Seismic Network Operations

IU QSPA

South Pole Remote Earth Science Observatory (Quiet Zone)

IU QSPA commences operations on: 2002,363

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Host: US National Science Foundation
Latitude: -89.929
Longitude: 144.438
Elevation: 2850
Datalogger: Q330
Broadband: KS-54000
Accelerometer: n/a
Telemetry Status at the NEIC: Last Data In Less Than 10 Minutes
Station Photo Station Photo Station Photo Station Photo 

Site Description: Site is located 8km from the geographic south pole and sits on a glacier ~2.5km thick.

Vault Condition: Surface instruments are in a 8ft diameter cylindrical vault with the floor of the vault ~4 m below the surface of the snow. Borehole instruments are in ~12 diameter holes at depths of 275m (KS54000) and 255m (Guralp). Boreholes are dry and not cased and are in solid ice. Boreholes will slowly collapse, but the strength of the downhole instruments are designed to withstand the hydrostatic load.

Site Geology: Surface instruments are in consolidated firn (sintered, relatively stiff snow) and borehole instruments are in solid blue ice.

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
85HHZGeotech GS-13 SeismometerCG100.00-90.000.00250.00
80VMZStreckeisen STS-1V/VBB SeismometerCH0.100.000.003.00
80VHZStreckeisen STS-1V/VBB SeismometerCG0.10-90.000.003.00
80LHZStreckeisen STS-1V/VBB SeismometerCG1.00-90.000.003.00
80HHZStreckeisen STS-1V/VBB SeismometerTG100.00-90.000.003.00
80BHZStreckeisen STS-1VBB w/E300CG20.00-90.000.003.00
70VMZGuralp CMG3-T Seismometer (borehole)CH0.100.000.00146.00
70VM2Guralp CMG3-T Seismometer (borehole)CH0.100.000.00146.00
70VM1Guralp CMG3-T Seismometer (borehole)CH0.100.000.00146.00
70VHZGuralp CMG3-T Seismometer (borehole)CG0.10-90.000.00146.30
70LHZGuralp CMG3-T Seismometer (borehole)CG1.00-90.000.00146.30
70HHZGuralp CMG3-T Seismometer (borehole)TG100.00-90.000.00146.30
70BHZGuralp CMG3-T Seismometer (borehole)CG40.00-90.000.00146.30
60VMWStreckeisen STS-2.5CH0.100.000.003.00
60VMVStreckeisen STS-2.5CH0.100.000.003.00
60VMUStreckeisen STS-2.5CH0.100.000.003.00
60VHZStreckeisen STS-2.5CG0.10-90.000.003.00
60LHZStreckeisen STS-2.5CG1.00-90.000.003.00
60HHZStreckeisen STS-2.5TG100.00-90.000.003.00
60BHZStreckeisen STS-2.5CG40.00-90.000.003.00
50LWSRM Young 5603B Wind Speed IndicatorCG1.000.000.000.00
40LFZCrossbow Technology 3-axis fluxgate magnetometerCG1.00-90.000.002.00
31LDOCI/PAS pressure sensorCW1.000.000.000.00
30LDOlower quality chip sensor in Setra boxCW1.000.000.000.00
10VMZGuralp CMG3-T Seismometer (borehole)CH0.100.000.00245.00
10VM2Guralp CMG3-T Seismometer (borehole)CH0.100.000.00245.00
10VM1Guralp CMG3-T Seismometer (borehole)CH0.100.000.00245.00
10VHZGuralp CMG3-T Seismometer (borehole)CG0.10-90.000.00254.00
10LHZGuralp CMG3-T Seismometer (borehole)CG1.00-90.000.00254.00
10HHZGuralp CMG3-T Seismometer (borehole)TG100.00-90.000.00254.00
10BHZGuralp CMG3-T Seismometer (borehole)CG40.00-90.000.00254.00
00VMZGeotech KS-54000 Borehole SeismometerCH0.100.000.00270.00
00VM2Geotech KS-54000 Borehole SeismometerCH0.100.000.00270.00
00VM1Geotech KS-54000 Borehole SeismometerCH0.100.000.00270.00
00VHZGeotech KS-54000 Borehole SeismometerCG0.10-90.000.00270.00
00LHZGeotech KS-54000 Borehole SeismometerCG1.00-90.000.00270.00
00BHZGeotech KS-54000 Borehole SeismometerCG20.00-90.000.00270.00
10VH2Guralp CMG3-T Seismometer (borehole)CG0.100.0045.00254.00
10LH2Guralp CMG3-T Seismometer (borehole)CG1.000.0045.00254.00
10HH2Guralp CMG3-T Seismometer (borehole)TG100.000.0045.00254.00
10BH2Guralp CMG3-T Seismometer (borehole)CG40.000.0045.00254.00
70VH2Guralp CMG3-T Seismometer (borehole)CG0.100.0079.00146.30
70LH2Guralp CMG3-T Seismometer (borehole)CG1.000.0079.00146.30
70HH2Guralp CMG3-T Seismometer (borehole)TG100.000.0079.00146.30
70BH2Guralp CMG3-T Seismometer (borehole)CG40.000.0079.00146.30
00VH1Geotech KS-54000 Borehole SeismometerCG0.100.00176.00270.00
00LH1Geotech KS-54000 Borehole SeismometerCG1.000.00176.00270.00
00BH1Geotech KS-54000 Borehole SeismometerCG20.000.00176.00270.00
40LF1Crossbow Technology 3-axis fluxgate magnetometerCG1.000.00215.002.00
60VH1Streckeisen STS-2.5CG0.100.00221.003.00
60LH1Streckeisen STS-2.5CG1.000.00221.003.00
60HH1Streckeisen STS-2.5TG100.000.00221.003.00
60BH1Streckeisen STS-2.5CG40.000.00221.003.00
00VH2Geotech KS-54000 Borehole SeismometerCG0.100.00266.00270.00
00LH2Geotech KS-54000 Borehole SeismometerCG1.000.00266.00270.00
00BH2Geotech KS-54000 Borehole SeismometerCG20.000.00266.00270.00
40LF2Crossbow Technology 3-axis fluxgate magnetometerCG1.000.00305.002.00
60VH2Streckeisen STS-2.5CG0.100.00311.003.00
60LH2Streckeisen STS-2.5CG1.000.00311.003.00
60HH2Streckeisen STS-2.5TG100.000.00311.003.00
60BH2Streckeisen STS-2.5CG40.000.00311.003.00
10VH1Guralp CMG3-T Seismometer (borehole)CG0.100.00315.00254.00
10LH1Guralp CMG3-T Seismometer (borehole)CG1.000.00315.00254.00
10HH1Guralp CMG3-T Seismometer (borehole)TG100.000.00315.00254.00
10BH1Guralp CMG3-T Seismometer (borehole)CG40.000.00315.00254.00
70VH1Guralp CMG3-T Seismometer (borehole)CG0.100.00349.00146.30
70LH1Guralp CMG3-T Seismometer (borehole)CG1.000.00349.00146.30
70HH1Guralp CMG3-T Seismometer (borehole)TG100.000.00349.00146.30
70BH1Guralp CMG3-T Seismometer (borehole)CG40.000.00349.00146.30
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As part of the annual calibration process, the USGS runs a sequence that includes a random, a step, and several sine wave calibrations.  The USGS analyzes the random binary calibration signal in order to estimate the instrument response.  The figures below show the results from the analysis of the most recent processed calibration at the station.

