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Bulletin of the Seismological Society of America; April 1987; v. 77; no. 2; p. 663-678
© 1987 Seismological Society of America
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System and site noise in the Regional Seismic Test Network from 0.1 to 20 Hz

PETER W. RODGERS, STEVEN R. TAYLOR and KEITH K. NAKANISHI

EARTH SCIENCES DIVISION LAWRENCE LIVERMORE NATIONAL LABORATORY UNIVERSITY OF CALIFORNIA, LIVERMORE, CALIFORNIA 94550

Abstract

The Regional Seismic Test Network (RSTN) consists of five broadband, three-component, telemetered seismic stations sited in North America in 100 m boreholes. Examination of both the system noise and the seismic site noise at these stations leads to the following conclusions

1. The vertical short-period band data are not degraded by quantizing noise, even at very low levels (<0.1 nm2/Hz, @1 Hz). This is also the case for midperiod band signals.
2. Aliasing in the short-period band causes significant distortion above 16 Hz.
3. For five noise samples, the vertical earth noise at 1 Hz at the RSTN stations range from 0.07 nm2/Hz (RSNT) to 1.8 nm2/Hz (RSNY), and the average displacement roll-off is Formula (proportional to f–2). Above 1 Hz RSCP is the noisiest and RSNT the quietest station.
4. At RSNT during quiet times, some of the observed noise may be due to the vertical component S-750 seismometer.

It is our conclusion that there is no significant system contamination of regional seismic data recorded by the RSTN and that it records these data with good fidelity.




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