1. Global Seismograph Network - GSN: IRIS -2 System

DATES OF OPERATION:  		18 Nov 1991 - Present.

SEISMOMETER TYPE AND ADC:
Streckeisen Model STS-1/VBB 3 component system.  ADC is Martin Marietta EDME.

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

EVENT DETECTOR ALGORITHM: None

Click on any of the following items for further information.

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

COMMENTS:
A description of the IRIS-2 system can be found in USGS Open-File Report 89-471, Peterson et al (1989).  
Due to its remote location a limited satellite transmission system has been
arranged whereby long-period data only (1 sps) is transmitted to the Albuquerque
Seismological Laboratory and is received within 24 hours of real time.  During 
the Antarctic summer, normally October through March, data is received at the 
ASL via data recorded during the Antarctic winter (BB, VLP. ULP) will not be 
available until the following October.