This article summarizes salient points one must know about seismic air-gun arrays to discuss seriously how they might affect marine life. It is by no means exhaustive but tries to be thorough enough without being too involved to deter the general reader.

Figure 1 shows a portion of an air-gun array. Note the man kneeling for scale. The orange tubes that look like large hot dogs are the floats that support the air guns; the air guns themselves are hanging beneath the floats. Typical volumes of air expelled by air guns vary from 30 in3 to about 800 in...

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