Impulsive Noise Register


Reference layers
Pulse Block Days OSPAR
Pulse Block Days OSPAR


Pulse Block Days HELCOM
Pulse Block Days HELCOM


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
  • Noise Base Data
  • Indicator Layers
Filter criteria
Year
Noise Value Code
Source Event
Mitigation System
ICES Ecoregion
OSPAR Region
Helcom Subbasin
Year
Indicator
Pulse Block Days Per OSPAR Region
Pulse Block Days Per HELCOM Region
Pulse Block Days Per OSPAR Region (bar)
Pulse Block Days Per HELCOM Region (bar)
Maps of pulse block days by Value Code
None
NA
Very Low
Low
Medium
High
Very High