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
PDF Mode
PDF 90th%

Dailey (diurnal) Variation by Station
PDF Mode
PDF 90th%

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  mcnamara@usgs.gov
USGS Advanced National Seismic System


URL http://geohazards.cr.usgs.gov