Geophones are manufactured as either horizontal or vertical units. The
vertical ones have a little extra spring pull to support the moving coil
against gravity.  It is highly likely that these Geosource units are
vertical.

You can buy horizontal and vertical geophones.  Used ones are available
from R. T. Clark http://www.rtclark.com/ (inventory varies from time to
time). Horizontal geophones are often called "shear wave" geophones in
the oil patch.

For earthquake recording, don't even consider any with natural
frequencies higher than 5 Hz, and even those will only be good for local
events.

Doug

Casey Crane wrote:
> 
> Hi All,
> 
>         I was wondering if any could tell me if I can use a geophone
> in a horizontal configuration . www.gatewayelex.com has a unit made by
> GEOSOURCE.
> 
> Casey
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-- 
Doug Crice			 http://www.georadar.com
19623 Via Escuela Drive		      phone 408-867-3792
Saratoga, California  95070  USA	fax 408-867-4900
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