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 2nm/Hz/Hz (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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