Seismic Network Operations


Kipapa, Hawaii, USA

IU KIP commences operations on: 1988,228

Country Flag
Host: Pacific Tsunami Warning Center
Latitude: 21.42
Longitude: -158.011
Elevation: 110
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: Vault is located at the end of a tunnel used during World War II to store ammuniation. 80 meter tunnel is cut into the side of a canyon on basalt of the Koolau Volcanic Series. The piers are made of concrete, isolated from the concrete floor, and extending approximately 3 feet below floor level and 1.5 feet above. They rest on weathered basalt. Temperature is stable. Dehumidifiers are used to control the humidity. Temperature +20 to +25 degrees Celsius.

Site Geology: The Kipapa tunnel is cut in the side of a canyon of basalt of the Koolau Series (Tertiary). Pier rests on weathered basalt.

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
30LDOCI/PAS pressure sensorCW1.
20LNZFBA ES-T EpiSensor AccelerometerCG1.00-90.000.0033.00
20LN2FBA ES-T EpiSensor AccelerometerCG1.000.0090.0033.00
20LN1FBA ES-T EpiSensor AccelerometerCG1.000.000.0033.00
20HNZFBA ES-T EpiSensor AccelerometerTG100.00-90.000.0033.00
20HN2FBA ES-T EpiSensor AccelerometerTG100.000.0090.0033.00
20HN1FBA ES-T EpiSensor AccelerometerTG100.000.000.0033.00
10VHZSTS-2 Standard-gainCG0.10-90.000.0033.00
10VH2STS-2 Standard-gainCG0.100.0090.0033.00
10VH1STS-2 Standard-gainCG0.100.000.0033.00
10LHZSTS-2 Standard-gainCG1.00-90.000.0033.00
10HH2STS-2 Standard-gainTG100.000.0090.0033.00
10HH1STS-2 Standard-gainTG100.000.000.0033.00
10LH2STS-2 Standard-gainCG1.000.0090.0033.00
10LH1STS-2 Standard-gainCG1.000.000.0033.00
10HHZSTS-2 Standard-gainTG100.00-90.000.0033.00
10BHZSTS-2 Standard-gainCG40.00-90.000.0033.00
10BH2STS-2 Standard-gainCG40.000.0090.0033.00
10BH1STS-2 Standard-gainCG40.000.000.0033.00
00VHZSTS-1VBB w/E300CG0.10-90.000.0033.00
00VH2STS-1VBB w/E300CG0.100.0090.0033.00
00VH1STS-1VBB w/E300CG0.100.000.0033.00
00LHZSTS-1VBB w/E300CG1.00-90.000.0033.00
00LH2STS-1VBB w/E300CG1.000.0090.0033.00
00LH1STS-1VBB w/E300CG1.000.000.0033.00
00BHZSTS-1VBB w/E300CG20.00-90.000.0033.00
00BH2STS-1VBB w/E300CG20.000.0090.0033.00
00BH1STS-1VBB w/E300CG20.000.000.0033.00
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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
10BHZ2011:316 2010:230 to No Ending TA0.0133270.0128360.0736110.076494 STS-2-SGRandom
00BHZ2011:315 2011:306 to No Ending TiA0.0171460.0102410.126460.18253 STS1VBBE3Random
00BH22011:315 2011:306 to No Ending TiA0.0204550.00901840.13060.16779 STS1VBBE3Random
00BH12011:315 2011:306 to No Ending TiA0.0179260.00907970.122960.18618 STS1VBBE3Random
  1. 2012-03-23
    STS-2 replaced with STS-2.5. Vacuum leak fixed on STS-1.
  2. 2012-03-02
    The Episensor which had excessively noisy channels was replaced.
  3. 2011-11-11
    Replaced cables to fix lowered long period response problem that had persisted since upgrade.
  4. 2010-08-26
    Upgraded to Q330 digitizer.