Seismic Network Operations


Inchon, Republic of Korea

IU INCN commences operations on: 1995,201

Country Flag
Host: Korea Meteorological Administration
Latitude: 37.478
Longitude: 126.624
Elevation: 80
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 vault is constructed of steel, with 2 meters of overburden. The concrete pier is isolated from the steel vault and is attached to the bedrock.

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
10BH1STS-2 High-gainCG40.000.000.0015.00
00BH1STS-1VBB w/E300CG20.000.00359.0015.00
10BH2STS-2 High-gainCG40.000.0090.0015.00
00BH2STS-1VBB w/E300CG20.000.0089.0015.00
10BHZSTS-2 High-gainCG40.00-90.000.0015.00
00BHZSTS-1VBB w/E300CG20.00-90.000.0015.00
10HH1STS-2 High-gainTG100.000.000.0015.00
10HH2STS-2 High-gainTG100.000.0090.0015.00
10HHZSTS-2 High-gainTG100.00-90.000.0015.00
20HN1FBA ES-T EpiSensor AccelerometerTG100.000.000.0015.00
20HN2FBA ES-T EpiSensor AccelerometerTG100.000.0090.0015.00
20HNZFBA ES-T EpiSensor AccelerometerTG100.00-90.000.0015.00
10LH1STS-2 High-gainCG1.000.000.0015.00
00LH1STS-1VBB w/E300CG1.000.00359.0015.00
10LH2STS-2 High-gainCG1.000.0090.0015.00
00LH2STS-1VBB w/E300CG1.000.0089.0015.00
10LHZSTS-2 High-gainCG1.00-90.000.0015.00
00LHZSTS-1VBB w/E300CG1.00-90.000.0015.00
20LN1FBA ES-T EpiSensor AccelerometerCG1.000.000.0015.00
20LN2FBA ES-T EpiSensor AccelerometerCG1.000.0090.0015.00
20LNZFBA ES-T EpiSensor AccelerometerCG1.00-90.000.0015.00
10VH1STS-2 High-gainCG0.100.000.0015.00
00VH1STS-1VBB w/E300CG0.100.00359.0015.00
10VH2STS-2 High-gainCG0.100.0090.0015.00
00VH2STS-1VBB w/E300CG0.100.0089.0015.00
10VHZSTS-2 High-gainCG0.10-90.000.0015.00
00VHZSTS-1VBB w/E300CG0.10-90.000.0015.00
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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
00BHZ2012:041 2011:340 to No Ending TA0.0147550.0116550.115270.19617 STS1VBBE3Random
10BHZ2012:042 2011:341 to No Ending TiA0.0153880.0142620.108990.10844 STS-2-HGRandom
00BH12012:041 2011:340 to No Ending TA0.0147290.00882490.116050.12298 STS1VBBE3Random
00BH22012:041 2011:340 to No Ending TA0.014130.0101490.107130.1819 STS1VBBE3Random
  1. 2013-11-20
    Station equipment installed in new vault and data flow restored.
  2. 2012-10-15
    Station equipment temporarily removed due to new vault and weather station construction.
  3. 2011-12-08
    Maintenance trip. STS-1 repaired.
  4. 2010-10-06
    STS-1 is inoperable due to vault flooding.
  5. 2009-11-16
    Upgraded to Q330 digitizer.