[ANSS-netops] Various STS-2 Installation Methods (NetOps VI Follow-up)

[Kyle Persefield]

All,

See attached.

This is a follow-up to the inquiries about the "Granite" 
Baseplate.  This is a comparison of various installation methods 
intended to improve the vertical LP noise to a level approaching that 
of a STS-1 vertical.

The granite baseplate does improve vertical LP noise performance ,but 
does not improve horizontal performance.  One of the features and one 
of our prime reasons for using the granite baseplate is environmental 
preservation of the sensor.

Sand installations are not recommended.  Sand actually decreased the 
LP noise performance of the STS-2 horizontals.  Different types of 
sand and wet sand was not evaluated.  Wet sand can't be a good 
thing.  Sand from a thermal perspective is good and dry sand could be 
use if it is contained without contacting the seismometer (in some outer ring).

The "Granite" baseplate has also be adapted for use with the Trillium 
240 and STS-2.5.

Drawings are available.

For a sure response send E-Mail to gsnmaint at usgs.gov, or 
gsn-xxxx(your station code)@usgs.gov

Regards,

Kyle E. Persefield
Honeywell Int'l HTSI, Field Engineer
USGS Albuquerque Seismological Laboratory Contractor

Observatory "Trouble" Hotline Telephone: 505-846-5646
Tel:   505-846-7597
Fax:  505-846-6973
http://earthquake.usgs.gov/regional/asl/

Mailing Address:
U S Geological Survey
Albuquerque Seismological Laboratory
P O Box 82010
Albuquerque, NM 87198-2010






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