1.  Global Telemetered Seismograph Network - GTSN: [ GT ]  

DATES OF OPERATION:   28 Dec 1993 to Present.

SEISMOMETER TYPE & ADC:
Geotech/Teledyne Model 54000 three component borehole seismometer.  A Geotech/Teledyne 
Model GS-21 vertical component only borehole seismometer is used to furnish a second
channel of vertical short-period data.  ADC is Quanterra Model Q-680/VX-GC-A8.

DIGITAL FORMAT:
24 bit integer data words for all components.  Range: +8,388,607 to -8,388,608 counts.

EVENT DETECTION ALGORITHM:  None.

Click on any of the following items for further information.

• Channel Data
• Amplitude Response to Ground Motion
• Seismic Noise Study graph information
  • Seismic Noise Level - Annual
  • Seismic Noise Level - Seasonal/Diurnal

COMMENTS
All data from VNDA is telemetered to the Albuquerque Seismological Laboratory in real time.  
The IRIS DMC will have this data available for distribution immediately after major events.
If additional information on the geophysical channels is required please contact ASL.

SBA will be used as an on-line backup system if VNDA becomes inoperative.