Seamounts are active or extinct undersea volcanoes with heights exceeding ~ 100 m. They represent a small but significant fraction of the volcanic extrusive budget for oceanic seafloor and their distribution gives information about spatial and temporal variations in intraplate volcanic activity. In addition, they sustain important ecological communities, determine habitats for fish, and act as obstacles to currents, thus enhancing tidal energy dissipation and ocean mixing. Mapping the complete global distribution will help constrain models of seamount formation as well as aid in understanding marine habitats and deep ocean circulation. Two approaches have been used to map the global seamount distribution. Depth soundings from single- and multibeam echosounders can provide the most detailed maps with up to 200-m horizontal resolution. However, soundings from the > 5000 publicly available cruises sample only a small fraction of the ocean floor. Satellite altimetry can detect seamounts taller than ~ 1.5 km, and studies using altimetry have produced seamount catalogues holding almost 13,000 seamounts. Based on the size-frequency relationship for larger seamounts, we predict over 100,000 seamounts > 1 km in height remain uncharted, and speculatively 25 million > 100 m in height. Future altimetry missions could improve on resolution and significantly decrease noise levels, allowing for an even larger number of intermediate (1–1.5-km height) seamounts to be detected. Recent retracking of the radar altimeter waveforms to improve the accuracy of the gravity field has resulted in a twofold increase in resolution. Thus, improved analyses of existing altimetry with better calibration from multibeam bathymetry could also increase census estimates.

Wessel, P., D.T. Sandwell, and S.-S. Kim. 2010. The global seamount census. Oceanography 23(1):24–33, https://doi.org/10.5670/oceanog.2010.60.

Abers, G.A., B. Parsons, and J.K. Weissel. 1988. Seamount abundances and distributions in the southeast Pacific. Earth and Planetary Science Letters 87:137–151, https://doi.org/10.1016/0012-821X(88)90070-2.

Batiza, R. 1982. Abundances, distribution, and sizes of volcanoes in the Pacific Ocean and implications for the origin of non-hotspot volcanoes. Earth and Planetary Science Letters 60:195–206, https://doi.org/10.1016/0012-821X(82)90003-6.

Becker, J.J., and D.T. Sandwell. 2008. Global estimates of seafloor slope from single-beam ship soundings. Journal of Geophysical Research 113, C05028, https://doi.org/10.1029/2006JC003879.

Becker, J.J., D.T. Sandwell, W.H.F. Smith, J. Braud, B. Binder, J. Depner, D. Fabre, J. Factor, S. Ingalls, S.-H. Kim, and others. 2009. Global bathymetry and elevation data at 30 arc seconds resolution: SRTM30_PLUS. Marine Geodesy 32(4):355–371, https://doi.org/10.1080/01490410903297766.

Carron, M.J., P.R. Vogt, and W.-Y. Jung. 2001. A proposed international long-term project to systematically map the world’s ocean floors from beach to trench: GOMAP (Global Ocean Mapping Program). International Hydrographic Review 2(3):49–50.

Cochran, J.R. 2008. Seamount volcanism along the Gakkel Ridge, Arctic Ocean. Geophysical Journal International 174:1,153–1,173, https://doi.org/10.1111/j.1365-246X.2008.03860.x.

Craig, C.H., and D.T. Sandwell. 1988. Global distribution of seamounts from Seasat profiles. Journal of Geophysical Research 93(B9):10,408–10,420, https://doi.org/10.1029/JB093iB09p10408.

Fisher, A.T., and C.G. Wheat. 2010. Seamounts as conduits for massive fluid, heat, and solute fluxes on ridge flanks. Oceanography 23(1):74–87, https://doi.org/10.5670/oceanog.2010.63.

Goff, J.A. 1991. A global and regional stochastic analysis of near-ridge abyssal hill morphology. Journal of Geophysical Research 96(B13):21,713–21,737.

Goff, J.A., W.H.F. Smith, and K.M. Marks. 2004. The contributions of abyssal hill morphology and noise to altimetric gravity fabric. Oceanography 17(1):24–37, https://doi.org/10.5670/oceanog.2004.64.

Hillier, J.K., and A.B. Watts. 2004. “Plate-like” subsidence of the East Pacific Rise–South Pacific superswell system. Journal of Geophysical Research 109(B10):1–20, http://10.1029/2004JB003041

Hillier, J.K., and A.B. Watts. 2007. Global distribution of seamounts from ship-track bathymetry data. Geophysical Research Letters 34, L13304, https://doi.org/10.1029/2007GL029874.

International Hydrographic Organization. 2008. Standardization of undersea feature names. Available online at: http://www.gebco.net/data_and_products/undersea_feature_names/ (accessed November 17, 2009).

Jaroslow, G.E., D.K. Smith, and B.E. Tucholke. 2000. Record of seamount production and off-axis evolution in the western North Atlantic Ocean, 25°25’–27°10’N. Journal of Geophysical Research 105(B2):2,721–2,736, https://doi.org/10.1029/1999JB900253.

Jordan, T.H., H.W. Menard, and D.K. Smith. 1983. Density and size distribution of seamounts in the Eastern Pacific inferred from wide-beam sounding data. Journal of Geophysical Research 88(B12):10,508–10,518, https://doi.org/10.1029/JB088iB12p10508.

Kitchingman, A., and S. Lai. 2004. Inferences on potential seamount locations from mid-resolution bathymetric data. Pp. 7–12 in Seamounts: Biodiversity and Fisheries. T. Morato and D. Pauly, eds, Fisheries Centre, University of British Columbia, Canada, Vancouver, BC.

