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

DATES OF OPERATION:  		16 Mar 1993 - Present.

SEISMOMETER TYPE AND ADC:
Streckeisen Model STS-1/VBB 3 component system.  ADC is Quanterra Model Q-680.
The Kinemetrics FBA-23 Low-Gain Sensor is used for very short period data.

DIGITAL FORMAT:
24 bit integer data words for all broadband (20 sps), long period (1 sps), 
very long period (0.1 sps), and ultra long period (0.01 sps) components.
Range: +8,388,607 to -8,388,608 counts.  16 bit integer data words for very
short period data.  Range +32767 to -32768 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 description of the IRIS-2 system can be found in USGS Open-File Report 89-471, Peterson et al (1989).