1. Global Seismograph Network - GSN:  [ IU ]

DATES OF OPERATION:   22 Jan 1996 to Present.

SEISMOMETER TYPE:
Teledyne Geotech 54000 3 component borehole seismometer  ADC is Quanterra ModelQ-680.
Kinemetrics Model FBA-23 Low-Gain Sensor is used for acceleration channels.

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

EVENT DETECTOR ALGORITHM: 
The Murdock event detector (Murdock, 1991) is used for low-gain channels. 

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).