In a message dated 2008/08/30, gel@................. writes:

> Ted,
> My thought would be to build a foundation as would need for a road, etc. I=
=20
> suggest 6=E2=80=9D of =C2=BE=E2=80=9D crushed rock.

Hi Gary,
      =20
       Don't include rock, pebbles, rebar, air bubbles in a base for a=20
seismometer system. The expansion coeffiecients don't match up and this gene=
rates=20
noise.

       Regards,

       Chris Chapman  =20
In a me=
ssage dated 2008/08/30, gel@................. writes:



Ted,

My thought would be to build a foundation as would need for a road, etc. I s=
uggest 6=E2=80=9D of =C2=BE=E2=80=9D crushed rock.




Hi Gary,

       

       Don't include rock, pebbles, rebar, air=
 bubbles in a base for a seismometer system. The expansion coeffiecients don=
't match up and this generates noise.



       Regards,



       Chris Chapman