HR: 0800h
AN: S21A-0265    [Abstracts]
TI: ANSS Backbone Station Installation and Site Characterization
AU: * Meremonte, M
EM: meremonte@usgs.gov
AF: USGS - ANSS, 1711 Illinois St., Golden, CO 80401 United States
AU: Leeds, A
EM: aleeds@usgs.gov
AF: USGS - ANSS, 1711 Illinois St., Golden, CO 80401 United States
AU: Overturf, D
EM: overturf@usgs.gov
AF: USGS - ANSS, 1711 Illinois St., Golden, CO 80401 United States
AU: McMillian, J
EM: mcmillian@usgs.gov
AF: USGS - ANSS, 1711 Illinois St., Golden, CO 80401 United States
AU: Allen, J
EM: jallen@usgs.gov
AF: USGS - ANSS, 1711 Illinois St., Golden, CO 80401 United States
AU: McNamara, D
EM: mcnamara@usgs.gov
AF: USGS - ANSS, 1711 Illinois St., Golden, CO 80401 United States
AB: During 2004 several new broadband seismic stations have been deployed as a part of the USGS's Advanced National Seismic System (ANSS) backbone and regional networks. New stations include: ERPA, MNTX, OGLA, AMTX, NATX, KCCO, BMO, MARC, TZTN, LAO, DGMT, REDW, KSU1, MOOW, TPAW, LOHW, RAMW. Permanent station locations were chosen to minimize the local noise conditions by recording continuous data and using a quantitative analysis of the statistical distribution of noise power estimates. For each one-hour segment of continuous data, a power spectral density (PSD) is estimated and smoothed in full octave averages at 1/8 octave intervals. Powers for each 1/8 period interval were then accumulated in one dB power bins. A statistical analysis of power bins yields probability density functions (PDFs) as a function of noise power for each of the octave bands at each station and component. Examination of earthquake signal, artifacts related to station operation and episodic cultural noise in the PDFs allow us to estimate both the overall station quality and the level of earth noise at each potential backbone site. The main function of a seismic network, such as the ANSS, is to provide high quality data for earthquake monitoring, source studies, and Earth structure research. The utility of seismic data is greatly increased when noise levels are reduced. A good quantification and understanding of seismic noise is a first step at reducing noise levels in seismic data and improving overall data quality from the ANSS backbone network.
DE: 7294 Instruments and techniques
DE: 7299 General or miscellaneous
SC: Seismology [S]
MN: 2004 AGU Fall Meeting