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USGS Professonal Paper 1096 - IRIS

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TEXAS--Continued<br />

GaFial'Hl, IX<br />

INSTRUMENTATION--Continued<br />

Code<br />

Typ'<br />

Seismometer<br />

Component<br />

Galvo'<br />

Tg(sec)<br />

Typ'<br />

recording<br />

Magnification<br />

otT o<br />

Remarks<br />

(GA-TX), (GL-TX),<br />

(GRITX), (GR2TX),<br />

(SA4TX) (2d oper.),<br />

(5 J-TX) (4th to Hh<br />

oper.) , (STI TX) ,<br />

ST2TX) :<br />

Geotech 5-13---- Z,NS,EW<br />

Geotech---------<br />

Z,NS,EW<br />

1.0<br />

20 .0<br />

--do-----:----<br />

--do---------<br />

SJ-TX: 80 K<br />

5TlTX: 350 K<br />

ST2TX: 300 K<br />

Do.<br />

Do.<br />

(WP-TX) : Geotech 31300--- Triaxial<br />

20.0<br />

--do---------<br />

Timing system: Geotech crystal clock checked with WWV (SO-msec tolerance).<br />

System response curves: See figure 3, p. 364.<br />

SHORT HISTORY<br />

The LRSM program began in 1960 as part of the VELA-Uniform project. It continued until 1971, when it was replaced by the<br />

Special Data Collection System program which remains active. Work under these programs has been directed towards advancing the<br />

seismic-detection, identification, and location techniques necessary to detect and identify underground nuclear explosions.<br />

All work is accomplished under the technical direction of AFTAC. Vela Seismic Center, in Alexandria, Va.<br />

306

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