Seismic Network Operations


Hockley, Texas

IU HKT commences operations on: 1995,192

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Host: University of Texas Austin
Latitude: 29.962
Longitude: -95.838
Elevation: -413
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 472 meters below surface in a salt mine. Temperature of the vault remains at approximately 37 degrees C. The pier is not isolated.

Site Geology: Located in the Willis Formation that is made of clay, silt, sand, and minor siliceous gravel. Deposited in the lower Pleistocene and is approximately 200 feet thick.

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
31LDOCI/PAS pressure sensorCW1.000.000.00450.00
30LDOlower quality chip sensor in Setra boxCW1.000.000.00450.00
20LNZKinemetrics FBA ES-T EpiSensor AccelerometerCG1.00-90.000.00450.00
20LN1Kinemetrics FBA ES-T EpiSensor AccelerometerCG1.000.000.00450.00
20HNZKinemetrics FBA ES-T EpiSensor AccelerometerTG100.00-90.000.00450.00
20HN1Kinemetrics FBA ES-T EpiSensor AccelerometerTG100.000.000.00450.00
10VMWStreckeisen STS-2 High-gainCH0.100.000.00450.00
10VMVStreckeisen STS-2 High-gainCH0.100.000.00450.00
10VMUStreckeisen STS-2 High-gainCH0.100.000.00450.00
10VHZStreckeisen STS-2 Standard-gainCG0.10-90.000.00450.00
10VH1Streckeisen STS-2 Standard-gainCG0.100.000.00450.00
10LHZStreckeisen STS-2 Standard-gainCG1.00-90.000.00450.00
10LH1Streckeisen STS-2 Standard-gainCG1.000.000.00450.00
10HHZStreckeisen STS-2 Standard-gainTG100.00-90.000.00450.00
10HH1Streckeisen STS-2 Standard-gainTG100.000.000.00450.00
10BHZStreckeisen STS-2 Standard-gainCG40.00-90.000.00450.00
10BH1Streckeisen STS-2 Standard-gainCG40.000.000.00450.00
00VMZStreckeisen STS-1VBB w/E300CH0.100.000.00450.00
00VM2Streckeisen STS-1VBB w/E300CH0.100.000.00450.00
00VM1Streckeisen STS-1VBB w/E300CH0.100.000.00450.00
00VHZStreckeisen STS-1VBB w/E300CG0.10-90.000.00450.00
00LHZStreckeisen STS-1VBB w/E300CG1.00-90.000.00450.00
00BHZStreckeisen STS-1VBB w/E300CG20.00-90.000.00450.00
00VH2Streckeisen STS-1VBB w/E300CG0.100.0089.00450.00
00LH2Streckeisen STS-1VBB w/E300CG1.000.0089.00450.00
00BH2Streckeisen STS-1VBB w/E300CG20.000.0089.00450.00
20LN2Kinemetrics FBA ES-T EpiSensor AccelerometerCG1.000.0090.00450.00
20HN2Kinemetrics FBA ES-T EpiSensor AccelerometerTG100.000.0090.00450.00
10VH2Streckeisen STS-2 Standard-gainCG0.100.0090.00450.00
10LH2Streckeisen STS-2 Standard-gainCG1.000.0090.00450.00
10HH2Streckeisen STS-2 Standard-gainTG100.000.0090.00450.00
10BH2Streckeisen STS-2 Standard-gainCG40.000.0090.00450.00
00VH1Streckeisen STS-1VBB w/E300CG0.100.00358.00450.00
00LH1Streckeisen STS-1VBB w/E300CG1.000.00358.00450.00
00BH1Streckeisen STS-1VBB w/E300CG20.000.00358.00450.00
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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
00BHZ2014:0382011:270 to No Ending TimeA0.016970.00910690.122930.17157STS1VBBE3Random
00BH12014:0382013:044 to No Ending TimeA0.0268340.00957540.142370.19672STS1VBBE3Random
00BH22014:0382011:270 to No Ending TimeA0.0238520.00952940.138920.20004STS1VBBE3Random
10BHZ2014:0392011:270 to No Ending TimeA0.0152010.0147390.126450.079768STS-2-SGRandom
  1. Current Issues.
    LN1 channel has been showing high noise levels. The STS-2.5 has been showing some spiking.
  2. 2011-10-03
    Upgraded to Q330 digitizer.