We use an iterative three-step method to estimate instrument response parameters (poles, zeros, sensitivity and gain) and their associated errors using random calibration signals. First, we solve a coarse non-linear inverse problem using a least squares grid search to yield a first approximation to the solution. This approach reduces the likelihood of poorly estimated parameters (a local-minimum solution) caused by noise in the calibration records and enhances algorithm convergence. Second, we iteratively solve a non-linear parameter estimation problem to obtain the least squares best-fit Laplace pole/zero/gain model. Third, by applying the central limit theorem we estimate the errors in this pole/zero model by solving the inverse problem at each frequency in a 2/3rds-octave band centered at each best-fit pole/zero frequency. This procedure yields error estimates of the 99% confidence interval.

LocChanCal DateEpoch-SpanGradeAmp Nominal Error (dB)Amp Best Fit Error (dB)Phase Nominal Error (degree)Phase Best Fit Error (degree)SensorCal Type
70BH12013:2582011:018 to No Ending TimeA0.820170.0121054.69512.7717CMG3-T-BRandom
70BH22013:2582011:018 to No Ending TimeA0.822490.0121034.71142.7776CMG3-T-BRandom
70BHZ2013:2582011:018 to No Ending TimeA0.82840.0119524.70742.8219CMG3-T-BRandom
  1. 2013-01-25
    The STS-2.5 (location code 60) was replaced to remedy high noise on the horizontal components.
  2. 2011-01-26
    Upgraded to Q330 digitizer.