Seismic Network Operations

IU SDV

Santo Domingo, Venezuela

IU SDV commences operations on: 1994,231

Country Flag
Host: Venezuelan Foundation for Seismological Investigations
Latitude: 8.884
Longitude: -70.634
Elevation: 1620
Datalogger: Q330
Broadband: STS-1VBB_w/E300
Accelerometer: FBA_ES-T_EpiSensor_Accelerometer
Telemetry Status at the NEIC: Last Data In Less Than 10 Minutes
Station Photo Station Photo Station Photo Station Photo 

Vault Condition: The vault is located in the buttress of a hydro electric dam. Noise related to the dam may be high occasionally.

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
20LNZKinemetrics FBA ES-T EpiSensor AccelerometerCG1.00-90.000.0030.00
20LN1Kinemetrics FBA ES-T EpiSensor AccelerometerCG1.000.000.0030.00
20HNZKinemetrics FBA ES-T EpiSensor AccelerometerTG100.00-90.000.0030.00
20HN1Kinemetrics FBA ES-T EpiSensor AccelerometerTG100.000.000.0030.00
10VHZGuralp CMG3-T SeismometerCG0.10-90.000.0031.00
10LHZGuralp CMG3-T SeismometerCG1.00-90.000.0031.00
10HHZGuralp CMG3-T SeismometerTG100.00-90.000.0031.00
10BHZGuralp CMG3-T SeismometerCG40.00-90.000.0031.00
00VHZStreckeisen STS-1VBB w/E300CG0.10-90.000.0032.00
00LHZStreckeisen STS-1VBB w/E300CG1.00-90.000.0032.00
00BHZStreckeisen STS-1VBB w/E300CG20.00-90.000.0032.00
00VH2Streckeisen STS-1VBB w/E300CG0.100.0087.0032.00
00LH2Streckeisen STS-1VBB w/E300CG1.000.0087.0032.00
00BH2Streckeisen STS-1VBB w/E300CG20.000.0087.0032.00
10VH2Guralp CMG3-T SeismometerCG0.100.0089.0031.00
10LH2Guralp CMG3-T SeismometerCG1.000.0089.0031.00
10HH2Guralp CMG3-T SeismometerTG100.000.0089.0031.00
10BH2Guralp CMG3-T SeismometerCG40.000.0089.0031.00
20LN2Kinemetrics FBA ES-T EpiSensor AccelerometerCG1.000.0090.0030.00
20HN2Kinemetrics FBA ES-T EpiSensor AccelerometerTG100.000.0090.0030.00
00VH1Streckeisen STS-1VBB w/E300CG0.100.00357.0032.00
00LH1Streckeisen STS-1VBB w/E300CG1.000.00357.0032.00
00BH1Streckeisen STS-1VBB w/E300CG20.000.00357.0032.00
10VH1Guralp CMG3-T SeismometerCG0.100.00359.0031.00
10LH1Guralp CMG3-T SeismometerCG1.000.00359.0031.00
10HH1Guralp CMG3-T SeismometerTG100.000.00359.0031.00
10BH1Guralp CMG3-T SeismometerCG40.000.00359.0031.00
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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
10BH12014:1132010:017 to No Ending TimeD0.413180.3401211.053710.0624CMG3-TRandom
10BH22014:1132010:017 to No Ending TimeC0.166250.143180.949291.4373CMG3-TRandom
10BHZ2014:1132010:017 to No Ending TimeC0.123270.107670.747140.74098CMG3-TRandom
00BH22014:1122012:110 to No Ending TimeA0.0231010.00810760.186110.20885STS1VBBE3Random
00BHZ2014:1122013:167 to No Ending TimeA0.0256220.00776620.201480.16964STS1VBBE3Random
00BH12014:1122012:110 to No Ending TimeA0.156790.0160390.636140.43168STS1VBBE3Random
  1. Current Issues
    The CMG3-T has elevated LP noise which appears to correlate with local dam activity. The Z and 1 components on the STS-1 have overdamped responses.
  2. 2010-01-21
    Upgraded to Q330 digitizer.