1. Global Seismograph Network - GSN: IRIS -2 System
DATES OF OPERATION: 3 Mar 2004 to Present.
SEISMOMETER TYPE AND ADC: Streckeisen STS-1 vertical instrument for broad-band vertical channels (00 location codes). Streckeisen STS-2 seismometer for for higher sample rate broad-band channels (10 location codes). Kinemetrics FBA-23 Low-Gain sensor for 10 channels. ADC Quanterra Q-680, 12 channel.
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) channels. Range: +8,388,607 to -8,388,608 counts. 24-bit integer data words for very short period (80 sps) data continuous very short period (40 sps) data.
EVENT DETECTOR ALGORITHM: The Murdock/Hutt event detector (Murdock, 1991) is used for the HN? and BH? channels.