Hi Louis,

I was wondering the same thing. I have had one of these sensors online since 1997. 
The FBA-23 is a strong motion sensor, mine has a +-2G range, that is designed to 
record large LOCAL events without saturating. Since you are in Tucson, AZ you will 
probably not record very many earthquakes with this type of sensor. What you need for 
your very nicely built vault is a long period sensor so you can record large events 
from all over the world.

Regards,
Larry Cochrane
Redwood City, PSN

On 10/19/2010 7:40 PM, Bob McClure wrote:
> What are you expecting to detect with the FBA-23 sensor? I think it is a
> triaxial accelerometer with plus/minus 1 g full scale range. I can hardly
> believe that it is any good for detecting anything other than a strong local
> event.
>
> Bob
>
> On Tue, Oct 19, 2010 at 12:33 AM, Louis Taber  wrote:
>
>>  Hi,
>>
>>  I just put up some pictures of my "seismic vault" on Facebook.  It is
>>  located in central Tucson, AZ.  So far the project has taken me about 4
>>  years of occasional effort.  Digging the original hole was most of the
>>  physical work.  The hole is about 5.5 feet deep.
>>
>>  http://www.facebook.com/album.php?aid=31424&id=100000335005655&l=81a5cef2df
>>
>>  The next step will be to start recording and processing the signal.
>>
>>    - Louis
>>
>
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