Table T3. Airgun source levels.
| Source | Specification |
|---|---|
| Energy source | One or two 250 in3 G airguns |
| Source output (downward) (1 × 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 × 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 1 µPa·mp |
| Air discharge volume (in3) | 250 or 500 |
| Dominant frequency components (Hz) | 0–256 |
Notes: * = 0-pk = 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. ‡ = pk-pk = peak to peak energy.
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