Seismic Network Operations

IU LVC

Limon Verde, Chile

IU LVC commences operations on: 1996,337

Country Flag
Host: University of Chile
Latitude: -22.613
Longitude: -68.911
Elevation: 2960
Datalogger: Q330
Broadband: STS-1H/VBB
Accelerometer: FBA_ES-T_EpiSensor_Accelerometer
Telemetry Status at the NEIC: Last Data In Less Than 10 Minutes
Station Photo Station Photo Station Photo 

Vault Condition: concrete pier

Site Geology: highly folded highly metamorphosed ultramafic rock

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
00VHZSTS-1H/VBBCG0.10-90.000.0030.00
00VH2STS-1H/VBBCG0.100.0090.0030.00
00VH1STS-1H/VBBCG0.100.000.0030.00
00LHZSTS-1H/VBBCG1.00-90.000.0030.00
00LH2STS-1H/VBBCG1.000.0090.0030.00
00LH1STS-1H/VBBCG1.000.000.0030.00
00BHZSTS-1H/VBBCG20.00-90.000.0030.00
00BH2STS-1H/VBBCG20.000.0090.0030.00
00BH1STS-1H/VBBCG20.000.000.0030.00
10VHZCMG3-TCG0.10-90.000.0030.00
10VH2CMG3-TCG0.100.0091.0030.00
10VH1CMG3-TCG0.100.001.0030.00
10LHZCMG3-TCG1.00-90.000.0030.00
10LH2CMG3-TCG1.000.0091.0030.00
10LH1CMG3-TCG1.000.001.0030.00
10HHZCMG3-TTG100.00-90.000.0030.00
10HH2CMG3-TTG100.000.0091.0030.00
10HH1CMG3-TTG100.000.001.0030.00
10BHZCMG3-TCG40.00-90.000.0030.00
10BH2CMG3-TCG40.000.0091.0030.00
10BH1CMG3-TCG40.000.001.0030.00
20LNZFBA ES-T EpiSensor AccelerometerCG1.00-90.000.0030.00
20LN2FBA ES-T EpiSensor AccelerometerCG1.000.0090.0030.00
20LN1FBA ES-T EpiSensor AccelerometerCG1.000.000.0030.00
20HNZFBA ES-T EpiSensor AccelerometerTG100.00-90.000.0030.00
20HN2FBA ES-T EpiSensor AccelerometerTG100.000.0090.0030.00
20HN1FBA ES-T EpiSensor AccelerometerTG100.000.000.0030.00
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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
10BH22011:008 2009:100 to No Ending TA0.010770.0105670.108080.078229 CMG3-TRandom
10BHZ2011:008 2009:100 to No Ending TA0.023310.010750.0798630.165 CMG3-TRandom
10BH12011:008 2009:100 to No Ending TA0.012430.0116690.113290.093807 CMG3-TRandom
00BH22011:007 2009:100 to No Ending TA0.0121640.00989580.0957350.11269 STS1HVBBRandom
00BHZ2011:007 2009:100 to No Ending TA0.0113920.00951570.0907560.1124 STS1HVBBRandom
00BH12011:007 2009:100 to No Ending TA0.0115460.00961790.0925880.11923 STS1HVBBRandom
  1. 2012-12-12
    Upgraded to E300 electronics for STS-1. Resolved STS-1 vertical noise problem.
  2. 2012-12-01
    The solar panels were stolen at the beginning of December 2011.
  3. 2012-08-09
    Replacement solar panels installed.
  4. 2011-04-19
    VSAT repaired after Feb. 2011 failure.
  5. 2009-04-14
    Upgraded to Q330 digitizer.