Noise Base Data Legend
 ICES sub-rectangle  UK Licence Blocks  German Naval Polygon  Point
Very Low
Sonar or acoustic deterrents (source level, rounded to nearest decibel)
176-200 dB re 1 μPa m
Generic explicitly impulsive source (energy source level, rounded to nearest decibel)
186-210 dB re 1 μPa2 m2 s
Airgun arrays (zero to peak source level, rounded to nearest decibel)
209-233 dB re 1 μPa m
Explosions (equivalent TNT charge mass, rounded to nearest 10 g if less than 10 kg and to nearest 1 kg otherwise)
8 g to 210 g
Impact pile driver (hammer energy, rounded to nearest 10 kJ)
< 280 kJ
Low
Sonar or acoustic deterrents (source level, rounded to nearest decibel)
201-210 dB re 1 μPa m
Generic explicitly impulsive source (energy source level, rounded to nearest decibel)
211-220 dB re 1 μPa2 m2 s
Airgun arrays (zero to peak source level, rounded to nearest decibel)
234-243 dB re 1 μPa m
Explosions (equivalent TNT charge mass, rounded to nearest 10 g if less than 10 kg and to nearest 1 kg otherwise)
220 g - 2.1 kg
Impact pile driver (hammer energy, rounded to nearest 10 kJ)
290 kJ - 2.80 MJ
Medium
Sonar or acoustic deterrents (source level, rounded to nearest decibel)
211-220 dB re 1 μPa m
Generic explicitly impulsive source (energy source level, rounded to nearest decibel)
221-230 dB re 1 μPa2 m2 s
Airgun arrays (zero to peak source level, rounded to nearest decibel)
244-253 dB re 1 μPa m
Explosions (equivalent TNT charge mass, rounded to nearest 10 g if less than 10 kg and to nearest 1 kg otherwise)
2.11 kg - 21 kg
Impact pile driver (hammer energy, rounded to nearest 10 kJ)
2.81 - 28 MJ
High
Sonar or acoustic deterrents (source level, rounded to nearest decibel)
> 220 dB re 1 μPa m
Generic explicitly impulsive source (energy source level, rounded to nearest decibel)
> 230 dB re 1 μPa2 m2 s
Airgun arrays (zero to peak source level, rounded to nearest decibel)
> 253 dB re 1 μPa m
Explosions (equivalent TNT charge mass, rounded to nearest 10 g if less than 10 kg and to nearest 1 kg otherwise)
22 kg - 210 kg
Impact pile driver (hammer energy, rounded to nearest 10 kJ)
> 28 MJ
Very High
Explosions (equivalent TNT charge mass, rounded to nearest 10 g if less than 10 kg and to nearest 1 kg otherwise)
> 210 kg
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Other Layers (year:)
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