1. Global Seismograph Network - GSN:  IRIS-2 System  [ IU ]

DATES OF OPERATION:  		08 Jun 1992 to present.

SEISMOMETER TYPE AND ADC:
Streckeisen Model STS-1/VBB 3 component system. Geotech Model Gs-13 seismometers
for the short period (80sps) components.   ADC is Quanterra Model Q-680.

DIGITAL FORMAT:
24 bit integer data words for all components except for very short period data  
(100 sps).   Range:  +8,388,607 to -8,388,608 counts.  Very short period data 
has 16 bit integer data words.  Range: +32767 to -32768 counts.

EVENT DETECTOR ALGORITHM:
The Murdock event detector (Murdock, 1991) is used for the short period data.

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 detailed description of the IRIS-2 system can be found in Peterson et al. (1989).