Noise Levels at Different Periods
The table below gives the decibel 10% noise level (in db) for each month in
several period bands. The 10% noise level is defined as the signal
level not exceeded 10% of the time, based on hourly measurements. Each entry in the
table is color coded with reference to the New Low Noise Model (NLNM, Peterson, 1993):
navy, -6 db < value-NLNM < -3 db
blue, -3 db < value-NLNM < 3 db
aqua, 3 db < value-NLNM < 6 db
lime, 6 db < value-NLNM < 9 db
yellow, 9 db < value-NLNM < 12 db
orange, 12 db < value-NLNM < 15 db
red, 15 db < value-NLNM < 20 db
fuchsia, 20 db < value-NLNM < 25 db
silver, value-NLNM < -6 db, value-NLNM > 25 db
Black indicates that there was an insufficient number of hourly measurements to calculate a noise level.
| Month | Chan. | Qual. | # obs. | 268s | 228s | 193s | 164s | 139s | 118s | 100s | 85s | 72s | 61s | 52s | 44s | 37s | 32s | 27s | 23s | 19s | 16s | 14s | 12s | 10s |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 201105 | LHZ | AR | 46 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 201104 | LHZ | AR | 720 | -176 | -177 | -178 | -179 | -180 | -180 | -180 | -181 | -181 | -182 | -182 | -181 | -180 | -179 | -176 | -172 | -163 | -157 | -156 | -158 | -154 |
| 201103 | LHZ | AR | 744 | -177 | -178 | -179 | -180 | -180 | -180 | -180 | -181 | -182 | -182 | -182 | -181 | -180 | -179 | -175 | -170 | -162 | -156 | -155 | -155 | -153 |
| 201102 | LHZ | AR | 672 | -176 | -178 | -179 | -179 | -180 | -180 | -180 | -181 | -182 | -182 | -182 | -181 | -180 | -178 | -175 | -170 | -162 | -155 | -153 | -154 | -151 |
| 201101 | LHZ | AR | 744 | -175 | -176 | -177 | -178 | -178 | -179 | -179 | -180 | -181 | -181 | -182 | -181 | -180 | -179 | -175 | -170 | -161 | -155 | -152 | -152 | -147 |
| 201012 | LHZ | AR | 744 | -174 | -176 | -177 | -178 | -179 | -180 | -181 | -181 | -182 | -183 | -182 | -182 | -180 | -179 | -176 | -174 | -166 | -158 | -153 | -153 | -153 |
| 201011 | LHZ | AR | 720 | -172 | -174 | -175 | -177 | -178 | -179 | -179 | -180 | -181 | -181 | -181 | -181 | -180 | -179 | -176 | -173 | -164 | -157 | -153 | -153 | -151 |
| 201010 | LHZ | AR | 742 | -174 | -176 | -177 | -179 | -179 | -180 | -180 | -181 | -182 | -182 | -182 | -181 | -180 | -179 | -177 | -173 | -165 | -157 | -155 | -155 | -152 |
| 201009 | LHZ | AR | 717 | -174 | -176 | -177 | -178 | -179 | -180 | -180 | -181 | -181 | -181 | -181 | -180 | -180 | -178 | -176 | -172 | -164 | -158 | -156 | -159 | -156 |
| 201008 | LHZ | AR | 658 | -171 | -173 | -175 | -176 | -177 | -178 | -178 | -179 | -180 | -180 | -179 | -179 | -178 | -177 | -175 | -171 | -163 | -157 | -157 | -160 | -153 |
| 201007 | LHZ | AR | 23 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 201006 | LHZ | AR | 171 | -174 | -176 | -178 | -178 | -179 | -179 | -180 | -180 | -181 | -181 | -181 | -181 | -180 | -179 | -176 | -173 | -165 | -159 | -159 | -161 | -155 |
| 201005 | LHZ | AR | 744 | -175 | -177 | -178 | -180 | -180 | -180 | -180 | -181 | -182 | -183 | -183 | -182 | -181 | -180 | -177 | -174 | -165 | -159 | -159 | -162 | -155 |
| 201004 | LHZ | AR | 695 | -178 | -179 | -181 | -182 | -181 | -182 | -182 | -183 | -183 | -184 | -184 | -183 | -182 | -181 | -178 | -175 | -166 | -159 | -157 | -158 | -152 |
| 201003 | LHZ | AR | 48 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 200904 | LHZ | AR | 307 | -181 | -181 | -181 | -182 | -181 | -182 | -182 | -183 | -184 | -185 | -185 | -184 | -183 | -181 | -178 | -175 | -165 | -159 | -159 | -160 | -154 |
| 200903 | LHZ | AR | 384 | -182 | -184 | -183 | -183 | -183 | -183 | -183 | -183 | -185 | -185 | -185 | -184 | -183 | -181 | -178 | -175 | -166 | -159 | -157 | -158 | -154 |
| 200902 | LHZ | AR | 481 | -181 | -181 | -183 | -183 | -183 | -182 | -183 | -184 | -184 | -184 | -184 | -183 | -182 | -181 | -177 | -174 | -165 | -159 | -157 | -157 | -151 |
| 200901 | LHZ | AR | 584 | -173 | -175 | -176 | -177 | -178 | -179 | -180 | -181 | -182 | -182 | -182 | -181 | -180 | -180 | -176 | -173 | -166 | -160 | -157 | -157 | -154 |
| 200812 | LHZ | AR | 696 | -157 | -159 | -160 | -163 | -165 | -168 | -170 | -171 | -172 | -174 | -175 | -176 | -177 | -177 | -176 | -173 | -165 | -158 | -157 | -157 | -154 |
| 200811 | LHZ | AR | 232 | -156 | -159 | -161 | -163 | -166 | -169 | -170 | -172 | -174 | -176 | -176 | -177 | -179 | -179 | -177 | -175 | -168 | -160 | -156 | -155 | -154 |
| 200809 | LHZ | AR | 524 | -181 | -182 | -181 | -182 | -182 | -182 | -183 | -183 | -184 | -185 | -185 | -184 | -182 | -181 | -178 | -174 | -167 | -160 | -159 | -160 | -156 |
| 200808 | LHZ | AR | 432 | -182 | -184 | -184 | -183 | -184 | -184 | -184 | -185 | -186 | -186 | -186 | -185 | -184 | -182 | -179 | -176 | -167 | -162 | -160 | -162 | -158 |