USGS Professonal Paper 1096 - IRIS

MONTANA--Continued
Garland, IX
Timing system: Geotech crystal clock checked with WWV (50-msec tolerance).
System response curves: See figure 3, p. 364.
SHORT HISTORY
The ERSt! pLogtam began in 1969 as part of the VELA tJlliforlll pIOject. It coutinued until 1971, .. hen it .. as replaced hy the
Special Data Collection System program which remains active. Work under these programs has been directed towards advancing the
seismic-detection, identification, and location techniques necessary to detect and identify underground nuclear explosions.
All work is accompl i shed under the technical direction of AFTAC, Vela Seismic Center, in Alexandria, Va.
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