Apparently Jón wasn't all that incorrect when he said  "that three most 
active volcanoes in Iceland are heating up".
An article on MSNBC Scientist Identify Volcanic Trigger 
 today, says.... By studying 
volcanic magma, or molten rock, from erupted volcanoes they have 
determined that it heats itself up as it rises from deep below the 
surface -- which may provide an important trigger for an eruption. "As 
the magma ascends beneath the volcano prior to an eruption, it 
crystallizes in response to the drop in pressure and gets hotter at the 
same time,"


Geoffrey wrote:

> This is all quite interesting.
>
> However I do not understand how magma
> which has seperated from its source of
> energy deep inside the Earth can be "HEATING UP"
>
> It seems to me that from the time it begins
> its bouyant travels melting through the
> Earths Crust to reach the surface it
> will be cooling all the way.
>
> Maybe what you are saying here is that
> the magma chamber is expanding or
> something like that.
>
> I do, however, understand the meaning of
> increased activity.
>
>
> Regards;
> geoff
>
> ----- Original Message ----- From: "Jón Frímann" 
> To: "PSN-Postlist" 
> Sent: Thursday, August 31, 2006 12:58 PM
> Subject: Three most active volcanos in Iceland are heating up
>
>
>> Hi all
>>
>> According to Icelandic news it appeears that three most active volcanos
>> in Iceland are heating up. But that are Grimsvotn (Grimsfjall),
>> Myrdalsjokull, Hekla. Volcano named Bardarbunga is also starting to show
>> signs of incresed activite, but nothing conclusive yet. Helka has been
>> erupting every ten year since 1970, last eruption was in 2000.
>> Grimsfjall did last erupt in 2004. Myrdalsjokull last eruption was in
>> 1918. Bardarbunga did last erupt in 1903.
>>
>> When thease volcanos erupts I am problay going to see some of the
>> activie on my sensor, how much exacly is unkown to me. I am going to
>> record the eruption releated earthquakes for sure (above mag 2.8) when
>> the time comes.
>>
>> Regards.
>> -- 
>> Jón Frímann
>> http://www.jonfr.com
>> http://www.simnet.is/jonfr500/earthquake/
>>
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with
>> the body of the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>>
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with the body of 
> the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
>
>



  


Apparently Jón wasn't all that
incorrect when he said  "that three most active volcanoes in
Iceland are heating up". 

An article on MSNBC Scientist Identify
Volcanic Trigger today, says.... By
studying volcanic magma, or molten rock, from erupted volcanoes they
have determined that it heats itself up
as it rises from deep below the
surface — which may provide an important trigger for an eruption. “As
the magma ascends beneath the volcano prior to an eruption, it
crystallizes in response to the drop in pressure
and gets hotter at the
same time,”





Geoffrey wrote:
This is all quite interesting.
  

  

However I do not understand how magma
  

which has seperated from its source of
  

energy deep inside the Earth can be "HEATING UP"
  

  

It seems to me that from the time it begins
  

its bouyant travels melting through the
  

Earths Crust to reach the surface it
  

will be cooling all the way.
  

  

Maybe what you are saying here is that
  

the magma chamber is expanding or
  

something like that.
  

  

I do, however, understand the meaning of
  

increased activity.
  

  

  

Regards;
  

geoff
  

  

----- Original Message ----- From: "Jón Frímann"
<jonfr500@.........>
  

To: "PSN-Postlist" <PSN-L@..............>
  

Sent: Thursday, August 31, 2006 12:58 PM
  

Subject: Three most active volcanos in Iceland are heating up
  

  

  

  
Hi all
    

    

According to Icelandic news it appeears that three most active volcanos
    

in Iceland are heating up. But that are Grimsvotn (Grimsfjall),
    

Myrdalsjokull, Hekla. Volcano named Bardarbunga is also starting to
show
    

signs of incresed activite, but nothing conclusive yet. Helka has been
    

erupting every ten year since 1970, last eruption was in 2000.
    

Grimsfjall did last erupt in 2004. Myrdalsjokull last eruption was in
    

1918. Bardarbunga did last erupt in 1903.
    

    

When thease volcanos erupts I am problay going to see some of the
    

activie on my sensor, how much exacly is unkown to me. I am going to
    

record the eruption releated earthquakes for sure (above mag 2.8) when
    

the time comes.
    

    

Regards.
    

-- 

Jón Frímann
    

http://www.jonfr.com
    

http://www.simnet.is/jonfr500/earthquake/
    

    

__________________________________________________________
    

    

Public Seismic Network Mailing List (PSN-L)
    

    

To leave this list email PSN-L-REQUEST@.............. with
    

the body of the message (first line only): unsubscribe
    

See http://www.seismicnet.com/maillist.html for more information.
    

    

  
  

__________________________________________________________
  

  

Public Seismic Network Mailing List (PSN-L)
  

  

To leave this list email PSN-L-REQUEST@.............. with the body of
the message (first line only): unsubscribe
  

See http://www.seismicnet.com/maillist.html for more information.