[ANSS-netops] Vaults and ARRA upgrade stations

[David S. Croker]

Hi Nathan,

There seems to be a commonality between many networks these days to 
use some sort of cylindrical vault like the overpack waste storage 
barrels (like Mark described) or the fiberglass that Bob 
mentioned.  Memphis uses some rather large culverts I think.  The TA 
uses slightly smaller culverts. The size and depth depend largely on 
the conditions at the site.  If you can hit bedrock in the first few 
feet, you don't need a very large vault.  However, the sensors need 
sufficient insulation and need to be separated from surface noise 
like wind so they can't be too small.  We at the NCSN use the waste 
barrels similar to Mark and try to find a location where a 3ft tall 
one will fit.  The guys at Berkeley buy a 8ft x 20ft (?) shipping 
container and dig out the side of a hill and plant it in there then 
cover it up.

The crew at ASL have installed and tested several different flavors 
of vault.  I wouldn't be surprised if Kyle and Bob Hutt have written 
Open File Reports on the performance of each.  From what I can see, 
the real-world differences in vault design are not very significant 
unless you compare temporary surface installations to barrel-type to 
tunnel/adit installations.  Of course a lot depends on the 
performance of the broadband sensor you plan to install.  If you have 
a STS-1-class instrument you'll want an overbuilt quiet site.

Dave



At 09:07 AM 4/13/2010, Nathan L Edwards wrote:
>We were wondering what other networks are doing in regards to the 
>construction of new vaults, broadband in particular.  Maybe 
>something along the lines of one that Mark Meremonte covered in this 
>presentation?
>
>http://earthquake.usgs.gov/research/monitoring/anss/internal/ppt/vaultDesigns02.ppt
>
>
>
>Nathan Edwards
>Development Technician
>Nevada Seismological Laboratory
>University of Nevada Reno
>Reno, NV 89557-0174
>o:  775-784-1106
>m:  775-303-5899
>f:  775-784-4165
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