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
00VH1Geotech KS-54000 Borehole SeismometerCG0.100.00318.00102.00
00LH1Geotech KS-54000 Borehole SeismometerCG1.000.00318.00102.00
00BH1Geotech KS-54000 Borehole SeismometerCG20.000.00318.00102.00
10VH1Guralp CMG3-T Seismometer (borehole)CG0.100.00229.009.00
10LH1Guralp CMG3-T Seismometer (borehole)CG1.000.00229.009.00
10HH1Guralp CMG3-T Seismometer (borehole)TG100.000.00229.009.00
10BH1Guralp CMG3-T Seismometer (borehole)CG40.000.00229.009.00
10VH2Guralp CMG3-T Seismometer (borehole)CG0.100.00139.009.00
10LH2Guralp CMG3-T Seismometer (borehole)CG1.000.00139.009.00
10HH2Guralp CMG3-T Seismometer (borehole)TG100.000.00139.009.00
10BH2Guralp CMG3-T Seismometer (borehole)CG40.000.00139.009.00
20LN2Kinemetrics FBA ES-T EpiSensor AccelerometerCG1.000.0090.000.00
20HN2Kinemetrics FBA ES-T EpiSensor AccelerometerTG100.000.0090.000.00
00VH2Geotech KS-54000 Borehole SeismometerCG0.100.0048.00102.00
00LH2Geotech KS-54000 Borehole SeismometerCG1.000.0048.00102.00
00BH2Geotech KS-54000 Borehole SeismometerCG20.000.0048.00102.00
20HN1Kinemetrics FBA ES-T EpiSensor AccelerometerTG100.000.000.000.00
10VHZGuralp CMG3-T Seismometer (borehole)CG0.10-90.000.009.00
31LDOCI/PAS pressure sensorCW1.000.000.000.00
30LDOCI/PAS pressure sensorCW1.000.000.000.00
20LNZKinemetrics FBA ES-T EpiSensor AccelerometerCG1.00-90.000.000.00
20LN1Kinemetrics FBA ES-T EpiSensor AccelerometerCG1.000.000.000.00
20HNZKinemetrics FBA ES-T EpiSensor AccelerometerTG100.00-90.000.000.00
10LHZGuralp CMG3-T Seismometer (borehole)CG1.00-90.000.009.00
10HHZGuralp CMG3-T Seismometer (borehole)TG100.00-90.000.009.00
10BHZGuralp CMG3-T Seismometer (borehole)CG40.00-90.000.009.00
00VMZGeotech KS-54000 Borehole SeismometerCH0.100.000.00102.00
00VM2Geotech KS-54000 Borehole SeismometerCH0.100.000.00102.00
00VM1Geotech KS-54000 Borehole SeismometerCH0.100.000.00102.00
00VHZGeotech KS-54000 Borehole SeismometerCG0.10-90.000.00102.00
00LHZGeotech KS-54000 Borehole SeismometerCG1.00-90.000.00102.00
00BHZGeotech KS-54000 Borehole SeismometerCG20.00-90.000.00102.00
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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
10BH22014:0862011:129 to No Ending TimeC2.79632.275417.898317.4742CMG3-T-BRandom
10BH12014:0862011:129 to No Ending TimeC2.96132.362420.139419.028CMG3-T-BRandom
10BHZ2014:0862011:129 to No Ending TimeC2.76122.21317.183618.3603CMG3-T-BRandom
00BHZ2014:0852011:129 to No Ending TimeA0.0101270.00597050.0711340.05545854000Random
00BH12014:0852011:129 to No Ending TimeA0.0170440.00620350.0777970.06300554000Random
00BH22014:0852011:129 to No Ending TimeA0.0259960.00701210.0864630.09271554000Random
  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.