Seismic Network Operations

IU XMAS

Kiritimati Island, Republic of Kiribati

IU XMAS commences operations on: 1997,234

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Host: Japan Aerospace Exploration Agency
Latitude: 2.045
Longitude: -157.446
Elevation: 20
Datalogger: Q680
Broadband: STS-2/VBB
Accelerometer: FBA_ES-T_EpiSensor_Accelerometer
Telemetry Status at the NEIC: No Data In More Than 24 Hours
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Site Description: NASDA Downrange Tracking Station provides generator power and the, building for the Seismic recording system.,

Vault Condition: Subsurface Vault concrete pier buried.

Site Geology: Coral Atoll

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
00VMWStreckeisen STS-2.5CH0.100.000.001.00
00VMVStreckeisen STS-2.5CH0.100.000.001.00
00VMUStreckeisen STS-2.5CH0.100.000.001.00
00VHZStreckeisen STS-2.5CG0.10-90.000.001.00
00VH2Streckeisen STS-2.5CG0.100.0087.001.00
00VH1Streckeisen STS-2.5CG0.100.00357.001.00
00LHZStreckeisen STS-2.5CG1.00-90.000.001.00
00LH2Streckeisen STS-2.5CG1.000.0087.001.00
00LH1Streckeisen STS-2.5CG1.000.00357.001.00
00BHZStreckeisen STS-2.5CG40.00-90.000.001.00
00BH2Streckeisen STS-2.5CG40.000.0087.001.00
00BH1Streckeisen STS-2.5CG40.000.00357.001.00
10VMWStreckeisen STS-2 High-gainCH0.100.000.001.00
10VMVStreckeisen STS-2 High-gainCH0.100.000.001.00
10VMUStreckeisen STS-2 High-gainCH0.100.000.001.00
10VHZStreckeisen STS-2 High-gainCG0.10-90.000.001.00
10VH2Streckeisen STS-2 High-gainCG0.100.0090.001.00
10VH1Streckeisen STS-2 High-gainCG0.100.000.001.00
10LHZStreckeisen STS-2 High-gainCG1.00-90.000.001.00
10LH2Streckeisen STS-2 High-gainCG1.000.0090.001.00
10LH1Streckeisen STS-2 High-gainCG1.000.000.001.00
10HHZStreckeisen STS-2 High-gainTG100.00-90.000.001.00
10HH2Streckeisen STS-2 High-gainTG100.000.0090.001.00
10HH1Streckeisen STS-2 High-gainTG100.000.000.001.00
10BHZStreckeisen STS-2 High-gainCG40.00-90.000.001.00
10BH2Streckeisen STS-2 High-gainCG40.000.0090.001.00
10BH1Streckeisen STS-2 High-gainCG40.000.000.001.00
20LNZKinemetrics FBA ES-T EpiSensor AccelerometerCG1.00-90.000.001.00
20LN2Kinemetrics FBA ES-T EpiSensor AccelerometerCG1.000.0090.001.00
20LN1Kinemetrics FBA ES-T EpiSensor AccelerometerCG1.000.000.001.00
20HNZKinemetrics FBA ES-T EpiSensor AccelerometerTG100.00-90.000.001.00
20HN2Kinemetrics FBA ES-T EpiSensor AccelerometerTG100.000.0090.001.00
20HN1Kinemetrics FBA ES-T EpiSensor AccelerometerTG100.000.000.001.00
30LDOlower quality chip sensor in Setra boxCW1.000.000.001.00
31LDOCI/PAS pressure sensorCW1.000.000.001.00
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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
10BHZ2012:220 2009:131 to No Ending TB0.0715670.0685840.737750.82016 STS2VBBRandom
  1. Current Issues
    The STS-2 (location code 00) is currently not functioning.