Seismic Network Operations


Waverly, Tennessee, USA

IU WVT commences operations on: 1997,106

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Host: St. Louis University
Latitude: 36.13
Longitude: -87.83
Elevation: 170
Datalogger: Q330
Broadband: STS-1VBB_w/E300
Accelerometer: FBA_ES-T_EpiSensor_Accelerometer
Telemetry Status at the NEIC: Last Data In Less Than 10 Minutes
Station Photo Station Photo Station Photo 
Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
30LDOCI/PAS pressure sensorCW1.
20LNZFBA ES-T EpiSensor AccelerometerCG1.00-
20LN2FBA ES-T EpiSensor AccelerometerCG1.000.0090.000.00
20LN1FBA ES-T EpiSensor AccelerometerCG1.
20HNZFBA ES-T EpiSensor AccelerometerTG100.00-
20HN2FBA ES-T EpiSensor AccelerometerTG100.000.0090.000.00
20HN1FBA ES-T EpiSensor AccelerometerTG100.
00VHZSTS-1VBB w/E300CG0.10-
00VH2STS-1VBB w/E300CG0.100.0090.000.00
00VH1STS-1VBB w/E300CG0.
00LHZSTS-1VBB w/E300CG1.00-
00LH2STS-1VBB w/E300CG1.000.0090.000.00
00LH1STS-1VBB w/E300CG1.
00BHZSTS-1VBB w/E300CG20.00-
00BH2STS-1VBB w/E300CG20.000.0090.000.00
00BH1STS-1VBB w/E300CG20.
10LHZSTS-2 Standard-gainCG1.00-
10BHZSTS-2 Standard-gainCG40.00-
10LH2STS-2 Standard-gainCG1.000.0090.000.00
10LH1STS-2 Standard-gainCG1.
10HHZSTS-2 Standard-gainTG100.00-
10VHZSTS-2 Standard-gainCG0.10-
10VH2STS-2 Standard-gainCG0.100.0090.000.00
10HH2STS-2 Standard-gainTG100.000.0090.000.00
10HH1STS-2 Standard-gainTG100.
10VH1STS-2 Standard-gainCG0.
10BH2STS-2 Standard-gainCG40.000.0090.000.00
10BH1STS-2 Standard-gainCG40.
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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
00BH22012:169 2011:023 to No Ending TA0.0190070.00900980.128550.18064 STS1VBBE3Random
00BHZ2012:169 2011:062 to No Ending TA0.0229140.0095690.138440.13734 STS1VBBE3Random
10BHZ2011:026 2011:023 to No Ending TA0.0124880.0126840.0697350.070987 STS-2-SGRandom
00BH12012:169 2011:023 to No Ending TA0.0238910.0123010.141550.14325 STS1VBBE3Random
  1. Current Issues
    The STS-1 vertical has intermittent high LP noise.
  2. 2012-06-16
    Episensor replaced due to noise issues.
  3. 2011-01-23
    Upgraded to Q330 digitizer.