Seismic Network Operations


Narrogin, Australia

IU NWAO commences operations on: 1991,329

Country Flag
Host: Geoscience Australia
Latitude: -32.928
Longitude: 117.239
Elevation: 380
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: Borehole

Site Geology: Seismometer is located on the Pre-Cambrian shield known as Yilgarn block which consists of granite and granite gneiss. The age of the granite is about 2500m years. The site is in the south-west corner of the block, 230 km from the southern boundary and coast, and 130 km from the western boundary which is the Darling Fault. Site is 150 km from the west coast.

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
10VHZSTS-2 Standard-gainCG0.10-
10VH2STS-2 Standard-gainCG0.100.0090.000.00
10VH1STS-2 Standard-gainCG0.
20LNZFBA ES-T EpiSensor AccelerometerCG1.00-
20LN2FBA ES-T EpiSensor AccelerometerCG1.000.0090.000.00
20LN1FBA ES-T EpiSensor AccelerometerCG1.
10LHZSTS-2 Standard-gainCG1.00-
10LH2STS-2 Standard-gainCG1.000.0090.000.00
10LH1STS-2 Standard-gainCG1.
30LDOCI/PAS pressure sensorCW1.
20HNZFBA ES-T EpiSensor AccelerometerTG100.00-
20HN2FBA ES-T EpiSensor AccelerometerTG100.000.0090.000.00
20HN1FBA ES-T EpiSensor AccelerometerTG100.
10HHZSTS-2 Standard-gainTG100.00-
10HH2STS-2 Standard-gainTG100.000.0090.000.00
10HH1STS-2 Standard-gainTG100.
10BHZSTS-2 Standard-gainCG40.00-
10BH2STS-2 Standard-gainCG40.000.0090.000.00
10BH1STS-2 Standard-gainCG40.
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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
00BH12011:121 2011:120 to No Ending TiA0.00956360.00627580.0534050.072878 54000Random
00BH22011:121 2011:120 to No Ending TiA0.0103330.00675280.0562730.073701 54000Random
00BHZ2011:121 2011:120 to No Ending TiA0.0192730.00761810.0519390.10833 54000Random
10BHZ2011:121 2011:120 to No Ending TiA0.0128420.013020.0674630.073734 STS-2-SGRandom
  1. Current Issues
    High noise on the LN1 Episensor component.
  2. 2011-05-02
    Upgraded to Q330 digitizer.
  3. 2010-09-27
    Maintenance trip. KS54000 fixed.
  4. 2009-11-06
    KS54000 is no longer functioning.