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

DATES OF OPERATION:  	14 Jul 1995 to Present.

SEISMOMETER TYPE AND ADC:
Guralp CMG3-T Borehole Seismometer, Geotech KS-54000 Borehole Seismometer,
EDA FM-105B Fluxgate magnitometer, Vaisala PTA Microbarograph and
Teledyne-Geotech Microbarograph. ADC is Quanterra model QX80

DIGITAL FORMAT:
24 bit integer data words for all broad-band (20 sps), long period ( 1 sps), 
very long period (0.1 sps) and ultra long period (0.01 sps) channels.   
Range: +8,388,607 to -8,388,608 counts.  16 bit integer data words for ,
very short period (100 sps) mass position, and all environmental channels.  
Range: +32767 to -32768

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

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: Elevation of the 54000 is 1690 meters.  The 54000 is installed with 
a non-standard orientation.  The orientation portion of the SEED channel names
change from N and E to 1 and 2 (e.g. BHN changes to BH1) and vice-versa.
Please see the latest dataless seed volume for current information or contact
the Albuquerque Seismic Lab.

The Guralp CMG3-T Borehole Seismometer was removed on January 28, 1997.