Seismic Network Operations


Port Moresby, New Guinea

IU PMG commences operations on: 1993,253

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Host: Port Moresby Geophysical Observatory
Latitude: -9.405
Longitude: 147.16
Elevation: 90
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
Station Photo Station Photo Station Photo 

Vault Condition: The seismometer vault is a concrete room covered with earth to a depth of approximately two meters. The vault is airconditioned.

Site Geology: Eocene Chert.

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
20LNZFBA ES-T EpiSensor AccelerometerCG1.00-90.000.0015.00
20HNZFBA ES-T EpiSensor AccelerometerTG100.00-90.000.0015.00
00VHZSTS-1VBB w/E300CG0.10-
00LHZSTS-1VBB w/E300CG1.00-
00BHZSTS-1VBB w/E300CG20.00-
30LDOCI/PAS pressure sensorCW1.
30BDOCI/PAS pressure sensorCW40.
20LN2FBA ES-T EpiSensor AccelerometerCG1.000.0090.0015.00
20LN1FBA ES-T EpiSensor AccelerometerCG1.000.000.0015.00
20HN2FBA ES-T EpiSensor AccelerometerTG100.000.0090.0015.00
20HN1FBA ES-T EpiSensor AccelerometerTG100.000.000.0015.00
00VH2STS-1VBB w/E300CG0.100.0088.000.00
00VH1STS-1VBB w/E300CG0.100.00358.000.00
00LH2STS-1VBB w/E300CG1.000.0088.000.00
00LH1STS-1VBB w/E300CG1.000.00358.000.00
00BH2STS-1VBB w/E300CG20.000.0088.000.00
00BH1STS-1VBB w/E300CG20.000.00358.000.00
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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
10BHZ2011:211 2010:106 to No Ending TA0.0126780.00840620.0719840.06995 CMG3-TRandom
10BH22011:211 2010:106 to No Ending TA0.00867450.0102150.063760.10109 CMG3-TRandom
10BH12011:211 2010:106 to No Ending TA0.0118880.00934680.124280.094309 CMG3-TRandom
00BHZ2011:210 2010:106 to No Ending TA0.018960.00883320.153390.10832 STS1VBBE3Random
00BH22011:210 2010:106 to No Ending TA0.0178780.00871680.146520.1221 STS1VBBE3Random
00BH12011:210 2010:106 to No Ending TA0.0179930.0118350.141960.093833 STS1VBBE3Random
  1. Current Issues
    Seismometer vault is leaking. Repairs are under way.
  2. 2010-04-19
    Upgraded to Q330 digitizer.