Table T2. Air gun source levels for zero-offset vertical seismic profile, Expedition 340T.
| Source | Specification |
|---|---|
| Energy source | One or two 250 in3 G air guns |
| 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 |
| Air discharge volume (in3) | 250 or 500 |
| Dominant frequency components (Hz) | 0–256 |
* = 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. 0-pk = peak energy. pk-pk = peak-to-peak energy.
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