Seismic Network Operations
IU OTAV
Otavalo, Ecuador
IU OTAV commences operations on: 2000,251
| 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: |
 Last Data In Less Than 10 Minutes |
Vault Condition: Tunnel into the side of a mountain.
| Location Code | Channel Code | Instrument | Flags | Sample Rate | Dip | Azimuth | Depth |
|---|---|---|---|---|---|---|---|
| 10 | VHZ | STS-2 High-gain | CG | 0.10 | -90.00 | 0.00 | 15.00 |
| 10 | VH2 | STS-2 High-gain | CG | 0.10 | 0.00 | 90.00 | 15.00 |
| 10 | VH1 | STS-2 High-gain | CG | 0.10 | 0.00 | 0.00 | 15.00 |
| 00 | VHZ | STS-1VBB w/E300 | CG | 0.10 | -90.00 | 0.00 | 15.00 |
| 00 | VH2 | STS-1VBB w/E300 | CG | 0.10 | 0.00 | 90.00 | 15.00 |
| 00 | VH1 | STS-1VBB w/E300 | CG | 0.10 | 0.00 | 0.00 | 15.00 |
| 30 | LDO | IU Paroscientific Microbarograph | CW | 1.00 | 0.00 | 0.00 | 15.00 |
| 20 | LNZ | FBA ES-T EpiSensor Accelerometer | CG | 1.00 | -90.00 | 0.00 | 15.00 |
| 20 | LN2 | FBA ES-T EpiSensor Accelerometer | CG | 1.00 | 0.00 | 90.00 | 15.00 |
| 20 | LN1 | FBA ES-T EpiSensor Accelerometer | CG | 1.00 | 0.00 | 0.00 | 15.00 |
| 10 | LHZ | STS-2 High-gain | CG | 1.00 | -90.00 | 0.00 | 15.00 |
| 10 | LH2 | STS-2 High-gain | CG | 1.00 | 0.00 | 90.00 | 15.00 |
| 10 | LH1 | STS-2 High-gain | CG | 1.00 | 0.00 | 0.00 | 15.00 |
| 00 | LHZ | STS-1VBB w/E300 | CG | 1.00 | -90.00 | 0.00 | 15.00 |
| 00 | LH2 | STS-1VBB w/E300 | CG | 1.00 | 0.00 | 90.00 | 15.00 |
| 00 | LH1 | STS-1VBB w/E300 | CG | 1.00 | 0.00 | 0.00 | 15.00 |
| 20 | HNZ | FBA ES-T EpiSensor Accelerometer | TG | 100.00 | -90.00 | 0.00 | 15.00 |
| 20 | HN2 | FBA ES-T EpiSensor Accelerometer | TG | 100.00 | 0.00 | 90.00 | 15.00 |
| 20 | HN1 | FBA ES-T EpiSensor Accelerometer | TG | 100.00 | 0.00 | 0.00 | 15.00 |
| 10 | HHZ | STS-2 High-gain | TG | 100.00 | -90.00 | 0.00 | 15.00 |
| 10 | HH2 | STS-2 High-gain | TG | 100.00 | 0.00 | 90.00 | 15.00 |
| 10 | HH1 | STS-2 High-gain | TG | 100.00 | 0.00 | 0.00 | 15.00 |
| 00 | BHZ | STS-1VBB w/E300 | CG | 20.00 | -90.00 | 0.00 | 15.00 |
| 00 | BH2 | STS-1VBB w/E300 | CG | 20.00 | 0.00 | 90.00 | 15.00 |
| 00 | BH1 | STS-1VBB w/E300 | CG | 20.00 | 0.00 | 0.00 | 15.00 |
| 10 | BHZ | STS-2 High-gain | CG | 40.00 | -90.00 | 0.00 | 15.00 |
| 10 | BH2 | STS-2 High-gain | CG | 40.00 | 0.00 | 90.00 | 15.00 |
| 10 | BH1 | STS-2 High-gain | CG | 40.00 | 0.00 | 0.00 | 15.00 |
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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. Â The USGS analyzes the random binary calibration signal in order to estimate the instrument response. Â 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.
| Loc | Chan | Cal Date | Epoch-Span | Grade | Amp Nominal Error (dB) | Amp Best Fit Error (dB) | Phase Nominal Error (degree) | Phase Best Fit Error (degree) | Sensor | Cal Type |
|---|---|---|---|---|---|---|---|---|---|---|
| 00 | BHZ | 2012:125 | 2010:136 to No Ending Ti | A | 0.059424 | 0.01218 | 0.33069 | 0.17709 | STS1VBBE3 | Random |
| 00 | BH2 | 2012:125 | 2010:136 to No Ending Ti | A | 0.035357 | 0.0074917 | 0.23053 | 0.28094 | STS1VBBE3 | Random |
| 00 | BH1 | 2012:125 | 2010:136 to No Ending Ti | A | 0.15102 | 0.013457 | 0.71881 | 0.47135 | STS1VBBE3 | Random |
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Current IssuesSTS-1 N-S LP pulsing present.
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2012-06-28E300 cables were replaced to address over damped long period response.
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2009-04-06Upgraded to Q330 digitizer.
