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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KBS-IU | LHZ-00 | AR | 2584 | -184 | -184 | -184 | -183 | -183 | -183 | -184 | -185 | -185 | -186 | -185 | -185 | -183 | -181 | -177 | -173 | -165 | -158 | -155 | -157 | -160 | -151 | -139 | -133 | -129 | -126 |
| KBS-IU | LHZ-10 | AR | 2542 | -179 | -180 | -181 | -181 | -182 | -182 | -182 | -183 | -184 | -184 | -184 | -184 | -182 | -180 | -177 | -173 | -165 | -158 | -155 | -157 | -160 | -150 | -139 | -133 | -129 | -126 |
| ALE-II | LHZ-00 | AR | 2688 | -185 | -184 | -184 | -184 | -183 | -183 | -184 | -184 | -185 | -185 | -185 | -184 | -183 | -180 | -177 | -172 | -164 | -157 | -154 | -154 | -154 | -144 | -131 | -124 | -124 | -126 |
| ALE-II | LHZ-10 | AR | 2688 | -176 | -178 | -180 | -181 | -182 | -183 | -183 | -185 | -186 | -186 | -185 | -185 | -183 | -180 | -177 | -172 | -163 | -157 | -154 | -154 | -154 | -144 | -131 | -124 | -124 | -126 |
| SPA0-NO | BHZ-00 | AR | 2639 | -160 | -164 | -166 | -170 | -172 | -175 | -176 | -178 | -179 | -180 | -180 | -180 | -180 | -178 | -176 | -172 | -164 | -159 | -156 | -157 | -160 | -150 | -140 | -132 | -128 | -125 |
| SFJD-IU | LHZ-00 | AR | 2592 | -182 | -183 | -183 | -183 | -183 | -183 | -184 | -185 | -186 | -185 | -185 | -183 | -181 | -179 | -176 | -172 | -164 | -157 | -153 | -151 | -152 | -142 | -125 | -117 | -117 | -119 |
| DAG-GE | LHZ | AR | 2653 | -167 | -170 | -172 | -174 | -175 | -177 | -178 | -179 | -180 | -181 | -181 | -180 | -179 | -177 | -174 | -170 | -163 | -157 | -153 | -153 | -154 | -143 | -132 | -126 | -126 | -129 |
| FRB-CN | BHZ | AR | 2638 | -175 | -177 | -178 | -179 | -179 | -179 | -179 | -180 | -181 | -181 | -182 | -182 | -181 | -179 | -176 | -171 | -162 | -156 | -153 | -153 | -150 | -140 | -131 | -126 | -124 | -126 |
| SFJD-IU | LHZ-10 | AR | 2592 | -163 | -166 | -168 | -170 | -172 | -174 | -175 | -177 | -179 | -180 | -181 | -180 | -179 | -178 | -175 | -171 | -164 | -157 | -153 | -151 | -152 | -142 | -126 | -117 | -117 | -119 |
| RES-CN | BHZ | AR | 2638 | -164 | -165 | -166 | -167 | -169 | -169 | -170 | -172 | -173 | -174 | -175 | -175 | -176 | -176 | -175 | -171 | -163 | -157 | -155 | -155 | -150 | -139 | -131 | -126 | -127 | -129 |
| BORG-II | LHZ-00 | AR | 2688 | -172 | -172 | -173 | -173 | -174 | -174 | -175 | -175 | -175 | -176 | -176 | -176 | -177 | -176 | -175 | -172 | -165 | -158 | -152 | -149 | -149 | -138 | -119 | -107 | -106 | -106 |
| JMIC-NO | BHZ-00 | AR | 2688 | -160 | -161 | -162 | -164 | -165 | -167 | -168 | -169 | -169 | -170 | -170 | -171 | -171 | -172 | -173 | -172 | -167 | -160 | -154 | -152 | -150 | -141 | -125 | -118 | -114 | -114 |
| BORG-II | LHZ-10 | AR | 2688 | -156 | -158 | -161 | -163 | -165 | -167 | -169 | -171 | -173 | -170 | -166 | -175 | -176 | -175 | -171 | -171 | -165 | -158 | -152 | -149 | -148 | -138 | -119 | -107 | -106 | -106 |
| SUMG-GE | LHZ | AR | 2688 | -145 | -147 | -149 | -151 | -153 | -155 | -157 | -160 | -163 | -166 | -169 | -172 | -174 | -175 | -174 | -170 | -163 | -156 | -152 | -151 | -152 | -141 | -125 | -117 | -116 | -118 |