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

DATES OF OPERATION:  07 Sep 1993 to Present.

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

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

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