Seismic Network Operations

IU OTAV

Otavalo, Ecuador

IU OTAV commences operations on: 2000,251

Country Flag
Host: Escuela Politecnica Nacional
Latitude: 0.238
Longitude: -78.451
Elevation: 3510
Datalogger: Q330
Broadband: STS-1VBB_w/E300
Accelerometer: FBA_ES-T_EpiSensor_Accelerometer
Telemetry Status at the NEIC: No Data In More Than 24 Hours
Station Photo Station Photo Station Photo 

Vault Condition: Tunnel into the side of a mountain.

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
20HNZFBA ES-T EpiSensor AccelerometerTG100.00-90.000.0015.00
20HN2FBA ES-T EpiSensor AccelerometerTG100.000.0090.0015.00
20HN1FBA ES-T EpiSensor AccelerometerTG100.000.000.0015.00
10HHZSTS-2 High-gainTG100.00-90.000.0015.00
10HH2STS-2 High-gainTG100.000.0090.0015.00
10HH1STS-2 High-gainTG100.000.000.0015.00
30LDOIU Paroscientific MicrobarographCW1.000.000.0015.00
20LNZFBA ES-T EpiSensor AccelerometerCG1.00-90.000.0015.00
20LN2FBA ES-T EpiSensor AccelerometerCG1.000.0090.0015.00
20LN1FBA ES-T EpiSensor AccelerometerCG1.000.000.0015.00
10VHZSTS-2 High-gainCG0.10-90.000.0015.00
10VH2STS-2 High-gainCG0.100.0090.0015.00
10VH1STS-2 High-gainCG0.100.000.0015.00
10LHZSTS-2 High-gainCG1.00-90.000.0015.00
10LH2STS-2 High-gainCG1.000.0090.0015.00
10LH1STS-2 High-gainCG1.000.000.0015.00
10BHZSTS-2 High-gainCG40.00-90.000.0015.00
10BH2STS-2 High-gainCG40.000.0090.0015.00
10BH1STS-2 High-gainCG40.000.000.0015.00
00VHZSTS-1VBB w/E300CG0.10-90.000.0015.00
00VH2STS-1VBB w/E300CG0.100.0090.0015.00
00VH1STS-1VBB w/E300CG0.100.000.0015.00
00LHZSTS-1VBB w/E300CG1.00-90.000.0015.00
00LH2STS-1VBB w/E300CG1.000.0090.0015.00
00LH1STS-1VBB w/E300CG1.000.000.0015.00
00BHZSTS-1VBB w/E300CG20.00-90.000.0015.00
00BH2STS-1VBB w/E300CG20.000.0090.0015.00
00BH1STS-1VBB w/E300CG20.000.000.0015.00
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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
00BHZ2012:125 2010:136 to No Ending TiA0.0594240.012180.330690.17709 STS1VBBE3Random
00BH22012:125 2010:136 to No Ending TiA0.0353570.00749170.230530.28094 STS1VBBE3Random
00BH12012:125 2010:136 to No Ending TiA0.151020.0134570.718810.47135 STS1VBBE3Random
  1. Current Issues
    STS-1 N-S LP pulsing present.
  2. 2013-03-17
    Accelerometer replaced.
  3. 2012-06-28
    E300 cables were replaced to address over damped long period response.
  4. 2009-04-06
    Upgraded to Q330 digitizer.