1. Global Seismograph Network - GSN: 

DATES OF OPERATION:  	20 Nov 1997 to Present.

SEISMOMETER TYPE AND ADC:
Streckeisen STS-1 very broad band seismometer and Kinemetrics FBA-23 
low-gain accelerometer. ADC is Quanterra QX80.

DIGITAL FORMAT:
24 bit integer data words for all broadband, long period, very long period and
ultra long period channels.  Range: +8,388,607 to -8,388,608 counts 8 bit integer 
data words for mass position and all environmental channels.
Range:  0 to 1024

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

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).