Hi Dave,

I won't have the option getting the geophone to the ground. Also the
local animal live and insect live would be a problem.

But in theory a house should move in the same way as a earthquake does.
It is also a fact that Denmark doesn't have a lot of earthquakes. In
fact, I think that they mostly have close to zero earthquakes on land
and less then 10 earthquakes in one year off the coast.

Regards,
J=F3n Fr=EDmann.

On =FEri, 2011-01-25 at 14:05 +1100, dave.nelson@............... wrote:
> 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 m=
ail.  Rather you are recording the building's response to the quake which i=
s a whole different thing !!.=20
>     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 geoph=
one can be buried in the ground or at the very least securely affixed to th=
e concrete base (footpaths  etc) surrounding the building, if you cannot ge=
t to soil to bury the geophone. Its not going to be perfect but its going t=
o give you a much more "accurate" recording of the seismic waves  :)
>=20
> Dave
>=20
>=20
>=20
> > Jn Frmann  wrote:
> >=20
> Hi Dave,
>=20
> 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).
>=20
> Regards,
> Jn Frmann.
>=20
> On ri, 2011-01-25 at 07:20 +1100, Dave Nelson wrote:
> > The problem with elevating the seismometer is that the main thing you a=
re
> > recording is the buildings' response to the seismic waves rather than t=
he=20
> > seismic
> > waves themselves.
> >=20
> >    The further up in the building you are the more the building=20
> > sways,  even for distance events.
> >=20
> > Dave
> >=20
> >=20
> >=20
> >=20
> > 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 websi=
te,=20
> > >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 ever=
ything.
> > >You'll also find that the floor probably isnt solid enough to rest a=
=20
> > >seismometer on.     The weight of a human is enough to register full s=
cale=20
> > >deflection as the floor sags, when you move from one side of the room =
to=20
> > >the other.
> > >The best I could do is to lift the sensor box off the floor and press =
it=20
> > >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=
=20
> > >also see how much the building sways backward and forward through the=
=20
> > >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=
=20
> > >building than mine.
> > >
> > >
> > >
> > >
> > >Glenn
> > >
> > >__________________________________________________________
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of=20
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> >=20
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> >=20
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>=20
>=20
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>=20
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>=20
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>=20
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>=20
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