Hi Jon What are you going to do in Denmark? Did you get a job there? Good wishes for an smooth move! Pete --- On Mon, 1/24/11, J=F3n Fr=EDmannwrote: From: J=F3n Fr=EDmann Subject: Re: Recording earthquakes from 3rd floor To: psnlist@.............. Date: Monday, January 24, 2011, 7:21 PM 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, >=A0 =A0 =A0 =A0 =A0 =A0 =A0=A0=A0I suggest that its going to be a signific= ant problem as you are no longer really recording the earthquake. As I said= in the previous mail.=A0 Rather you are recording the building's response = to the quake which is a whole different thing !!.=20 >=A0 =A0=A0=A0If it was me I would be doing all I could,once you have reloc= ated to that building to try and get a cable down to ground level so that t= he geophone can be buried in the ground or at the very least securely affix= ed to the concrete base (footpaths=A0 etc) surrounding the building, if you= cannot get to soil to bury the geophone. Its not going to be perfect but i= ts going to give you a much more "accurate" recording of the seismic waves= =A0 :) >=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 > >=A0 =A0 The further up in the building you are the more the building=20 > > sways,=A0 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.=A0=A0=A0Windy days can block out pretty muc= h everything. > > >You'll also find that the floor probably isnt solid enough to rest a= =20 > > >seismometer on.=A0 =A0=A0=A0The weight of a human is enough to registe= r full scale=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.=A0=A0=A0You might have a more = solid=20 > > >building than mine. > > > > > > > > > > > > > > >Glenn > > > > > >__________________________________________________________ > > > > > >Public Seismic Network Mailing List (PSNLIST) > > > > > >To leave this list email PSNLIST-REQUEST@.............. with the body = of=20 > > >the message (first line only): unsubscribe > > >See http://www.seismicnet.com/maillist.html for more information. > >=20 > > __________________________________________________________ > >=20 > > Public Seismic Network Mailing List (PSNLIST) > >=20 > > To leave this list email PSNLIST-REQUEST@.............. with=20 > > the body of the message (first line only): unsubscribe > > See http://www.seismicnet.com/maillist.html for more information. >=20 >=20 > __________________________________________________________ >=20 > Public Seismic Network Mailing List (PSNLIST) >=20 > To leave this list email PSNLIST-REQUEST@.............. with=20 > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ >=20 > Public Seismic Network Mailing List (PSNLIST) >=20 > To leave this list email PSNLIST-REQUEST@.............. with=20 > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSNLIST) To leave this list email PSNLIST-REQUEST@.............. with the body of the message (first line only): unsubscribe See http://www.seismicnet.com/maillist.html for more information.
Hi Jon
What are you going to do in Denmark= ? Did you get a job there?
Good wishes for an smooth move!
Pete
--- On Mon, 1/24/11, J=F3n Fr=EDmann <jonfr@.........> wrote:
From: J=F3n Fr=EDmann <jonfr@jo= nfr.com>
Subject: Re: Recording earthquakes from 3rd floor
To: ps= nlist@..............
Date: Monday, January 24, 2011, 7:21 PMHi Dave,=
I won't have the option getting the ge= ophone to the ground. Also the
local animal live and insect live would b= e 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 ea= rthquakes. In
fact, I think that they mostly have close to zero earthqua= kes on land
and less then 10 earthquakes in one year off the coast.
Reg= ards,
J=F3n Fr=EDmann.
On =FEri, 2011-01-25 at 14:05 +1100, dave.nelson@............... wrote:
> Hi J= on,
> I su= ggest that its going to be a significant problem as you are no longer reall= y recording the earthquake. As I said in the previous mail. Rather yo= u are recording the building's response to the quake which is a whole diffe= rent thing !!.
> If it was me I would be doi= ng all I could,once you have relocated to that building to try and get a ca= ble down to ground level so that the geophone can be buried in the ground o= r 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 mor= e "accurate" recording of the seismic waves :)
>
> Dave<= br>>
>
>
> > Jn Frmann <jonfr@.........<= /a>> wrote:
> >
> Hi Dave,
>
> I know, and = this is why that I did ask about if this would be a problem.
> It app= ears that it won't be a problem. But there is a question how well
> t= his is going to work in Denmark, as houses there are build from bricks
&= gt; like in most other places in Europe (far as I know anyway).
>
> Regards,
> Jn Frmann.
>
> On ri, 2011-01-25 at 07:= 20 +1100, Dave Nelson wrote:
> > The problem with elevating the se= ismometer is that the main thing you are
> > recording is the buil= dings' response to the seismic waves rather than the
> > seismic
> > waves themselves.
> >
> > &n= bsp; 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
> > >
> > &g= t;But of course there is a huge amount of background noise.
> > &g= t;Wind is the biggest issue. Windy days can block out pret= ty much everything.
> > >You'll also find that the floor probab= ly isnt solid enough to rest a
> > >seismometer on. The weight of a human is enough to register full scale <= br>> > >deflection as the floor sags, when you move from one side = of the room to
> > >the other.
> > >The best I cou= ld do is to lift the sensor box off the floor and press it
> > &g= t;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), y= ou'll
> > >also see how much the building sways backward and f= orward 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
> > >
> > >= __________________________________________________________
> > >
> > >Public Seismic Network Mailing List (PSNLIST)> > >
> > >To leave this list email PSNLIST-REQUEST@.............. with the body of
= > > >the message (first line only): unsubscribe
> > >S= ee ht= tp://www.seismicnet.com/maillist.html for more information.
> >= ;
> > __________________________________________________________<= br>> >
> > Public Seismic Network Mailing List (PSNLIST)
> >
> > To leave this list email PSNLIST-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 (PSNLIST)
>
> T= o leave this list email PSNLIST-REQUEST@= SEISMICNET.COM with
> the body of the message (first line only):= unsubscribe
> See http://www.seismicnet.com/maillist.html for more in= formation.
> ________________________________________________________= __
>
> Public Seismic Network Mailing List (PSNLIST)
> <= br>> To leave this list email PSNLIST-REQUEST@S= EISMICNET.COM with
> the body of the message (first line only): = unsubscribe
> See http://www.seismicnet.com/maillist.html for more inf= ormation.
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