Seismic Network Operations

IU TARA

Tarawa Island, Republic of Kiribati

IU TARA commences operations on: 2007,001

Country Flag
Host: Kiribati Weather Service
Latitude: 1.355
Longitude: 172.923
Elevation: 20
Datalogger: Q330
Broadband: STS-2_Standard-gain
Accelerometer: FBA_ES-T_EpiSensor_Accelerometer
Telemetry Status at the NEIC: No Data In More Than 24 Hours
Station Photo Station Photo Station Photo 
Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
30LDOIU Paroscientific MicrobarographCW1.000.000.0015.00
20LNZKinemetrics FBA ES-T EpiSensor AccelerometerCG1.00-90.000.000.00
20LN2Kinemetrics FBA ES-T EpiSensor AccelerometerCG1.000.0090.000.00
20LN1Kinemetrics FBA ES-T EpiSensor AccelerometerCG1.000.000.000.00
20HNZKinemetrics FBA ES-T EpiSensor AccelerometerTG100.00-90.000.000.00
20HN2Kinemetrics FBA ES-T EpiSensor AccelerometerTG100.000.0090.000.00
20HN1Kinemetrics FBA ES-T EpiSensor AccelerometerTG100.000.000.000.00
10VHZStreckeisen STS-2 High-gainCG0.10-90.000.000.00
10VH2Streckeisen STS-2 High-gainCG0.100.0092.000.00
10VH1Streckeisen STS-2 High-gainCG0.100.002.000.00
10LHZStreckeisen STS-2 High-gainCG1.00-90.000.000.00
10LH2Streckeisen STS-2 High-gainCG1.000.0092.000.00
10LH1Streckeisen STS-2 High-gainCG1.000.002.000.00
10HHZStreckeisen STS-2 High-gainTG100.00-90.000.000.00
10HH2Streckeisen STS-2 High-gainTG100.000.0092.000.00
10HH1Streckeisen STS-2 High-gainTG100.000.002.000.00
10BHZStreckeisen STS-2 High-gainCG40.00-90.000.000.00
10BH2Streckeisen STS-2 High-gainCG40.000.0092.000.00
10BH1Streckeisen STS-2 High-gainCG40.000.002.000.00
00VHZStreckeisen STS-2 Standard-gainCG0.10-90.000.000.00
00VH2Streckeisen STS-2 Standard-gainCG0.100.0090.000.00
00VH1Streckeisen STS-2 Standard-gainCG0.100.000.000.00
00LHZStreckeisen STS-2 Standard-gainCG1.00-90.000.000.00
00LH2Streckeisen STS-2 Standard-gainCG1.000.0090.000.00
00LH1Streckeisen STS-2 Standard-gainCG1.000.000.000.00
00HHZStreckeisen STS-2 Standard-gainTG100.00-90.000.000.00
00HH2Streckeisen STS-2 Standard-gainTG100.000.0090.000.00
00HH1Streckeisen STS-2 Standard-gainTG100.000.000.000.00
00BHZStreckeisen STS-2 Standard-gainCG40.00-90.000.000.00
00BH2Streckeisen STS-2 Standard-gainCG40.000.0090.000.00
00BH1Streckeisen STS-2 Standard-gainCG40.000.000.000.00
PDF, All
Image Unavailable

PDF, Last Month
Image Unavailable

PDF, Month
Image Unavailable

PDF, Current Week
Image Unavailable

PDF, Year
Image Unavailable

Heliplot
Image Unavailable
Latency
Image Unavailable

Availability, Year
Image Unavailable

Availability, Since 1972
Image Unavailable

Availability, 2 Month
Image Unavailable

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
00BHZ2009:321 2009:317 to 2011,019,22 A0.0379230.019390.708980.74339 STS-2-HGRandom
10BHZ2011:021 2009:317 to No Ending TiA0.0232970.0146750.0939310.076389 STS-2-HGRandom
00BHZ2014:1422012:308 to No Ending TimeA0.0148370.0151980.113170.073869STS-2-SGRandom
10BHZ2014:1432011:262 to No Ending TimeA0.0140830.0145860.0834710.074875STS-2-HGRandom
  1. Current Issues
    STS-2 is showing spikes on all components.
  2. 2011-01-19
    New granite baseplate and new STS-2 installed to address observed high levels of long period noise and high DC offset.
  3. 2009-11-13
    Upgraded to Q330 digitizer.