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The global importance and context of methane escape from the seabed

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Abstract

Seabed fluid flow includes volcanic and hydrothermal fluid emissions from ocean spreading centres, island arcs, and intra-plate volcanism, and groundwater flows in some coastal areas. Of direct concern to this paper is the escape of methane from the seabed. Escaping methane may be of microbial, thermogenic or abiogenic origin. Escapes occur in all seas and oceans, in coastal waters, on continental shelves, slopes and rises, the deep oceans, and deep ocean trenches. These represent a variety of geological contexts on passive continental margins, at convergent plate margins (accretionary wedges) and transform plate boundaries. Seepage is clearly widespread, and it contributes methane to the biosphere, the hydrosphere and the atmosphere, thus making up an important part of the global carbon cycle.

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Acknowledgements

The MAGIC GIS database used in the compilation of this paper was developed by Veronica Jukes as part of her MPhil research at the University of Sunderland. I thank Bob Garrison, Charlie Paull and Tom Lorenson for their helpful comments which significantly improved the original draft of this paper. Louise Tizzard assisted with the preparation of the diagrams.

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  1. Alan G. Judd

    Present address: School of Marine Science and Technology, University of Newcastle upon Tyne, Newcastle upon Tyne, NE1 7RU, UK

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  1. Applied Geology, University of Sunderland, Benedict Building, St. George’s Way, Sunderland, SR2 7BW, UK

    Alan G. Judd

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Judd, A.G. The global importance and context of methane escape from the seabed. Geo-Mar Lett 23, 147–154 (2003). https://doi.org/10.1007/s00367-003-0136-z

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