Seismic Network Operations
IU SAML
Samuel, Brazil
IU SAML commences operations on: 2003,125
Host:  University of Brasilia 

Latitude:  8.949 
Longitude:  63.183 
Elevation:  120 
Datalogger:  Q330 
Broadband:  KS54000 
Accelerometer:  FBA_EST_EpiSensor_Accelerometer 
Telemetry Status at the NEIC:  Last Data In Less Than 10 Minutes 
Location Code  Channel Code  Instrument  Flags  Sample Rate  Dip  Azimuth  Depth 

20  LNZ  Kinemetrics FBA EST EpiSensor Accelerometer  CG  1.00  90.00  0.00  0.00 
20  LN2  Kinemetrics FBA EST EpiSensor Accelerometer  CG  1.00  0.00  90.00  0.00 
20  LN1  Kinemetrics FBA EST EpiSensor Accelerometer  CG  1.00  0.00  0.00  0.00 
20  HNZ  Kinemetrics FBA EST EpiSensor Accelerometer  TG  100.00  90.00  0.00  0.00 
20  HN2  Kinemetrics FBA EST EpiSensor Accelerometer  TG  100.00  0.00  90.00  0.00 
20  HN1  Kinemetrics FBA EST EpiSensor Accelerometer  TG  100.00  0.00  0.00  0.00 
10  VMW  Streckeisen STS2 Highgain  CH  0.10  0.00  0.00  0.00 
10  VMV  Streckeisen STS2 Highgain  CH  0.10  0.00  0.00  0.00 
10  VMU  Streckeisen STS2 Highgain  CH  0.10  0.00  0.00  0.00 
10  VHZ  Streckeisen STS2 Highgain  CG  0.10  90.00  0.00  0.00 
10  VH2  Streckeisen STS2 Highgain  CG  0.10  0.00  90.00  0.00 
10  VH1  Streckeisen STS2 Highgain  CG  0.10  0.00  0.00  0.00 
10  LHZ  Streckeisen STS2 Highgain  CG  1.00  90.00  0.00  0.00 
10  LH2  Streckeisen STS2 Highgain  CG  1.00  0.00  90.00  0.00 
10  LH1  Streckeisen STS2 Highgain  CG  1.00  0.00  0.00  0.00 
10  HHZ  Streckeisen STS2 Highgain  TG  100.00  90.00  0.00  0.00 
10  HH2  Streckeisen STS2 Highgain  TG  100.00  0.00  90.00  0.00 
10  HH1  Streckeisen STS2 Highgain  TG  100.00  0.00  0.00  0.00 
10  BHZ  Streckeisen STS2 Highgain  CG  40.00  90.00  0.00  0.00 
10  BH2  Streckeisen STS2 Highgain  CG  40.00  0.00  90.00  0.00 
10  BH1  Streckeisen STS2 Highgain  CG  40.00  0.00  0.00  0.00 
00  VHZ  Geotech KS54000 Borehole Seismometer  CG  0.10  90.00  0.00  111.00 
00  VH2  Geotech KS54000 Borehole Seismometer  CG  0.10  0.00  185.00  111.00 
00  VH1  Geotech KS54000 Borehole Seismometer  CG  0.10  0.00  95.00  111.00 
00  LHZ  Geotech KS54000 Borehole Seismometer  CG  1.00  90.00  0.00  111.00 
00  LH2  Geotech KS54000 Borehole Seismometer  CG  1.00  0.00  185.00  111.00 
00  LH1  Geotech KS54000 Borehole Seismometer  CG  1.00  0.00  95.00  111.00 
00  BHZ  Geotech KS54000 Borehole Seismometer  CG  20.00  90.00  0.00  111.00 
00  BH2  Geotech KS54000 Borehole Seismometer  CG  20.00  0.00  185.00  111.00 
00  BH1  Geotech KS54000 Borehole Seismometer  CG  20.00  0.00  95.00  111.00 
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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 

00  BH1  2013:234  2011:048 to No Ending Time  A  0.0064559  0.0058236  0.064503  0.057725  54000  Random 
00  BHZ  2013:234  2011:048 to No Ending Time  A  0.015267  0.0063053  0.20833  0.16352  54000  Random 
00  BH2  2013:234  2011:048 to No Ending Time  A  0.014628  0.0059374  0.072386  0.062836  54000  Random 

Current IssuesNew KS54000 was sent to SAML 31010 but was damaged in shipment and it needs to be replaced as well. The vertical and east channels are very noisy in the higher frequencies and the vertical sensitivity is a fraction of what it should be. The STS2 is also very noisy.

20130730Power system repaired and VSAT communications restored.

20091114Upgraded to Q330 digitizer.