Seismic Network Operations


Pitinga, Brazil

IU PTGA commences operations on: 1995,319

Country Flag
Host: University of Brasilia
Latitude: -0.731
Longitude: -59.967
Elevation: 237
Datalogger: Q330
Broadband: KS-54000
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 surface vault is a concrete floored room. The pier rests on the floor.

Site Geology: Borehole drilled into a granitic intrusion.

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
20LNZFBA ES-T EpiSensor AccelerometerCG1.00-
20HNZFBA ES-T EpiSensor AccelerometerTG100.00-
10VHZSTS-2 High-gainCG0.10-
10LHZSTS-2 High-gainCG1.00-
10HHZSTS-2 High-gainTG100.00-
10BHZSTS-2 High-gainCG40.00-
20LN2FBA ES-T EpiSensor AccelerometerCG1.000.0090.000.00
20LN1FBA ES-T EpiSensor AccelerometerCG1.
20HN2FBA ES-T EpiSensor AccelerometerTG100.000.0090.000.00
20HN1FBA ES-T EpiSensor AccelerometerTG100.
10VH2STS-2 High-gainCG0.100.0092.000.00
10VH1STS-2 High-gainCG0.
10LH2STS-2 High-gainCG1.000.0092.000.00
10LH1STS-2 High-gainCG1.
10HH2STS-2 High-gainTG100.000.0092.000.00
10HH1STS-2 High-gainTG100.
10BH2STS-2 High-gainCG40.000.0092.000.00
10BH1STS-2 High-gainCG40.
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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
00BH12012:118 2009:310 to No Ending TiA0.00774410.00704050.0658270.074112 54000Random
00BH22012:118 2009:310 to No Ending TiA0.0134680.00780410.0606010.092126 54000Random
  1. Current Issues
    KS54000 is stuck in hole but providing some usable data (Z channel is inoperable). Need a return trip to blow the sand out and replace the seismometer.
  2. 2009-11-06
    Upgraded to Q330 digitizer.