Table T3. Airgun source levels. (See table notes.)
Source
|
Specification |
|---|---|
| Energy source | One or two 250 in3 G airguns |
| Source output (downward) (1 x 250 in3) | 0–pk* is 3.1 bar-m (229.8 dB re 1 μPa·mp)‡ pk–pk† is 6.4 bar-m (236.2 dB re 1 μPa·mp–p) |
| Source output (downward) (2 x 250 in3) | 0–pk is 5.2 bar-m (234.3 dB re 1 μPa·mp) pk–pk is 10.8 bar-m (240.7 dB re 1 μPa·mp–p) |
| Deployment depth of energy source (m) | 2–7 |
| Air discharge volume (in3) | 250 or 500 |
| Dominant frequency components (Hz) | 0–256 |
Notes: * = 0–pk = peak energy, † = pk–pk = peak to peak energy, ‡ = the source level is a measure of the effective sound pressure at a given distance from the source array, relative to a reference value. It is commonly expressed in decibels at 1 m from the source relative to μPascal–m, or dB re 1 μPa·m.
Previous | Close | Top of page