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

DATES OF OPERATION: 27 Feb 1999 to Present.

SEISMOMETER TYPE AND ADC: Streckeisen STS-1 seismometers for broad-band channels (00 location code). Guralp CMG3-T seismometer for higher frequency broad-band channels (10 location codes). Kinemetrics FBA-23 Low-Gain sensor (20 channels). ADC is a 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.

EVENT DETECTOR ALGORITHM: The Murdock/Hutt event detector (Murdock, 1991) is used for the HN? and BH?channels.