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.
| Stat. | Chan. | Qual. | # obs. | 268s | 228s | 193s | 164s | 139s | 118s | 100s | 85s | 72s | 61s | 52s | 44s | 37s | 32s | 27s | 23s | 19s | 16s | 14s | 12s | 10s | 8s | 7s | 6s | 5s | 4s |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HSPB-PL | HHZ | AR | 2976 | -184 | -184 | -184 | -183 | -183 | -183 | -184 | -185 | -186 | -186 | -186 | -185 | -184 | -183 | -179 | -175 | -168 | -163 | -163 | -164 | -162 | -152 | -146 | -143 | -139 | -136 |
| KBS-IU | LHZ-00 | AR | 2976 | -184 | -184 | -183 | -183 | -183 | -181 | -178 | -185 | -186 | -186 | -186 | -186 | -185 | -183 | -180 | -176 | -168 | -163 | -162 | -163 | -162 | -152 | -145 | -143 | -139 | -136 |
| KBS-IU | LHZ-10 | AR | 2976 | -180 | -181 | -182 | -182 | -182 | -183 | -183 | -184 | -185 | -186 | -186 | -186 | -184 | -183 | -180 | -176 | -168 | -162 | -162 | -163 | -162 | -152 | -145 | -143 | -139 | -136 |
| ALE-II | LHZ-00 | AR | 2976 | -185 | -185 | -184 | -184 | -184 | -184 | -184 | -185 | -186 | -186 | -186 | -186 | -185 | -183 | -179 | -175 | -167 | -161 | -162 | -164 | -160 | -151 | -145 | -142 | -140 | -138 |
| JMIC-NO | BHZ-00 | AR | 2894 | -178 | -179 | -180 | -181 | -181 | -182 | -183 | -183 | -184 | -184 | -185 | -184 | -183 | -183 | -180 | -177 | -170 | -164 | -163 | -163 | -160 | -150 | -143 | -141 | -135 | -130 |
| ALE-II | LHZ-10 | AR | 2976 | -172 | -174 | -176 | -177 | -179 | -180 | -181 | -182 | -183 | -184 | -184 | -184 | -183 | -181 | -178 | -174 | -166 | -161 | -162 | -164 | -160 | -151 | -145 | -142 | -140 | -138 |
| SPB4-NO | BHZ-00 | AR | 2743 | -160 | -163 | -167 | -170 | -173 | -176 | -178 | -179 | -181 | -181 | -182 | -182 | -182 | -181 | -179 | -175 | -168 | -163 | -163 | -164 | -162 | -151 | -145 | -142 | -138 | -134 |
| SPB1-NO | BHZ-00 | AR | 2743 | -161 | -164 | -167 | -170 | -173 | -175 | -177 | -179 | -180 | -180 | -181 | -181 | -181 | -180 | -178 | -175 | -168 | -163 | -163 | -164 | -162 | -151 | -145 | -143 | -139 | -134 |
| SPB3-NO | BHZ-00 | AR | 2743 | -160 | -164 | -167 | -170 | -173 | -175 | -177 | -179 | -180 | -181 | -182 | -182 | -182 | -181 | -179 | -175 | -168 | -163 | -163 | -164 | -162 | -151 | -145 | -142 | -138 | -134 |
| NOR-DK | LHZ | AR | 2423 | -168 | -171 | -172 | -174 | -176 | -177 | -178 | -180 | -181 | -182 | -182 | -182 | -181 | -180 | -178 | -174 | -166 | -162 | -163 | -164 | -161 | -151 | -145 | -142 | -138 | -135 |
| SPA0-NO | BHZ-00 | AR | 2743 | -159 | -162 | -165 | -169 | -171 | -174 | -176 | -178 | -179 | -180 | -180 | -181 | -181 | -180 | -178 | -175 | -168 | -163 | -163 | -164 | -162 | -151 | -145 | -143 | -139 | -134 |
| SFJD-IU | LHZ-00 | AR | 2976 | -174 | -176 | -178 | -179 | -180 | -181 | -182 | -183 | -184 | -185 | -185 | -184 | -182 | -181 | -178 | -174 | -166 | -161 | -161 | -161 | -159 | -150 | -144 | -142 | -138 | -134 |
| SUMG-GE | LHZ | AR | 2280 | -182 | -182 | -183 | -183 | -183 | -183 | -183 | -184 | -185 | -185 | -184 | -183 | -181 | -180 | -177 | -173 | -166 | -162 | -162 | -163 | -160 | -149 | -142 | -139 | -135 | -130 |
