Seismic Network Operations

IU LSZ

Lusaka, Zambia

IU LSZ commences operations on: 1994,217

Country Flag
Host: Zambia Geological Survey
Latitude: -15.278
Longitude: 28.188
Elevation: 1200
Datalogger: Q330
Broadband: STS-1H/VBB
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 constructed of concrete. The isolated pier is also constructed of concrete and is attached to granite.

Site Geology: Granite

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
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
10VHZStreckeisen STS-2 High-gainCG0.10-90.000.000.00
10VH2Streckeisen STS-2 High-gainCG0.100.0090.000.00
10VH1Streckeisen STS-2 High-gainCG0.100.000.000.00
10LHZStreckeisen STS-2 High-gainCG1.00-90.000.000.00
10LH2Streckeisen STS-2 High-gainCG1.000.0090.000.00
10LH1Streckeisen STS-2 High-gainCG1.000.000.000.00
10BHZStreckeisen STS-2 High-gainCG40.00-90.000.000.00
10BH2Streckeisen STS-2 High-gainCG40.000.0090.000.00
10BH1Streckeisen STS-2 High-gainCG40.000.000.000.00
00VHZStreckeisen STS-1H/VBB SeismometerCG0.10-90.000.000.00
00VH2Streckeisen STS-1H/VBB SeismometerCG0.100.0090.000.00
00VH1Streckeisen STS-1H/VBB SeismometerCG0.100.000.000.00
00LHZStreckeisen STS-1H/VBB SeismometerCG1.00-90.000.000.00
00LH2Streckeisen STS-1H/VBB SeismometerCG1.000.0090.000.00
00LH1Streckeisen STS-1H/VBB SeismometerCG1.000.000.000.00
00BHZStreckeisen STS-1H/VBB SeismometerCG20.00-90.000.000.00
00BH2Streckeisen STS-1H/VBB SeismometerCG20.000.0090.000.00
00BH1Streckeisen STS-1H/VBB SeismometerCG20.000.000.000.00
10VMWStreckeisen STS-2 High-gainCH0.100.000.000.00
10VMVStreckeisen STS-2 High-gainCH0.100.000.000.00
10VMUStreckeisen STS-2 High-gainCH0.100.000.000.00
00VMZStreckeisen STS-1V/VBB SeismometerCH0.100.000.000.00
00VM2Streckeisen STS-1H/VBB SeismometerCH0.100.000.000.00
00VM1Streckeisen STS-1H/VBB SeismometerCH0.100.000.000.00
30LDOIU Paroscientific MicrobarographCW1.000.000.000.00
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
10HHZStreckeisen STS-2 High-gainTG100.00-90.000.000.00
10HH2Streckeisen STS-2 High-gainTG100.000.0090.000.00
10HH1Streckeisen STS-2 High-gainTG100.000.000.000.00
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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
00BHZ2013:1332009:342 to No Ending TimeA0.0112890.00929410.091520.097557STS1HVBBRandom
10BHZ2013:1342010:351 to No Ending TimeA0.014320.0142130.119010.10738STS-2-HGRandom
00BH22013:1332009:343 to No Ending TimeA0.0121310.0088790.0958970.125STS1HVBBRandom
00BH12013:1332009:343 to No Ending TimeA0.0128440.00897580.0922550.11879STS1HVBBRandom
  1. Current Issues
    Long period noise on the STS-1 N-S sensor.
  2. 2008-09-08
    Upgraded to Q330 digitizer.