redewenur
of
the link to the links I posted the first link is dated back to 2006 and is not relevant.
should you have read the second link which is current you can
read the alert levels.
scroll down to the summer months of 2008
then to the summer months of 2007
for an idea of the increase in volcanic activity durring the summer months.
most recent USGS alerts you might have noticed the RECENT volcanic activity decreases ie..
Yellowstone Lake Earthquake Swarm Summary through 5 January 2009, seismic activity has markedly decreased.
and click on the dec 2008 link !!
The images revealed temperatures as hot as 530 degrees Celsius on the N side of the dome and temperatures near 80 degrees Celsius on the W side. Temperatures had declined compared to thermal images taken in October 2008.
the fourth link is of the above web site
the fifth link Over the past month, seismic activity at Okmok volcano has continued to decrease and is now at or very near pre-eruption levels.
followed by links to other information.
What you're discussing is the very localised effect of melting ice that happens to be occurring directly above an active zone.
Im not disscussing local effects , you brought up iceland
and the effects of melting ice on iceland.
none the less if magma expands into rock then a portion of the magmas heat is given up as the magma expands , this release of heat lowers ( through heat transfer ) the surrounding magmas heat , and eventually decreases the temperature of the earths magma.
It's an interesting phenomenon, but that's all. It has nothing to do with the overall global level of volcanic activity.
Thats knid of like tossing a rock into a swimming pool , then saying , oh look the rock made a wave that effected the water just under the rock.
when the entire surface of the pool was effected by the wave.
What has everything to do with it is the heat generated by radioactivity
do you think that the pressure decrease under the earths ice
caps are like the rock thrown into the swimming pool?
or would you think that the decrease in pressure reaches all the way to the earths core -- where the heat is generated-?
and does pressure cause heat?
expecially if the heat is due to the friction between the
faster spinning core and the slower spinning magma !!!
And I'm sure it's occurred to you that the total mass/pressure of ice/water around the world remains constant.
yes ... IF THE EARTH WERE A LIQUID ...
but it happens that the earth is surrounded by crust.
and the crust is currently supporting and soaking up a whole lot of water that normaly would be in the oceans.
surely you can understand that !
As for temporary remission due to melting ice, I remind you that it would seem from your link to the list of links that the reverse is true in Iceland:
"Increase in volcanic activity is linked to ice melted by global warming" (
www.timesonline.co.uk, as above)
the
link you referenced is not relevant to this topic as it is dated back in april 2008 and 26 links down I might add !!!!!!!
however it does show what happens when ice melts.
and it shows what happens under the earths crust durring depressurization as the ice caps melt.
all in all it was a good link that described a current effect of depressurization.
