XMAS - Station Instrumentation

1. IRIS/USGS - GSN - [IU]: 22 Aug 1997 to Present

Seismometer Type:
Streckheisen Model STS-2 Hi gain VBB Triaxial components nominal 20000, Volt secounds/Meter sensitivity. ADC is Quanterra Model Q-680.

Digital Format:
24 bit integer data words for all broadband long period very long period and, ultra long period channels. Range 8388607 to -8388608 counts, 16 bit integer data words for 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.

Additional Information:
A detailed description of the IRIS-2 system can be found in Peterson, et al (1989).