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Re: Could surface temp affect the likelihood of earthquakes?
« Reply #1 on: 15/01/2010 06:07:21 »
Certainly weight of ice has an effect on the crust.  Surface temperatures, on the other hand, would not affect the depth that most earthquakes occur.
 

Offline Don_1

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Re: Could surface temp affect the likelihood of earthquakes?
« Reply #2 on: 15/01/2010 08:10:33 »
How deep does heat/cold penetrate the surface?
 

Offline Bass

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Could surface temp affect the likelihood of earthquakes?
« Reply #3 on: 16/01/2010 18:48:48 »
Generally on the order of 100 feet (30 meters), or less.  Permafrost has been noted up to several thousand feet (but no more than 5000') in Siberia.
 

Offline Bass

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Could surface temp affect the likelihood of earthquakes?
« Reply #4 on: 17/01/2010 01:05:27 »
So,

Would the speed of the waves travel faster or slower in ice, and what would be the consequences of the waves in ice "overrunning" or "underrunning" the waves in the earth?

Would the ice dampen the waves, or would the upper surface of the ice become the new "surface"?

What would happen at the glacier-earth interface?

Would the energy of the quake melt the ice??

Do we have any examples of these earthquakes "under glass"???  Alaska 1964?

Speed of seismic "P" waves, and most other seismic waves, is proportional to density.  Since ice less dense than (almost all) rock, seismic waves will slow down in ice.

Great question as to what happens to surface waves at the ice-rock boundary or on the ice surface.  Don't have a clue- but could make for some interesting research.

I doubt that the energy of earthquakes (most only last a few seconds) could melt the ice.

I'm sure the 1964 earthquake rattled some Alaskan glaciers- but I have never seen any research on seismic waves in glaciers.

« Last Edit: 17/01/2010 01:07:27 by Bass »
 

Offline geo driver

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Could surface temp affect the likelihood of earthquakes?
« Reply #5 on: 17/01/2010 05:47:12 »
due to the structure of the ice, would there be more absorption of the wavee / power of the quake meening that its less damaging?
 

Offline Bass

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Could surface temp affect the likelihood of earthquakes?
« Reply #6 on: 19/01/2010 17:14:58 »
That would be my guess, but I don't have any data to back that up.
 

Offline geo driver

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Could surface temp affect the likelihood of earthquakes?
« Reply #7 on: 19/01/2010 18:14:27 »
could be interesting. "im sorry" sais god "iv billions of tons of ice comming for the new ice age!" "but the good news is that earthquakes wont bother you as much." lol
 

Offline geo driver

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Could surface temp affect the likelihood of earthquakes?
« Reply #8 on: 19/01/2010 18:18:02 »
how would you test it? send a vibration though a sheet of ice and a piece of basalt and measure the movement at the other end?
 

Offline Bass

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Could surface temp affect the likelihood of earthquakes?
« Reply #9 on: 20/01/2010 03:05:50 »
placing seismometers on both glacial ice and nearby bedrock would seem the best way to compare
 

Offline geo driver

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Could surface temp affect the likelihood of earthquakes?
« Reply #10 on: 20/01/2010 21:30:23 »
but would that not meen that you just waiting around for an earthquake to perhaps happen?
 

Offline Bass

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Could surface temp affect the likelihood of earthquakes?
« Reply #11 on: 20/01/2010 23:34:10 »
Mid size to large earthquakes happen almost every day somewhere in the world.  Even though they may not be in close proximity, their seismic waves will still pass through both the ice and bedrock and can be analyzed by the seismometers.
 

Offline geo driver

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Could surface temp affect the likelihood of earthquakes?
« Reply #12 on: 22/01/2010 23:10:52 »
what is mid size to large?  excuse my ignorance but is 6.2 rictor über big ?
 

Offline Bass

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Could surface temp affect the likelihood of earthquakes?
« Reply #13 on: 25/01/2010 19:06:14 »
something like 4.0 to 6.9M, over 7.0 uber big.  Over 9.0 super uber big
 

Offline geo driver

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Could surface temp affect the likelihood of earthquakes?
« Reply #14 on: 26/01/2010 07:33:38 »
awesome cheers
 

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Could surface temp affect the likelihood of earthquakes?
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