Jon,
Dave is correct, you must have good contact with the ground (or at least =
the
floor) in order to get the optimal readings. Just standing on the legs =
is
not a good installation.

If you can unscrew the spikes (legs) then remove them. In that case, =
place
the geophone on the floor and put a 5 to 10kg sandbag on top of it. (An =
good
alternative would be to glue the geophone to the floor -- but that's
probably not acceptable.) Either sandbagging or gluing will give =
reasonably
good coupling and will minimize the chances of it getting bumped out of
place. The next best alternative is to use your plastic bucket. Bury the
geophone in dry sand in the bucket and place it in a out-of-the-way =
location
(remember to mark your north-south axis).
Regards,
-Tim-

Timothy Carpenter, P.E., Pres.
GeoDynamics Consultants, Inc.
5043 Whitlow Court
Commerce Township, Michigan 48382
248-363-4529 (Voice & Fax)
248-766-1629 (Cell)
geodynamics@........... (primary)
geodynamics@....... (secondary)

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of Dave Nelson
Sent: Saturday, January 06, 2007 5:11 PM
To: psn-l@..............
Subject: Re: Geophone with long legs

yes Jon

   it MUST be in good contact with the ground to record ground motion
properly.

    if it is just sitting on the floor of the house or as sounds like, =
on=20
legs above the floor
then most of anything it will record will be house/floor movement.

   if it must be brought closer to the house, then either bury it under =
the=20
house if there is underfloor access.  if ur house is on a concrete pad =
then=20
its going to have to go outside beside the house.
   Either way its still going to record a lot of building movement and=20
movement of people from within the house

cheers
Dave N
Sydney, Oz



At 01:19 PM 6/01/2007 +0000, you wrote:

>Hi all
>
>I am wondering, since I did move my geophone back inside, is the
>geophone less sensitive becose he now stands on the legs but is not
>surrounded in sand like when I did have him outside. Does it matter in
>the terms of detecting earthquakes ?
>
>Regards.
>--
>J=F3n Fr=EDmann
>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.
>
>
>--
>No virus found in this incoming message.
>Checked by AVG Free Edition.
>Version: 7.5.432 / Virus Database: 268.16.7/618 - Release Date: =
6/01/2007=20
>7:47 PM
>
>
>
>
>--
>No virus found in this incoming message.
>Checked by AVG Free Edition.
>Version: 7.5.432 / Virus Database: 268.16.7/618 - Release Date: =
6/01/2007=20
>7:47 PM



--=20
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.432 / Virus Database: 268.16.7/618 - Release Date: =
6/01/2007
7:47 PM


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)