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: | KS-54000 |
| Accelerometer: | FBA_ES-T_EpiSensor_Accelerometer |
| Telemetry Status at the NEIC: |
 Last Data In Less Than 10 Minutes |
Vault Condition: Borehole for Z, N, and E channels. The STS-1/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 ES-T EpiSensor Accelerometer | CG | 1.00 | -90.00 | 0.00 | 0.00 |
| 20 | LN2 | FBA ES-T EpiSensor Accelerometer | CG | 1.00 | 0.00 | 90.00 | 0.00 |
| 20 | LN1 | FBA ES-T EpiSensor Accelerometer | CG | 1.00 | 0.00 | 0.00 | 0.00 |
| 20 | HNZ | FBA ES-T EpiSensor Accelerometer | TG | 100.00 | -90.00 | 0.00 | 0.00 |
| 20 | HN2 | FBA ES-T EpiSensor Accelerometer | TG | 100.00 | 0.00 | 90.00 | 0.00 |
| 20 | HN1 | FBA ES-T EpiSensor Accelerometer | TG | 100.00 | 0.00 | 0.00 | 0.00 |
| 00 | VH2 | KS-54000 | CG | 0.10 | 0.00 | 76.00 | 101.00 |
| 00 | VHZ | KS-54000 | CG | 0.10 | -90.00 | 0.00 | 101.00 |
| 00 | BH1 | KS-54000 | CG | 20.00 | 0.00 | 346.00 | 101.00 |
| 00 | VH1 | KS-54000 | CG | 0.10 | 0.00 | 346.00 | 101.00 |
| 00 | LHZ | KS-54000 | CG | 1.00 | -90.00 | 0.00 | 101.00 |
| 00 | LH2 | KS-54000 | CG | 1.00 | 0.00 | 76.00 | 101.00 |
| 00 | LH1 | KS-54000 | CG | 1.00 | 0.00 | 346.00 | 101.00 |
| 00 | BHZ | KS-54000 | CG | 20.00 | -90.00 | 0.00 | 101.00 |
| 00 | BH2 | KS-54000 | CG | 20.00 | 0.00 | 76.00 | 101.00 |
| 10 | VHZ | STS-2 High-gain | CG | 0.10 | -90.00 | 0.00 | 0.00 |
| 10 | VH2 | STS-2 High-gain | CG | 0.10 | 0.00 | 90.00 | 0.00 |
| 10 | VH1 | STS-2 High-gain | CG | 0.10 | 0.00 | 0.00 | 0.00 |
| 10 | LHZ | STS-2 High-gain | CG | 1.00 | -90.00 | 0.00 | 0.00 |
| 10 | LH2 | STS-2 High-gain | CG | 1.00 | 0.00 | 90.00 | 0.00 |
| 10 | LH1 | STS-2 High-gain | CG | 1.00 | 0.00 | 0.00 | 0.00 |
| 10 | HHZ | STS-2 High-gain | TG | 100.00 | -90.00 | 0.00 | 0.00 |
| 10 | HH2 | STS-2 High-gain | TG | 100.00 | 0.00 | 90.00 | 0.00 |
| 10 | HH1 | STS-2 High-gain | TG | 100.00 | 0.00 | 0.00 | 0.00 |
| 10 | BHZ | STS-2 High-gain | CG | 40.00 | -90.00 | 0.00 | 0.00 |
| 10 | BH2 | STS-2 High-gain | CG | 40.00 | 0.00 | 90.00 | 0.00 |
| 10 | BH1 | STS-2 High-gain | CG | 40.00 | 0.00 | 0.00 | 0.00 |
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 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.
| Loc | Chan | Cal Date | Epoch-Span | 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 | STS-2-HG | 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 IssuesKS-54000 is showing high noise levels.
-
2010-12-18KS-54000 seismometer replaced.
-
2010-03-07Upgraded to Q330 digitizer. KS-54000 failed.
