Seismic Network Operations

IU ANTO

Ankara, Turkey

IU ANTO commences operations on: 1992,269

Country Flag
Host: General Directorate of Disaster Affairs
Latitude: 39.868
Longitude: 32.793
Elevation: 1090
Datalogger: Q330
Broadband: KS-36000-I
Accelerometer: FBA_ES-T_EpiSensor_Accelerometer
Telemetry Status at the NEIC: Last Data In Less Than 10 Minutes
Station Photo Station Photo 

Vault Condition: Borehole seismometer system.

Site Geology: Hard rock

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
31LDOCI/PAS pressure sensorCW1.000.000.000.00
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
10LHZTrillium 240 broad bandCG1.00-90.000.000.00
10LH2Trillium 240 broad bandCG1.000.0090.000.00
10LH1Trillium 240 broad bandCG1.000.000.000.00
10VMWTrillium 240 broad bandCH0.100.000.000.00
10VMVTrillium 240 broad bandCH0.100.000.000.00
10HHZTrillium 240 broad bandTG100.00-90.000.000.00
10HH2Trillium 240 broad bandTG100.000.0090.000.00
10HH1Trillium 240 broad bandTG100.000.000.000.00
10BHZTrillium 240 broad bandCG40.00-90.000.000.00
10VMUTrillium 240 broad bandCH0.100.000.000.00
10VHZTrillium 240 broad bandCG0.10-90.000.000.00
10VH2Trillium 240 broad bandCG0.100.0090.000.00
10BH2Trillium 240 broad bandCG40.000.0090.000.00
10BH1Trillium 240 broad bandCG40.000.000.000.00
10VH1Trillium 240 broad bandCG0.100.000.000.00
00VMZGeotech KS-36000-I Borehole SeismometerCH0.100.000.00195.00
00VM2Geotech KS-36000-I Borehole SeismometerCH0.100.000.00195.00
00VM1Geotech KS-36000-I Borehole SeismometerCH0.100.000.00195.00
00VHZGeotech KS-36000-I Borehole SeismometerCG0.10-90.000.00195.00
00VH2Geotech KS-36000-I Borehole SeismometerCG0.100.0090.00195.00
00VH1Geotech KS-36000-I Borehole SeismometerCG0.100.000.00195.00
00LHZGeotech KS-36000-I Borehole SeismometerCG1.00-90.000.00195.00
00LH2Geotech KS-36000-I Borehole SeismometerCG1.000.0090.00195.00
00LH1Geotech KS-36000-I Borehole SeismometerCG1.000.000.00195.00
00BHZGeotech KS-36000-I Borehole SeismometerCG20.00-90.000.00195.00
00BH2Geotech KS-36000-I Borehole SeismometerCG20.000.0090.00195.00
00BH1Geotech KS-36000-I Borehole SeismometerCG20.000.000.00195.00
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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
10BHZ2014:1022010:315 to No Ending TimeA0.0108420.0076550.141710.089588TR240Random
00BHZ2014:1012010:314 to No Ending TimeA0.0528620.0123480.21790.2306436000IRandom
00BH22014:1012011:171 to No Ending TimeA0.0635040.0218310.191660.5727236000IRandom
00BH12014:1012010:314 to No Ending TimeA0.0548310.011720.239680.1639136000IRandom
  1. Current Issues
    The TR240 (location code 10) has high LP noise on horizontals. The KS36000 (location code 00) may have single ended output resulting in lowered response on LH2 channel.
  2. 2010-07-25
    Upgraded to Q330 digitizer.