Seismic Network Operations
IU RAR
Rarotonga, Cook Islands
IU RAR commences operations on: 1992,067
Host:  Institute of Geological and Nuclear Sciences 

Latitude:  21.212 
Longitude:  159.773 
Elevation:  28 
Datalogger:  Q330 
Broadband:  KS54000 
Accelerometer:  FBA_EST_EpiSensor_Accelerometer 
Telemetry Status at the NEIC:  Last Data In Less Than 10 Minutes 
Vault Condition: Borehole for Z, N, and E channels. The STS1/VBB seismometers are located in a small concrete building approximately 20 x 12 feet. Piers are not isolated from the floor, but are attached to surface rock. A small air conditioner inside the building controls temperature and humidity.
Site Geology: To about 85 meters geology is an alternating series of hard basalt and unstable flowing material, scoria, gravels and sands. Below 85 meters there is a consistent sequence of basalts.
Location Code  Channel Code  Instrument  Flags  Sample Rate  Dip  Azimuth  Depth 

20  LNZ  FBA EST EpiSensor Accelerometer  CG  1.00  90.00  0.00  0.00 
20  LN2  FBA EST EpiSensor Accelerometer  CG  1.00  0.00  90.00  0.00 
20  LN1  FBA EST EpiSensor Accelerometer  CG  1.00  0.00  0.00  0.00 
20  HNZ  FBA EST EpiSensor Accelerometer  TG  100.00  90.00  0.00  0.00 
20  HN2  FBA EST EpiSensor Accelerometer  TG  100.00  0.00  90.00  0.00 
20  HN1  FBA EST EpiSensor Accelerometer  TG  100.00  0.00  0.00  0.00 
00  VH2  KS54000  CG  0.10  0.00  76.00  101.00 
00  VHZ  KS54000  CG  0.10  90.00  0.00  101.00 
00  BH1  KS54000  CG  20.00  0.00  346.00  101.00 
00  VH1  KS54000  CG  0.10  0.00  346.00  101.00 
00  LHZ  KS54000  CG  1.00  90.00  0.00  101.00 
00  LH2  KS54000  CG  1.00  0.00  76.00  101.00 
00  LH1  KS54000  CG  1.00  0.00  346.00  101.00 
00  BHZ  KS54000  CG  20.00  90.00  0.00  101.00 
00  BH2  KS54000  CG  20.00  0.00  76.00  101.00 
10  VHZ  STS2 Highgain  CG  0.10  90.00  0.00  0.00 
10  VH2  STS2 Highgain  CG  0.10  0.00  90.00  0.00 
10  VH1  STS2 Highgain  CG  0.10  0.00  0.00  0.00 
10  LHZ  STS2 Highgain  CG  1.00  90.00  0.00  0.00 
10  LH2  STS2 Highgain  CG  1.00  0.00  90.00  0.00 
10  LH1  STS2 Highgain  CG  1.00  0.00  0.00  0.00 
10  HHZ  STS2 Highgain  TG  100.00  90.00  0.00  0.00 
10  HH2  STS2 Highgain  TG  100.00  0.00  90.00  0.00 
10  HH1  STS2 Highgain  TG  100.00  0.00  0.00  0.00 
10  BHZ  STS2 Highgain  CG  40.00  90.00  0.00  0.00 
10  BH2  STS2 Highgain  CG  40.00  0.00  90.00  0.00 
10  BH1  STS2 Highgain  CG  40.00  0.00  0.00  0.00 
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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 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  2012:115  2010:061 to No Ending T  A  0.014886  0.014838  0.1187  0.078267  STS2HG  Random 
00  BHZ  2012:114  2010:352 to No Ending T  A  0.041652  0.040228  0.38913  0.42073  54000  Random 
00  BH2  2012:114  2010:352 to No Ending T  A  0.02277  0.0092318  0.099051  0.13694  54000  Random 
00  BH1  2012:114  2010:352 to No Ending T  A  0.022784  0.0086213  0.35584  0.27398  54000  Random 

Current IssuesKS54000 is showing high noise levels.

20101218KS54000 seismometer replaced.

20100307Upgraded to Q330 digitizer. KS54000 failed.