Seismic Network Operations

IU PTGA

Pitinga, Brazil

IU PTGA commences operations on: 1995,319

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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 24 Hours And More 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
10VHZStreckeisen STS-2 High-gainCG0.10-90.000.000.00
10VH2Streckeisen STS-2 High-gainCG0.100.0092.000.00
10VH1Streckeisen STS-2 High-gainCG0.100.002.000.00
10LHZStreckeisen STS-2 High-gainCG1.00-90.000.000.00
10LH2Streckeisen STS-2 High-gainCG1.000.0092.000.00
10LH1Streckeisen STS-2 High-gainCG1.000.002.000.00
10HHZStreckeisen STS-2 High-gainTG100.00-90.000.000.00
10HH2Streckeisen STS-2 High-gainTG100.000.0092.000.00
10HH1Streckeisen STS-2 High-gainTG100.000.002.000.00
10BHZStreckeisen STS-2 High-gainCG40.00-90.000.000.00
10BH2Streckeisen STS-2 High-gainCG40.000.0092.000.00
10BH1Streckeisen STS-2 High-gainCG40.000.002.000.00
20LNZKinemetrics FBA ES-T EpiSensor AccelerometerCG1.00-90.000.000.00
20LN2Kinemetrics FBA ES-T EpiSensor AccelerometerCG1.000.0090.000.00
20LN1Kinemetrics FBA ES-T EpiSensor AccelerometerCG1.000.000.000.00
20HNZKinemetrics FBA ES-T EpiSensor AccelerometerTG100.00-90.000.000.00
20HN2Kinemetrics FBA ES-T EpiSensor AccelerometerTG100.000.0090.000.00
20HN1Kinemetrics FBA ES-T EpiSensor AccelerometerTG100.000.000.000.00
00VHZGeotech KS-54000 Borehole SeismometerCG0.10-90.000.0096.00
00VH2Geotech KS-54000 Borehole SeismometerCG0.100.00219.0096.00
00VH1Geotech KS-54000 Borehole SeismometerCG0.100.00129.0096.00
00LHZGeotech KS-54000 Borehole SeismometerCG1.00-90.000.0096.00
00LH2Geotech KS-54000 Borehole SeismometerCG1.000.00219.0096.00
00LH1Geotech KS-54000 Borehole SeismometerCG1.000.00129.0096.00
00BHZGeotech KS-54000 Borehole SeismometerCG20.00-90.000.0096.00
00BH2Geotech KS-54000 Borehole SeismometerCG20.000.00219.0096.00
00BH1Geotech KS-54000 Borehole SeismometerCG20.000.00129.0096.00
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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
00BHZ2014:1252010:012 to No Ending TimeA1.06691.002413.006513.379654000Random
00BH12014:1252010:012 to No Ending TimeA1.27880.8300311.912212.403554000Random
00BH22014:1252010:012 to No Ending TimeA1.34480.7805612.258112.870154000Random
10BHZ2014:1262011:067 to No Ending TimeA0.0150280.015020.120180.076607STS-2-HGRandom
  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.