Hi Jon,
              I suggest that its going to be a significant problem as you are no longer really recording the earthquake. As I said in the previous mail.  Rather you are recording the building's response to the quake which is a whole different thing !!. 
    If it was me I would be doing all I could,once you have relocated to that building to try and get a cable down to ground level so that the geophone can be buried in the ground or at the very least securely affixed to the concrete base (footpaths  etc) surrounding the building, if you cannot get to soil to bury the geophone. Its not going to be perfect but its going to give you a much more "accurate" recording of the seismic waves  :)

Dave



> Jón Frímann  wrote:
> 
Hi Dave,

I know, and this is why that I did ask about if this would be a problem.
It appears that it won't be a problem. But there is a question how well
this is going to work in Denmark, as houses there are build from bricks
like in most other places in Europe (far as I know anyway).

Regards,
Jón Frímann.

On ţri, 2011-01-25 at 07:20 +1100, Dave Nelson wrote:
> The problem with elevating the seismometer is that the main thing you are
> recording is the buildings' response to the seismic waves rather than the 
> seismic
> waves themselves.
> 
>    The further up in the building you are the more the building 
> sways,  even for distance events.
> 
> Dave
> 
> 
> 
> 
> At 06:43 AM 25/01/2011, you wrote:
> >I'm on the third floor, and as you can see by the pictures on my website, 
> >the result is that you'll see all the big earthquakes easily.
> >
> >http://www.brasswings.com/seis.html
> >
> >But of course there is a huge amount of background noise.
> >Wind is the biggest issue.   Windy days can block out pretty much everything.
> >You'll also find that the floor probably isnt solid enough to rest a 
> >seismometer on.     The weight of a human is enough to register full scale 
> >deflection as the floor sags, when you move from one side of the room to 
> >the other.
> >The best I could do is to lift the sensor box off the floor and press it 
> >up against the wall (in a corner) with the weight of some bricks.
> >If you've got the ability to measure it (with an inclinometer), you'll 
> >also see how much the building sways backward and forward through the 
> >course of the day and it heats up and cools down.
> >
> >But as you say, its worth a try anyway.   You might have a more solid 
> >building than mine.
> >
> >
> >
> >
> >Glenn
> >
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