DATES OF OPERATION: 23 Oct 1999 to 17 Dec 2003

SEISMOMETER TYPE AND ADC:
Geotech KS54000 borehole seismometer for broad-band channels (00 location code). ADC Quanterra Q-680, 12 channel system.

DATES OF OPERATION: 17 Dec 2003 to Present

SEISMOMETER TYPE AND ADC:
Streckeisen STS-2 seismometer for for broad-band channels (00 location codes).
ADC Quanterra Q-680, 12 channel system.

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 HH? channels.