Seismic Network Operations
IU TUC
Tucson, Arizona
IU TUC commences operations on: 1992,165
Host:  University of Arizona 

Latitude:  32.31 
Longitude:  110.785 
Elevation:  910 
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: Vault is located in a small building which is well insulated against the summer heat. Piers are isolated from the floor and attached to bedrock. No air conditioners were in use during installation. Temperature variation in the vault is unknown.
Site Geology: Seismometers are located in foothills of the Santa Catalina mountains on granite.
Location Code  Channel Code  Instrument  Flags  Sample Rate  Dip  Azimuth  Depth 

00  VHZ  STS1VBB w/E300  CG  0.10  90.00  0.00  1.00 
00  VH2  STS1VBB w/E300  CG  0.10  0.00  91.00  1.00 
00  VH1  STS1VBB w/E300  CG  0.10  0.00  1.00  1.00 
00  LHZ  STS1VBB w/E300  CG  1.00  90.00  0.00  1.00 
00  LH2  STS1VBB w/E300  CG  1.00  0.00  91.00  1.00 
00  LH1  STS1VBB w/E300  CG  1.00  0.00  1.00  1.00 
00  BHZ  STS1VBB w/E300  CG  20.00  90.00  0.00  1.00 
00  BH2  STS1VBB w/E300  CG  20.00  0.00  91.00  1.00 
00  BH1  STS1VBB w/E300  CG  20.00  0.00  1.00  1.00 
20  LNZ  FBA EST EpiSensor Accelerometer  CG  1.00  90.00  0.00  1.00 
20  LN2  FBA EST EpiSensor Accelerometer  CG  1.00  0.00  90.00  1.00 
20  LN1  FBA EST EpiSensor Accelerometer  CG  1.00  0.00  0.00  1.00 
20  HNZ  FBA EST EpiSensor Accelerometer  TG  100.00  90.00  0.00  1.00 
20  HN2  FBA EST EpiSensor Accelerometer  TG  100.00  0.00  90.00  1.00 
20  HN1  FBA EST EpiSensor Accelerometer  TG  100.00  0.00  0.00  1.00 
10  VHZ  CMG3T  CG  0.10  90.00  0.00  1.00 
10  VH2  CMG3T  CG  0.10  0.00  89.00  1.00 
10  VH1  CMG3T  CG  0.10  0.00  359.00  1.00 
10  LHZ  CMG3T  CG  1.00  90.00  0.00  1.00 
10  LH2  CMG3T  CG  1.00  0.00  89.00  1.00 
10  LH1  CMG3T  CG  1.00  0.00  359.00  1.00 
10  HHZ  CMG3T  TG  100.00  90.00  0.00  1.00 
10  HH2  CMG3T  TG  100.00  0.00  89.00  1.00 
10  HH1  CMG3T  TG  100.00  0.00  359.00  1.00 
10  BHZ  CMG3T  CG  40.00  90.00  0.00  1.00 
10  BH2  CMG3T  CG  40.00  0.00  89.00  1.00 
10  BH1  CMG3T  CG  40.00  0.00  359.00  1.00 
30  LDO  CI/PAS pressure sensor  CW  1.00  0.00  0.00  0.00 
PDF, Last Month
PDF, Last Year
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PDF, Current Week
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Availability, Since 1972
Availability, 2 Month
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 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 

10  BHZ  2011:181  2010:355 to No Ending Ti  A  0.01257  0.010256  0.078552  0.064998  CMG3T  Random 
00  BH2  2011:181  2011:180 to No Ending T  A  0.026976  0.00919  0.14802  0.20999  STS1VBBE3  Random 
00  BHZ  2011:181  2011:180 to No Ending T  A  0.017312  0.0082957  0.13934  0.16957  STS1VBBE3  Random 
10  BH1  2011:181  2010:355 to No Ending Ti  A  0.016092  0.012041  0.13181  0.072919  CMG3T  Random 
10  BH2  2011:181  2010:355 to No Ending Ti  A  0.012899  0.0099766  0.09885  0.064115  CMG3T  Random 
00  BH1  2011:181  2011:180 to No Ending T  A  0.019026  0.008333  0.13914  0.17607  STS1VBBE3  Random 

Current IssuesEpisensors keep failing at this site. We will run two simultaneously to monitor. The 00LH2 channel is showing intermittent lowered sensitivity as of early December.

20100924Replaced cell modem which failed on Aug. 16 2010.

20090529Upgraded to Q330 digitizer.