Report on Task 4 of project "SVOW OGP JIP airgun measurements: reporting
report
Measurements of sound emitted from airguns and airgun clusters are described. Measurements were made in 2007 and 2009-2010 in fjord environments in Norway and for various airgun types, chamber pressures, operating depths and airgun volumes. For each combination of these parameters, a sequence of up to 50 shots was performed, resulting in a few tens of thousands of shots recorded on approximately 20 hydrophone channels at a variety of positions. The measurements were made to establish a definitive dataset to characterize the acoustical properties of single airguns and airgun clusters. The data were intended for calibration and validation of airgun modelling tools, including those capable of producing estimates at angles and frequencies outside the ranges typically used for seismic imaging. Summaries are given of the procedure whereby the dataset was pre-processed and subsequently used to characterise the acoustic output of all subject airguns. A summary is also made of the validation of the characterisations by comparison of sound pressures predicted using those characterisations and measured on far-field hydrophones during data acquisition. References are made to interim reports in which more details of these activities are available. The format of a dataset containing the results of the processing is described.
TNO Identifier
882065
Publisher
TNO
Collation
35 p. (incl. bijl.)
Place of publication
Den Haag