USGS/ANSS Backbone Noise Monitor
Click on a station to view PDF plots ImageMap - turn on images!!!

ANSS Backbone Noise: Maps, Plots and movies

Animated Power Sprecta Distribution

US National Noise Maps by Period

Global Noise Maps by Period 

Seasonal (secular) Variation by Station
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Dailey (diurnal) Variation by Station
PDF Mode
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Backbone Installation Noise Tests: PDF plots

Additional Noise PDFs available at the IRIS DMC
Permanent worldwide networks (II, IU, IM, UW, GE, GR, ...)
USarray stations
Methods and Interpretation of the noise PDFs

Updated: 05-Dec-04
Maintained by: Dan McNamara
USGS Advanced National Seismic System