| SPB5-NO | BHZ-00 | AR | 2744 | -158 | -162 | -164 | -167 | -170 | -172 | -174 | -175 | -177 | -177 | -178 | -178 | -178 | -178 | -177 | -174 | -168 | -163 | -163 | -164 | -162 | -151 | -145 | -143 | -139 | -134 |
| KULLO-DK | LHZ | AR | 2950 | -176 | -178 | -177 | -178 | -180 | -180 | -179 | -178 | -178 | -179 | -179 | -180 | -179 | -177 | -175 | -172 | -166 | -162 | -162 | -163 | -161 | -150 | -143 | -142 | -139 | -136 |
| DAG-GE | LHZ | AR | 2932 | -159 | -161 | -163 | -165 | -166 | -168 | -170 | -172 | -174 | -175 | -177 | -178 | -179 | -179 | -177 | -173 | -166 | -162 | -162 | -163 | -161 | -151 | -145 | -143 | -140 | -136 |
| NUUG-DK | LHZ | AR | 998 | -173 | -174 | -174 | -174 | -175 | -173 | -178 | -177 | -177 | -178 | -178 | -178 | -177 | -176 | -175 | -172 | -166 | -162 | -162 | -163 | -160 | -150 | -145 | -143 | -139 | -135 |
| ILULI-DK | LHZ | AR | 2974 | -175 | -177 | -178 | -179 | -180 | -181 | -181 | -182 | -182 | -182 | -181 | -181 | -180 | -178 | -176 | -172 | -165 | -160 | -161 | -161 | -158 | -149 | -143 | -141 | -139 | -134 |
| NUUK-DK | LHZ | AR | 380 | -180 | -180 | -181 | -182 | -182 | -182 | -182 | -183 | -184 | -185 | -184 | -183 | -182 | -180 | -176 | -172 | -164 | -159 | -158 | -154 | -151 | -147 | -143 | -137 | -128 | -121 |
| NRS-DK | LHZ | AR | 967 | -174 | -177 | -178 | -178 | -179 | -180 | -181 | -181 | -182 | -184 | -184 | -183 | -181 | -179 | -176 | -172 | -165 | -159 | -158 | -158 | -156 | -149 | -142 | -138 | -134 | -131 |
| BORG-II | LHZ-10 | AR | 2976 | -159 | -161 | -165 | -167 | -170 | -172 | -175 | -177 | -179 | -180 | -180 | -181 | -180 | -180 | -178 | -175 | -168 | -163 | -163 | -162 | -156 | -150 | -142 | -138 | -132 | -127 |
| SPB2-NO | BHZ-00 | AR | 2743 | -156 | -160 | -163 | -166 | -169 | -172 | -173 | -175 | -176 | -177 | -178 | -179 | -179 | -178 | -177 | -174 | -167 | -162 | -162 | -164 | -161 | -150 | -144 | -142 | -138 | -133 |
| FRB-CN | BHZ | AR | 2976 | -176 | -176 | -176 | -176 | -177 | -177 | -178 | -178 | -179 | -179 | -180 | -180 | -179 | -178 | -177 | -173 | -165 | -159 | -160 | -161 | -157 | -147 | -143 | -142 | -138 | -134 |
| RES-CN | BHZ | AR | 2976 | -164 | -166 | -168 | -169 | -170 | -172 | -173 | -174 | -175 | -176 | -177 | -177 | -177 | -177 | -177 | -173 | -166 | -161 | -162 | -163 | -158 | -147 | -143 | -142 | -139 | -135 |
| BORG-II | LHZ-00 | AR | 2976 | -170 | -171 | -171 | -171 | -172 | -172 | -172 | -172 | -173 | -174 | -174 | -174 | -175 | -175 | -175 | -173 | -168 | -163 | -163 | -163 | -160 | -150 | -142 | -138 | -132 | -127 |
| SFJD-IU | LHZ-10 | AR | 2976 | -156 | -158 | -160 | -162 | -163 | -165 | -167 | -169 | -171 | -172 | -173 | -175 | -176 | -176 | -175 | -172 | -165 | -161 | -161 | -161 | -159 | -150 | -144 | -142 | -139 | -134 |
| TULEG-DK | LHZ | AR | 2976 | -162 | -163 | -165 | -164 | -164 | -166 | -167 | -168 | -170 | -171 | -172 | -174 | -174 | -174 | -174 | -171 | -165 | -161 | -162 | -162 | -159 | -149 | -144 | -142 | -139 | -136 |
| EUNU-CN | BHZ | AR | 2894 | -137 | -138 | -140 | -142 | -143 | -144 | -146 | -148 | -149 | -151 | -153 | -154 | -156 | -158 | -159 | -161 | -159 | -157 | -158 | -160 | -156 | -147 | -141 | -141 | -138 | -134 |