Comparisons of uphole and downhole event seismograms and noise at RSCP and RSNT
In order to verify the proper operation and seismic fidelity of the RSTN stations RSCP and RSNT simultaneous recordings of the Nevada Test Site (NTS) seismic event CHANCELLOR were made uphole with surface seismographs and downhole with the RSNT sensors. The surface recordings at RSCP were made adjacent to the borehole using three component surface instruments (Kinemetrics SV-1, SH-1). The surface recordings at RSNT were obtained from element B4 of the Yellowknife Array. This element is located 1.5 km SW of the RSNT borehole. Comparison of the calibrated data in the 1-10 Hz band confirm that RSCP and RSNT are operating properly and recording seismic signals with fidelity. A large spike of 6 Hz vertical ground noise was found in the downhole data from RSNT. The distant uphole data did not show this noise nor did any of the Yellowknife Array stations. This 6 Hz vertical noise has P-P amplitudes of approximately 8 nm/sec and is large enough compared to the noise at 1-1.5 Hz to be a problem when using SP band data in that frequency range. Based on a comparison with RSSD where a similar noise spike (4.6 Hz) was found, it is likely that the RSTN site itself is the source of this noise. It is recommended that additional measurements be made at these sites to locate the source of this noise. 5 references, 15 figures.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6742306
- Report Number(s):
- UCID-20087; ON: DE84013107
- Country of Publication:
- United States
- Language:
- English
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