Seismic Network Operations

IU MBWA

Marble Bar, Western Australia

IU MBWA commences operations on: 2001,237

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Host: Geoscience Australia
Latitude: -21.159
Longitude: 119.731
Elevation: 190
Datalogger: Q330
Broadband: KS-54000
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: KS54000 borehole depth is -102m. CMG3-T-B borehole depth is -9.0

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
10LHZCMG3-TBCG1.00-90.000.009.00
30LDOCI/PAS pressure sensorCW1.000.000.000.00
20LNZFBA ES-T EpiSensor AccelerometerCG1.00-90.000.000.00
20LN1FBA ES-T EpiSensor AccelerometerCG1.000.000.000.00
20HNZFBA ES-T EpiSensor AccelerometerTG100.00-90.000.000.00
20HN1FBA ES-T EpiSensor AccelerometerTG100.000.000.000.00
10VHZCMG3-TBCG0.10-90.000.009.00
10HHZCMG3-TBTG100.00-90.000.009.00
10BHZCMG3-TBCG40.00-90.000.009.00
00VHZKS-54000CG0.10-90.000.00102.00
00LHZKS-54000CG1.00-90.000.00102.00
00BHZKS-54000CG20.00-90.000.00102.00
00VH2KS-54000CG0.100.0048.00102.00
00LH2KS-54000CG1.000.0048.00102.00
00BH2KS-54000CG20.000.0048.00102.00
20LN2FBA ES-T EpiSensor AccelerometerCG1.000.0090.000.00
20HN2FBA ES-T EpiSensor AccelerometerTG100.000.0090.000.00
10LH2CMG3-TBCG1.000.00139.009.00
10VH2CMG3-TBCG0.100.00139.009.00
10HH2CMG3-TBTG100.000.00139.009.00
10BH2CMG3-TBCG40.000.00139.009.00
10LH1CMG3-TBCG1.000.00229.009.00
10VH1CMG3-TBCG0.100.00229.009.00
10HH1CMG3-TBTG100.000.00229.009.00
10BH1CMG3-TBCG40.000.00229.009.00
00VH1KS-54000CG0.100.00318.00102.00
00LH1KS-54000CG1.000.00318.00102.00
00BH1KS-54000CG20.000.00318.00102.00
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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
00BH12011:129 2011:129 to No Ending TiA0.0165940.00555420.0690010.066507 54000Random
00BH22011:129 2011:129 to No Ending TiA0.026210.00655270.0804680.10262 54000Random
00BHZ2011:129 2011:129 to No Ending TiA0.0103710.00524820.0634890.052968 54000Random
10BH12011:130 2011:129 to No Ending TiB0.0285170.0104640.12380.16656 CMG3-T-BRandom
10BH22011:130 2011:129 to No Ending TiB0.122060.0509381.02641.2693 CMG3-T-BRandom
10BHZ2011:130 2011:129 to No Ending TiB0.0280940.0108620.16680.20423 CMG3-T-BRandom
  1. Current Issues
    Pulsing on the KS54000 H2 component. Episensor LNZ component is noisy. The CMG-3TB is currently inoperable.
  2. 2011-05-09
    Upgraded to Q330 digitizer.