Seismic Network Operations

IU SLBS

Sierra la Laguna Baja California Sur, Mexico

IU SLBS commences operations on: 2008,350

Host: Center for Scientific Investigation and Higher Education of Ensenada
Latitude: 23.686
Longitude: -109.944
Elevation: 825
Datalogger: Q330
Broadband: STS-1V/VBB
Accelerometer: FBA_ES-T_EpiSensor_Accelerometer
Telemetry Status at the NEIC: No Data In More Than 24 Hours
Station Photo Station Photo Station Photo Station Photo 
Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
20LNZFBA ES-T EpiSensor AccelerometerCG1.00-90.000.000.00
20LNNFBA ES-T EpiSensor AccelerometerCG1.000.000.000.00
20LNEFBA ES-T EpiSensor AccelerometerCG1.000.0090.000.00
20HNZFBA ES-T EpiSensor AccelerometerTG100.00-90.000.000.00
20HNNFBA ES-T EpiSensor AccelerometerTG100.000.000.000.00
20HNEFBA ES-T EpiSensor AccelerometerTG100.000.0090.000.00
10LHESTS-2 High-gainCG1.000.0090.000.00
10HHZSTS-2 High-gainTG100.00-90.000.000.00
10LHNSTS-2 High-gainCG1.000.000.000.00
10VHESTS-2 High-gainCG0.100.0090.000.00
10LHZSTS-2 High-gainCG1.00-90.000.000.00
10VHZSTS-2 High-gainCG0.10-90.000.000.00
10VHNSTS-2 High-gainCG0.100.000.000.00
30LDOIU Paroscientific MicrobarographCW1.000.000.000.00
10HHNSTS-2 High-gainTG100.000.000.000.00
10HHESTS-2 High-gainTG100.000.0090.000.00
10BHZSTS-2 High-gainCG40.00-90.000.000.00
10BHNSTS-2 High-gainCG40.000.000.000.00
10BHESTS-2 High-gainCG40.000.0090.000.00
00VHZSTS-1V/VBBCG0.10-90.000.000.00
00VHNSTS-1H/VBBCG0.100.000.000.00
00VHESTS-1H/VBBCG0.100.0090.000.00
00LHZSTS-1V/VBBCG1.00-90.000.000.00
00LHNSTS-1H/VBBCG1.000.000.000.00
00LHESTS-1H/VBBCG1.000.0090.000.00
00BHZSTS-1V/VBBCG20.00-90.000.000.00
00BHNSTS-1H/VBBCG20.000.000.000.00
00BHESTS-1H/VBBCG20.000.0090.000.00
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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
10BHZ2012:031 2008:350 to No Ending TA0.0151590.0142390.125410.11568 STS-2-HGRandom
00BHZ2012:031 2008:350 to No Ending TA0.0171820.0113960.153220.1327 STS1HVBBRandom
00BHN2012:031 2008:350 to No Ending TA0.160980.0373271.48490.85053 STS1HVBBRandom
  1. Current Issues
    The VSAT modem is not functioning. The STS-1 horizontals have been off center since late Nov. 2011.