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

DATES OF OPERATION:  	26 Nov 1991 to present.

SEISMOMETER TYPE AND ADC:
Geotech Model 36000-i three component borehole seismometer.  ADC is Martin Marietta EDME.

DIGITAL FORMAT:
24 bit integer data words for all components.  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).