Seismic Network Operations
IU INCN
Inchon, Republic of Korea
IU INCN commences operations on: 1995,201
Host:  Korea Meteorological Administration 

Latitude:  37.478 
Longitude:  126.624 
Elevation:  80 
Datalogger:  Q330 
Broadband:  STS1VBB_w/E300 
Accelerometer:  FBA_EST_EpiSensor_Accelerometer 
Telemetry Status at the NEIC:  Last Data In Less Than 10 Minutes 
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 Code  Channel Code  Instrument  Flags  Sample Rate  Dip  Azimuth  Depth 

20  LNZ  FBA EST EpiSensor Accelerometer  CG  1.00  90.00  0.00  15.00 
20  LN2  FBA EST EpiSensor Accelerometer  CG  1.00  0.00  90.00  15.00 
20  LN1  FBA EST EpiSensor Accelerometer  CG  1.00  0.00  0.00  15.00 
20  HNZ  FBA EST EpiSensor Accelerometer  TG  100.00  90.00  0.00  15.00 
20  HN2  FBA EST EpiSensor Accelerometer  TG  100.00  0.00  90.00  15.00 
20  HN1  FBA EST EpiSensor Accelerometer  TG  100.00  0.00  0.00  15.00 
10  VHZ  STS2 Highgain  CG  0.10  90.00  0.00  15.00 
10  VH2  STS2 Highgain  CG  0.10  0.00  90.00  15.00 
10  VH1  STS2 Highgain  CG  0.10  0.00  0.00  15.00 
10  LHZ  STS2 Highgain  CG  1.00  90.00  0.00  15.00 
10  LH2  STS2 Highgain  CG  1.00  0.00  90.00  15.00 
10  LH1  STS2 Highgain  CG  1.00  0.00  0.00  15.00 
10  BH2  STS2 Highgain  CG  40.00  0.00  90.00  15.00 
10  HHZ  STS2 Highgain  TG  100.00  90.00  0.00  15.00 
10  HH2  STS2 Highgain  TG  100.00  0.00  90.00  15.00 
10  HH1  STS2 Highgain  TG  100.00  0.00  0.00  15.00 
10  BHZ  STS2 Highgain  CG  40.00  90.00  0.00  15.00 
10  BH1  STS2 Highgain  CG  40.00  0.00  0.00  15.00 
00  VHZ  STS1VBB w/E300  CG  0.10  90.00  0.00  15.00 
00  VH2  STS1VBB w/E300  CG  0.10  0.00  89.00  15.00 
00  VH1  STS1VBB w/E300  CG  0.10  0.00  359.00  15.00 
00  LHZ  STS1VBB w/E300  CG  1.00  90.00  0.00  15.00 
00  LH2  STS1VBB w/E300  CG  1.00  0.00  89.00  15.00 
00  LH1  STS1VBB w/E300  CG  1.00  0.00  359.00  15.00 
00  BHZ  STS1VBB w/E300  CG  20.00  90.00  0.00  15.00 
00  BH2  STS1VBB w/E300  CG  20.00  0.00  89.00  15.00 
00  BH1  STS1VBB w/E300  CG  20.00  0.00  359.00  15.00 
PDF, Last Month
PDF, Last Year
PDF, Month
PDF, Current Week
PDF, Year
Availability, Since 1972
Availability, 2 Month
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 threestep method to estimate instrument response parameters (poles, zeros, sensitivity and gain) and their associated errors using random calibration signals. First, we solve a coarse nonlinear 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 localminimum solution) caused by noise in the calibration records and enhances algorithm convergence. Second, we iteratively solve a nonlinear parameter estimation problem to obtain the least squares bestfit 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 2/3rdsoctave band centered at each bestfit pole/zero frequency. This procedure yields error estimates of the 99% confidence interval.
Loc  Chan  Cal Date  EpochSpan  Grade  Amp Nominal Error (dB)  Amp Best Fit Error (dB)  Phase Nominal Error (degree)  Phase Best Fit Error (degree)  Sensor  Cal Type 

00  BHZ  2012:041  2011:340 to No Ending T  A  0.014755  0.011655  0.11527  0.19617  STS1VBBE3  Random 
10  BHZ  2012:042  2011:341 to No Ending Ti  A  0.015388  0.014262  0.10899  0.10844  STS2HG  Random 
00  BH1  2012:041  2011:340 to No Ending T  A  0.014729  0.0088249  0.11605  0.12298  STS1VBBE3  Random 
00  BH2  2012:041  2011:340 to No Ending T  A  0.01413  0.010149  0.10713  0.1819  STS1VBBE3  Random 

20131120Station equipment installed in new vault and data flow restored.

20121015Station equipment temporarily removed due to new vault and weather station construction.

20111208Maintenance trip. STS1 repaired.

20101006STS1 is inoperable due to vault flooding.

20091116Upgraded to Q330 digitizer.