Kitchingman, A., S. Lai, T. Morato, and D. Pauly. 2007. How many seamounts are there and where are they located? Pp. 26–40 in Seamounts: Ecology, Fisheries and Conservation. T.J. Pitcher, T. Morato, P.J.B. Hart, M. Clark, N. Haggan, and R.C. Santos, eds, Fish and Aquatic Resources Series, Blackwell, Oxford, UK.

Lonsdale, P. 1977. Deep-tow observations at Mounds abyssal hydrothermal field, Galápagos Rift. Earth and Planetary Science Letters 36(1):92–110, https://doi.org/10.1016/0012-821X(77)90191-1.

Macdonald, K.C., and B.P. Luyendyk. 1985. Investigation of faulting and abyssal hill formation on the flanks of the East Pacific Rise (21°N) using Alvin. Marine Geophysical Researches 7(4):515–535, https://doi.org/10.1007/BF00368953.

Macdonald, K.C., P.J. Fox, R.T. Alexander, R.A. Pockalny, and P. Gente. 1996. Volcanic growth faults and the origin of Pacific abyssal hills. Nature 380(6570):125–129, https://doi.org/10.1038/380125a0.

Malinverno, A., and P.A. Cowie. 1993. Normal faulting and the topographic roughness of mid-ocean ridge flanks. Journal of Geophysical Research 98(B10):17,921–17,939, https://doi.org/10.1029/93JB01571.

Marks, K.M. 1996. Resolution of the Scripps/NOAA marine gravity field from satellite altimetry. Geophysical Research Letters 23(16):2,069–2,072, https://doi.org/10.1029/96GL02059.

Marks, K.M., and W.H.F. Smith. 2006. An evaluation of publicly available global bathymetry grids. Marine Geophysical Researches 27:19–34, https://doi.org/10.1007/s11001-005-2095-4.

Menard, H.W. 1964. Marine Geology of the Pacific. McGraw-Hill, New York, 271 pp.

National Geophysical Data Center. 2006. 2-minute gridded global relief data (ETOPO2v2). US Department of Commerce, National Oceanic and Atmospheric Administration.

Pitcher, T.J., T. Morato, P.J.B. Hart, M. Clark, N. Haggan, and R.C. Santos, eds. 2007. Seamounts: Ecology, Fisheries and Conservation. Fish and Aquatic Resources Series, 12, Blackwell, Oxford, UK, 527 pp.

Sandwell, D.T., and W.H.F. Smith. 1997. Marine gravity from Geosat and ERS-1 altimetry. Journal of Geophysical Research 102:10,039–10,054, https://doi.org/10.1029/96JB03223.

Sandwell, D.T., and W.H.F. Smith. 2009. Global marine gravity from retracked Geosat and ERS-1 altimetry: Ridge segmentation versus spreading rate. Journal of Geophysical Research 114, B01411, https://doi.org/10.1029/2008JB006008.

Sandwell, D.T., and P. Wessel. 2010. Box 3: Seamount discovery tool aids navigation to uncharted seafloor features. Oceanography 23(1):34–36, https://doi.org/10.5670/oceanog.2010.87.

Sandwell, D., S.T. Gille, and W.H.F. Smith. 2002. Bathymetry from Space: Oceanography, Geophysics, and Climate. Geoscience Professional Services, Bethesda, MD, 24 pp. Available online at: http://www.geo-prose.com/pdfs/bathy_from_space.pdf (accessed November 17, 2009).

Sandwell, D.T., W.H.F. Smith, S. Gille, E. Kappel, S. Jayne, K. Soofi, B. Coakley, and L. Louis. 2006. Bathymetry from space: Rationale and requirements for a new, high-resolution altimetric mission. Comptes Rendus Geoscience 338:1,049–1,062, https://doi.org/10.1016/j.crte.2006.05.014.

Smith, D.K., and J.R. Cann. 1990. Hundreds of small volcanoes on the median valley floor of the Mid-Atlantic Ridge at 24–30°N. Nature 348:152–155, https://doi.org/10.1038/348152a0.

Smith, D.K., and J.R. Cann. 1992. The role of seamount volcanism in crustal construction at the mid-Atlantic ridge. Journal of Geophysical Research 97(B2):1,645–1,658, https://doi.org/10.1029/91JB02507.

Smith, D.K., and T.H. Jordan. 1988. Seamount statistics in the Pacific Ocean. Journal of Geophysical Research 93(B4):2,899–2,918, https://doi.org/10.1029/JB093iB04p02899.

Smith, W.H.F. 1998. Seafloor tectonic fabric from satellite altimetry. Annual Review of Earth and Planetary Sciences 26:697–738, https://doi.org/10.1146/annurev.earth.26.1.697.

Smith, W.H.F., and D.T. Sandwell. 1997. Global sea floor topography from satellite altimetry and ship depth soundings. Science 277(5334):1,956–1,962,
https://doi.org/10.1126/science.277.5334.1956.

Smith, W.H.F., and D.T. Sandwell. 2004. Conventional bathymetry, bathymetry from space, and geodetic altimetry. Oceanography 17(1):8–23, https://doi.org/10.5670/oceanog.2004.63.

Staudigel, H., and D.A. Clague. 2010. The geological history of deep-sea volcanoes: Biosphere, hydrosphere, and lithosphere interactions. Oceanography 23(1):58–71, https://doi.org/10.5670/oceanog.2010.62.

Wessel, P. 2001. Global distribution of seamounts inferred from gridded Geosat/ERS-1 altimetry. Journal of Geophysical Research 106(B9):19,431–19,441, https://doi.org/10.1029/2000JB000083.

Wessel, P., and S. Lyons. 1997. Distribution of large Pacific seamounts from Geosat/ERS-1: Implications for the history of intraplate volcanism. Journal of Geophysical Research 102(B10):22,459–22,476, https://doi.org/10.1029/97JB01588.

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