Airgun arrays for marine seismic surveys - Physics and directional characteristics
MetadataShow full item record
Airgun arrays are by far the most commonly used offshore seismic survey sound sources and, despite ongoing attempts to develop alternatives, are likely to remain so well into the future. Although designed to produce their highest sound levels in the vertically downward direction, these arrays also emit considerable acoustic energy in other directions, thus making them a potential hazard for marine animals. Each airgun array produces a complicated sound field, determined by the array layout (positions and sizes of its airguns), in which both the waveform and spectrum of the signal vary strongly with direction. This paper examines the relationship between the array layout and the directional characteristics of the sound field it produces with a view to providing guidance on how changes in array layout can be used to reduce the environmental impact of an array while retaining its utility as a seismic survey source.
Showing items related by title, author, creator and subject.
Fewtrell, Jane Leah (2003)The oil and gas industry is of major economic importance to Australia. Offshore seismic surveys are an essential component of exploration for fossil fuel reserves. Offshore seismic surveys involve the use of arrays of ...
A modelling comparison between received sound levels produced by a marine Vibroseis array and those from an airgun array for some typical seismic survey scenariosDuncan, Alec; Weilgart, L.; Leaper, R.; Jasny, M.; Livermore, S. (2016)Marine Vibroseis (MV) may provide a marine seismic sound source that has less environmental impact than conventional airguns. Modelled sound levels from a realistic MV array and airgun array with similar downward energy ...
Duncan, Alec (2016)The offshore seismic survey industry typically uses arrays of devices called airguns to generate the intense, lowfrequency sounds required for imaging the seabed geology. Concerns have arisen about the impacts that these ...