PSN-L Email List Message

Subject: Re: Recording earthquakes in a big cityhousing
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr@.........
Date: Tue, 19 Apr 2011 12:49:53 +0200


Hello Chris,

There is a basement. But I won't do anything with it. As I move to
Iceland in about one month time from now. But the move to K=F6ln is
planned in something about 4 to 5 years from now.

I also think that smaller towns just don't fit me as a person. But that
is just me and my experience.

I plan to use bicycle as my transport in K=F6ln when the time comes. I am
also going to use it as a transport in Icleand.

When I move to K=F6ln the plan is to get a apartment on the ground. I
don't have any desire to live in a block or many store houses. It
doesn't fit me due to satellite dishes that I want to set-up when I move
there.

I am using the geophones that Larry has been selling. The same type as I
have ever used.

Regards,
J=F3n Fr=EDmann.

On =FEri, 2011-04-19 at 06:21 -0400, Christopher Chapman wrote:
>=20
> J=F3n Fr=EDmann jonfr@.........
> Subject: Recording earthquakes in a big city
>=20
> Hello J=F3n,
>=20
> ***It might well be that the smaller towns don't fit my plans. As I am
> going to try avoding owning a car in Germany.
> The populations in the towns and cities are from 10.000 (Daun) and up to
> 1 million (K=F6ln).
> You are lucky. London is about 11 million and several UK towns=20
> are about 1 million!=20
> How about using a bicycle for transport in towns up to 30,000?=20
> Also, do check for any tram and bus services!
>=20
> ***But I want to know how it is to record a earthquakes in big towns. I a=
m
> currently living in Denmark, in S=F8nderborg. That town has a popluation
> close to 28.000 people. There is a lot of noise on my geophone. But I am
> up on the 3rd floor (2nd floor danish system). So the results that I am
> getting a bit noise because of this.
>=20
> Does anyone here have experience on how to record earthquakes in larger
> towns ? Is it possible to start with?
> In general it is usually quite possible, but maybe only well=20
> away from heavy industrial plant, particularly ones using large=20
> metal presses, rock crushing etc., but do expect the background=20
> noise levels to be quite high. Road traffic, particularly heavy=20
> lorries and goods trains generate quite a lot of noise, Uneven
> -ness in the road, potholes, manhole covers, rainwater drain=20
> grids can all interact with road traffic to generate pulse=20
> noise. A heavy lorry with several axles driving over a depressed=20
> drain or a pothole can generate a wave sequence which may look=20
> like a P wave. =20
> The factor which concerns me more is your 3rd floor location. =20
> Is there a bassement, or space on the ground floor for a geophone?=20
> There are usually vertical colums extending through all floors to=20
> carry water, drain pipes and electricity services. You may be able=20
> to use one of these for a geophone cable? Buildings are relatively=20
> light structures and react to wind noise, machinery and people=20
> noise. The basement, or the ground floor if there isn't one are=20
> likely to be the quietest locations.
> What sort of geophones are you using? I know that they are 4.5=20
> Hz, but are they a triaxial type or a single axis vertical?
> Regards,
> Chris Chapman
> =20
> =20
> =20
> =20
> =20
> =20
> =20
> =20
> This is likely=20
> =20
> =20


__________________________________________________________

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.

[ Top ] [ Back ] [ Home Page ]