Seismic Network Operations
IU SDV
Santo Domingo, Venezuela
IU SDV commences operations on: 1994,231
Host:  Venezuelan Foundation for Seismological Investigations 

Latitude:  8.884 
Longitude:  70.634 
Elevation:  1620 
Datalogger:  Q330 
Broadband:  STS1VBB_w/E300 
Accelerometer:  FBA_EST_EpiSensor_Accelerometer 
Telemetry Status at the NEIC:  Last Data In Less Than 10 Minutes 
Vault Condition: The vault is located in the buttress of a hydro electric dam. Noise related to the dam may be high occasionally.
Location Code  Channel Code  Instrument  Flags  Sample Rate  Dip  Azimuth  Depth 

20  LNZ  FBA EST EpiSensor Accelerometer  CG  1.00  90.00  0.00  30.00 
20  LN2  FBA EST EpiSensor Accelerometer  CG  1.00  0.00  90.00  30.00 
20  LN1  FBA EST EpiSensor Accelerometer  CG  1.00  0.00  0.00  30.00 
10  VHZ  CMG3T  CG  0.10  90.00  0.00  31.00 
10  VH2  CMG3T  CG  0.10  0.00  89.00  31.00 
10  VH1  CMG3T  CG  0.10  0.00  359.00  31.00 
10  LHZ  CMG3T  CG  1.00  90.00  0.00  31.00 
10  LH2  CMG3T  CG  1.00  0.00  89.00  31.00 
10  LH1  CMG3T  CG  1.00  0.00  359.00  31.00 
10  BHZ  CMG3T  CG  40.00  90.00  0.00  31.00 
10  BH2  CMG3T  CG  40.00  0.00  89.00  31.00 
10  BH1  CMG3T  CG  40.00  0.00  359.00  31.00 
00  VHZ  STS1VBB w/E300  CG  0.10  90.00  0.00  32.00 
00  VH2  STS1VBB w/E300  CG  0.10  0.00  87.00  32.00 
00  VH1  STS1VBB w/E300  CG  0.10  0.00  357.00  32.00 
00  LHZ  STS1VBB w/E300  CG  1.00  90.00  0.00  32.00 
00  LH2  STS1VBB w/E300  CG  1.00  0.00  87.00  32.00 
00  LH1  STS1VBB w/E300  CG  1.00  0.00  357.00  32.00 
00  BHZ  STS1VBB w/E300  CG  20.00  90.00  0.00  32.00 
00  BH2  STS1VBB w/E300  CG  20.00  0.00  87.00  32.00 
00  BH1  STS1VBB w/E300  CG  20.00  0.00  357.00  32.00 
20  HNZ  FBA EST EpiSensor Accelerometer  TG  100.00  90.00  0.00  30.00 
20  HN2  FBA EST EpiSensor Accelerometer  TG  100.00  0.00  90.00  30.00 
20  HN1  FBA EST EpiSensor Accelerometer  TG  100.00  0.00  0.00  30.00 
10  HHZ  CMG3T  TG  100.00  90.00  0.00  31.00 
10  HH2  CMG3T  TG  100.00  0.00  89.00  31.00 
10  HH1  CMG3T  TG  100.00  0.00  359.00  31.00 
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Availability, Since 1972
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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. Â The USGS analyzes the random binary calibration signal in order to estimate the instrument response. Â 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  BHZ  2012:110  2011:213 to No Ending Ti  A  0.031897  0.0094897  0.21867  0.15516  STS1VBBE3  Random 
00  BH2  2012:110  2011:213 to No Ending Ti  A  0.01982  0.010364  0.1786  0.12889  STS1VBBE3  Random 
00  BH1  2012:110  2011:213 to No Ending Ti  A  0.16835  0.01452  0.66106  0.55918  STS1VBBE3  Random 

Current IssuesThe CMG3T has elevated LP noise which appears to correlate with local dam activity. The Z and 1 components on the STS1 have overdamped responses.

20100121Upgraded to Q330 digitizer.