Seismic Network Operations
IU KEV
Kevo, Finland
IU KEV commences operations on: 1993,158
Host:  Geological Survey of Finland 

Latitude:  69.757 
Longitude:  27.003 
Elevation:  100 
Datalogger:  Q330 
Broadband:  STS1VBB_w/E300 
Accelerometer:  FBA_EST_EpiSensor_Accelerometer 
Telemetry Status at the NEIC:  Last Data In Less Than 10 Minutes 
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 Code  Channel Code  Instrument  Flags  Sample Rate  Dip  Azimuth  Depth 

20  LNZ  FBA EST EpiSensor Accelerometer  CG  1.00  90.00  0.00  15.00 
20  LN2  FBA EST EpiSensor Accelerometer  CG  1.00  0.00  90.00  15.00 
20  LN1  FBA EST EpiSensor Accelerometer  CG  1.00  0.00  0.00  15.00 
10  VHZ  STS2 Standardgain  CG  0.10  90.00  0.00  15.00 
10  VH2  STS2 Standardgain  CG  0.10  0.00  90.00  15.00 
10  VH1  STS2 Standardgain  CG  0.10  0.00  0.00  15.00 
10  LHZ  STS2 Standardgain  CG  1.00  90.00  0.00  15.00 
10  LH2  STS2 Standardgain  CG  1.00  0.00  90.00  15.00 
10  LH1  STS2 Standardgain  CG  1.00  0.00  0.00  15.00 
10  BHZ  STS2 Standardgain  CG  40.00  90.00  0.00  15.00 
10  BH2  STS2 Standardgain  CG  40.00  0.00  90.00  15.00 
10  BH1  STS2 Standardgain  CG  40.00  0.00  0.00  15.00 
00  VHZ  STS1VBB w/E300  CG  0.10  90.00  0.00  15.00 
00  VH2  STS1VBB w/E300  CG  0.10  0.00  84.00  15.00 
00  VH1  STS1VBB w/E300  CG  0.10  0.00  354.00  15.00 
00  LHZ  STS1VBB w/E300  CG  1.00  90.00  0.00  15.00 
00  LH2  STS1VBB w/E300  CG  1.00  0.00  84.00  15.00 
00  LH1  STS1VBB w/E300  CG  1.00  0.00  354.00  15.00 
00  BHZ  STS1VBB w/E300  CG  20.00  90.00  0.00  15.00 
00  BH2  STS1VBB w/E300  CG  20.00  0.00  84.00  15.00 
00  BH1  STS1VBB w/E300  CG  20.00  0.00  354.00  15.00 
30  LDO  IU Paroscientific Microbarograph  CW  1.00  0.00  0.00  15.00 
20  HNZ  FBA EST EpiSensor Accelerometer  TG  100.00  90.00  0.00  15.00 
20  HN2  FBA EST EpiSensor Accelerometer  TG  100.00  0.00  90.00  15.00 
20  HN1  FBA EST EpiSensor Accelerometer  TG  100.00  0.00  0.00  15.00 
10  HHZ  STS2 Standardgain  TG  100.00  90.00  0.00  15.00 
10  HH2  STS2 Standardgain  TG  100.00  0.00  90.00  15.00 
10  HH1  STS2 Standardgain  TG  100.00  0.00  0.00  15.00 
PDF, Last Month
PDF, Last Year
PDF, Month
PDF, Current Week
PDF, Year
Availability, Since 1972
Availability, 2 Month
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 threestep method to estimate instrument response parameters (poles, zeros, sensitivity and gain) and their associated errors using random calibration signals. First, we solve a coarse nonlinear 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 localminimum solution) caused by noise in the calibration records and enhances algorithm convergence. Second, we iteratively solve a nonlinear parameter estimation problem to obtain the least squares bestfit 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 2/3rdsoctave band centered at each bestfit pole/zero frequency. This procedure yields error estimates of the 99% confidence interval.
Loc  Chan  Cal Date  EpochSpan  Grade  Amp Nominal Error (dB)  Amp Best Fit Error (dB)  Phase Nominal Error (degree)  Phase Best Fit Error (degree)  Sensor  Cal Type 

10  BHZ  2012:172  2012:170 to No Ending Ti  A  0.015342  0.014156  0.11702  0.11458  STS2SG  Random 
00  BHZ  2012:171  2012:170 to No Ending T  A  0.015345  0.010715  0.13878  0.11808  STS1VBBE3  Random 
00  BH2  2012:171  2012:170 to No Ending T  A  0.014615  0.010557  0.14788  0.11726  STS1VBBE3  Random 
00  BH1  2012:171  2012:170 to No Ending T  A  0.015614  0.010422  0.14906  0.11853  STS1VBBE3  Random 

Current IssuesThe Slate has falied. A replacement is on the way.

20130924Router repaired and communication restored.

20120619The broken CMG3T was replaced by a STS2.

20080911Upgraded to Q330 digitizer.