United States National Seismic
Network
Probabilistic Noise
Plots
dB above NLNM
Maps: ANSS Stations
0.0625-0.125 sec
0.125-0.25 sec
0.25-0.5 sec
0.5-1.0 sec
1.0-2.0 sec
2.0-4.0 sec
4.0-8.0 sec
8.0-16.0 sec
16.0-32.0 sec
32.0-64.0 sec
64.0-128.0 sec
Return to Total PDFs
For a complete discussion of the USNSN noise analysis methods see
Ambient Noise Levels in North America, McNamara and Buland, BSSA,
preprint, 2003.
download PDF
Updated: 06-June-03
Maintained by: Dan McNamara
mcnamara@usgs.gov
USGS National Earthquake Information Center
URL http://gldbrick.cr.usgs.gov