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

DATES OF OPERATION:  	21 Mar 1995 to 14 Jul 1995.

SEISMOMETER TYPE and ADC
Geotech KS-54000 Borehole Seismometer, GS-13 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 ALGORITHIM:  
The Murdock event detector (Murdock 1983) was installed on 03 May 1983.

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:  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.