Seismic Network Operations

IU DWPF

Disney Wilderness Preserve, Florida, USA

IU DWPF commences operations on: 1998,214

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Host: The Nature Conservancy
Latitude: 28.11
Longitude: -81.433
Elevation: 30
Datalogger: Q330
Broadband: KS-54000
Accelerometer: FBA_ES-T_EpiSensor_Accelerometer
Telemetry Status at the NEIC: Last Data In Less Than 10 Minutes
Station Photo Station Photo Station Photo 

Vault Condition: Borehole depth is -162m.

Site Geology: Quaternary aged undifferentiated sands, clayey sands, marls, and peats. The layers are no more than 20 feet thick.

Location CodeChannel CodeInstrumentFlagsSample RateDipAzimuthDepth
00VMZGeotech KS-54000 Borehole SeismometerCH0.100.000.00162.00
10VMWTrillium 240 broad bandCH0.100.000.000.00
10VMVTrillium 240 broad bandCH0.100.000.000.00
10VMUTrillium 240 broad bandCH0.100.000.000.00
00VM2Geotech KS-54000 Borehole SeismometerCH0.100.000.00162.00
00VM1Geotech KS-54000 Borehole SeismometerCH0.100.000.00162.00
10VHZTrillium 240 broad bandCG0.10-90.000.000.00
00VHZGeotech KS-54000 Borehole SeismometerCG0.10-90.000.00162.00
10VH2Trillium 240 broad bandCG0.100.0087.000.00
00VH2Geotech KS-54000 Borehole SeismometerCG0.100.0041.00162.00
10VH1Trillium 240 broad bandCG0.100.00357.000.00
00VH1Geotech KS-54000 Borehole SeismometerCG0.100.00311.00162.00
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
10LHZTrillium 240 broad bandCG1.00-90.000.000.00
00LHZGeotech KS-54000 Borehole SeismometerCG1.00-90.000.00162.00
10LH2Trillium 240 broad bandCG1.000.0087.000.00
00LH2Geotech KS-54000 Borehole SeismometerCG1.000.0041.00162.00
10LH1Trillium 240 broad bandCG1.000.00357.000.00
00LH1Geotech KS-54000 Borehole SeismometerCG1.000.00311.00162.00
31LDOCI/PAS pressure sensorCW1.000.000.000.00
30LDOlower quality chip sensor in Setra boxCW1.000.000.000.00
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
10HHZTrillium 240 broad bandTG100.00-90.000.000.00
10HH2Trillium 240 broad bandTG100.000.0087.000.00
10HH1Trillium 240 broad bandTG100.000.00357.000.00
10BHZTrillium 240 broad bandCG40.00-90.000.000.00
00BHZGeotech KS-54000 Borehole SeismometerCG20.00-90.000.00162.00
10BH2Trillium 240 broad bandCG40.000.0087.000.00
00BH2Geotech KS-54000 Borehole SeismometerCG20.000.0041.00162.00
10BH1Trillium 240 broad bandCG40.000.00357.000.00
00BH1Geotech KS-54000 Borehole SeismometerCG20.000.00311.00162.00
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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
00BHZ2014:1222011:092 to No Ending TimeA0.0141360.00632510.0774970.05842254000Random
00BH12014:1222011:092 to No Ending TimeA0.016540.00646490.0793370.06386154000Random
00BH22014:1222011:092 to No Ending TimeA0.0122810.00631250.0747040.05883754000Random
10BHZ2014:1232012:176 to No Ending TimeA0.010590.00766220.137560.08708TR240Random
  1. 2012-06-23
    Episensor replace due to noise issues.
  2. 2010-10-09
    Upgraded to Q330 digitizer.