Seismic Network Operations


Kevo, Finland

IU KEV commences operations on: 1993,158

Country Flag
Host: Geological Survey of Finland
Latitude: 69.757
Longitude: 27.003
Elevation: 100
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 Station Photo 

Vault Condition: The vault is located in a horizontal tunnel dug into granite with an overburden of approximately 15 meters. Piers are isolated from the floor. Heaters are used during the winter. Dehumidifiers are not required.

Site Geology: The piers are resting on granite.

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
10BHZSTS-2 Standard-gainCG40.00-90.000.0015.00
10BH2STS-2 Standard-gainCG40.000.0090.0015.00
10BH1STS-2 Standard-gainCG40.000.000.0015.00
00BHZSTS-1VBB w/E300CG20.00-90.000.0015.00
00BH2STS-1VBB w/E300CG20.000.0084.0015.00
00BH1STS-1VBB w/E300CG20.000.00354.0015.00
20HNZFBA ES-T EpiSensor AccelerometerTG100.00-90.000.0015.00
20HN2FBA ES-T EpiSensor AccelerometerTG100.000.0090.0015.00
20HN1FBA ES-T EpiSensor AccelerometerTG100.000.000.0015.00
10HHZSTS-2 Standard-gainTG100.00-90.000.0015.00
10HH2STS-2 Standard-gainTG100.000.0090.0015.00
10HH1STS-2 Standard-gainTG100.000.000.0015.00
30LDOIU Paroscientific MicrobarographCW1.000.000.0015.00
20LNZFBA ES-T EpiSensor AccelerometerCG1.00-90.000.0015.00
20LN2FBA ES-T EpiSensor AccelerometerCG1.000.0090.0015.00
20LN1FBA ES-T EpiSensor AccelerometerCG1.000.000.0015.00
10LHZSTS-2 Standard-gainCG1.00-90.000.0015.00
10LH2STS-2 Standard-gainCG1.000.0090.0015.00
10LH1STS-2 Standard-gainCG1.000.000.0015.00
00LHZSTS-1VBB w/E300CG1.00-90.000.0015.00
00LH2STS-1VBB w/E300CG1.000.0084.0015.00
00LH1STS-1VBB w/E300CG1.000.00354.0015.00
10VHZSTS-2 Standard-gainCG0.10-90.000.0015.00
10VH2STS-2 Standard-gainCG0.100.0090.0015.00
10VH1STS-2 Standard-gainCG0.100.000.0015.00
00VHZSTS-1VBB w/E300CG0.10-90.000.0015.00
00VH2STS-1VBB w/E300CG0.100.0084.0015.00
00VH1STS-1VBB w/E300CG0.100.00354.0015.00
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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
10BHZ2012:172 2012:170 to No Ending TiA0.0153420.0141560.117020.11458 STS-2-SGRandom
00BHZ2012:171 2012:170 to No Ending TA0.0153450.0107150.138780.11808 STS1VBBE3Random
00BH22012:171 2012:170 to No Ending TA0.0146150.0105570.147880.11726 STS1VBBE3Random
00BH12012:171 2012:170 to No Ending TA0.0156140.0104220.149060.11853 STS1VBBE3Random
  1. Current Issues
    The Slate has falied. A replacement is on the way.
  2. 2013-09-24
    Router repaired and communication restored.
  3. 2012-06-19
    The broken CMG-3T was replaced by a STS-2.
  4. 2008-09-11
    Upgraded to Q330 digitizer.