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

DATES OF OPERATION:  	20 Aug 1990 to 20 Nov 1997.

SEISMOMETER TYPE AND ADC:
Strekeisen Model STS-1/VBB 3 component system.  ADC is Quanterra Model Q-52K.

DIGITAL FORMAT:
24 bit integer data words for all components with the exception of the mass position.  
channels.  Range: +8,388,607 to -8,388,608 counts.  Mass position channels have
16-bit integer data words.  Range: +32767 to -32768. 

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).