Volcanic eruptions are important events in Earth’s cycle of magma generation and crustal construction. Over durations of hours to years, eruptions produce new deposits of lava and/or fragmentary ejecta, transfer heat and magmatic volatiles from Earth’s interior to the overlying air or seawater, and significantly modify the landscape and perturb local ecosystems. Today and through most of geological history, the greatest number and volume of volcanic eruptions on Earth have occurred in the deep ocean along mid-ocean ridges, near subduction zones, on oceanic plateaus, and on thousands of mid-plate seamounts. However, deep-sea eruptions (> 500 m depth) are much more difficult to detect and observe than subaerial eruptions, so comparatively little is known about them. Great strides have been made in eruption detection, response speed, and observational detail since the first recognition of a deep submarine eruption at a mid-ocean ridge 25 years ago. Studies of ongoing or recent deep submarine eruptions reveal information about their sizes, durations, frequencies, styles, and environmental impacts. Ultimately, magma formation and accumulation in the upper mantle and crust, plus local tectonic stress fields, dictate when, where, and how often submarine eruptions occur, whereas eruption depth, magma composition, conditions of volatile segregation, and tectonic setting determine submarine eruption style.

Rubin, K.H., S.A. Soule, W.W. Chadwick Jr., D.J. Fornari, D.A. Clague, R.W. Embley, E.T. Baker, M.R. Perfit, D.W. Caress, and R.P. Dziak. 2012. Volcanic eruptions in the deep sea. Oceanography 25(1):142–157, https://doi.org/10.5670/oceanog.2012.12.

Auzende, J.M., V. Ballu, R. Batiza, D. Bideau, J.L. Charlou, M.H. Cormier, Y. Fouquet, P. Geistdoerfer, Y. Lagabrielle, J. Sinton, and P. Spadea. 1996. Recent tectonic, magmatic, and hydrothermal activity on the East Pacific Rise between 17°S and 19°S: Submersible observations. Journal of Geophysical Research 101:17,995–18,010, https://doi.org/10.1029/96JB01209.

Baker, E.T., W.W. Chadwick Jr., J.P. Cowen, R.P. Dziak, K.H. Rubin, and D.J. Fornari. 2012. Hydrothermal discharge during submarine eruptions: The importance of detection, response, and new technology. Oceanography 25(1):128–141, https://doi.org/10.5670/oceanog.2012.11.

Baker, E.T., J.E. Lupton, J.A. Resing, T. Baumberger, M.D. Lilley, S.L. Walker, and K.H. Rubin. 2011. Unique event plumes from a 2008 eruption on the Northeast Lau Spreading Center. Geochemistry Geophysics Geosystems 12, Q0AF02, https://doi.org/10.1029/2011GC003725.

Baker, E.T., G.J. Massoth, and R.A. Feely. 1987. Cataclysmic hydrothermal venting on the Juan de Fuca Ridge. Nature 329:149–151, https://doi.org/10.1038/329149a0.

Ballard, R.D., R.T. Holcomb, and T.H. van Andel. 1979. The Galapagos Rift at 86°W: Sheet flows, collapse pits, and lava lakes of the rift valley. Journal of Geophysical Research 84:5,407–5,422, https://doi.org/10.1029/JB084iB10p05407.

Ballard, R.D., and T.H. van Andel. 1977. Morphology and tectonics of the inner rift valley at lat 36°50’N on the Mid‐Atlantic Ridge. Geological Society of America Bulletin 88:507–530, https://doi.org/10.1130/0016-7606(1977)88<507:MATOTI>2.0.CO;2.

Ballard, R.D., T.H. van Andel, and R.T. Holcomb. 1982. The Galapagos Rift at 86°W 5. Variations in volcanism, structure, and hydrothermal activity along a 30-kilometer segment of the rift valley. Journal of Geophysical Research 87:1,149–1,161, https://doi.org/10.1029/JB087iB02p01149.

Barreyre T., S.A. Soule, and R.A. Sohn. 2011. Dispersal of volcaniclasts during deep-sea eruptions: Settling velocities and entrainment in buoyant seawater plumes. Journal of Volcanology and Geothermal Research 205:84–93, https://doi.org/10.1016/j.jvolgeores.2011.05.006.

Bergmanis, E.C., J. Sinton, and K.H. Rubin 2007. Recent eruptive history and magma reservoir dynamics on the southern East Pacific Rise at 17.5°S. Geochemistry Geophysics Geosystems 8, Q12O06, https://doi.org/10.1029/2007GC001742.

Bonatti, E., and C.G.A. Harrison. 1988. Eruption styles of basalt in oceanic spreading ridges and seamounts: Effect of magma temperature and viscosity. Journal of Geophysical Research 93:2,967–2,980, https://doi.org/10.1029/JB093iB04p02967.

Bowles, J., J.S. Gee, D.V. Kent, E. Bergmanis, and J. Sinton. 2005. Cooling rate effects on paleointensity estimates in submarine basaltic glass and implications for dating young flows. Geochemistry Geophysics Geosystems 6, Q07002, https://doi.org/10.1029/2004GC000900.

Bowles, J., J.S. Gee, D.V. Kent, M.R. Perfit, S.A. Soule, and D.J. Fornari. 2006. Paleointensity applications to timing and extent of eruptive activity, 9–10°N East Pacific Rise. Geochemistry Geophysics Geosystems 7, Q06006, https://doi.org/10.1029/2005GC001141.

Bryan, W.B., and J.G. Moore. 1977. Compositional variations of young basalts in the Mid-Atlantic Ridge rift valley near 36°49’N. Geological Society of America Bulletin 88: 556–570, https://doi.org/10.1130/0016-7606(1977)88<556:CVOYBI>2.0.CO;2.

Butterfield, D.A., I.R. Jonasson, G.J. Massoth, R.A. Feely, K.K. Roe, R.E. Embley, J.F. Holden, R.E. McDuff, M.D. Lilley, and J.R. Delaney. 1997. Seafloor eruptions and evolution of hydrothermal fluid chemistry. Philosophical Transactions of the Royal Society of London A 355:369–386, http://www.jstor.org/stable/54792.

Canales, J.P., S. Singh, R.S. Detrick, S. Carbotte, A. Harding, G.M. Kent, J.B. Diebold, J.M. Babcock, and M.R. Nedimović. 2006. Seismic evidence for variations in axial magma chamber properties along the southern Juan de Fuca Ridge. Earth and Planetary Science Letters 246:353–366, https://doi.org/10.1016/j.epsl.2006.04.032.

Carbotte, S.M., J.P. Canales, M.R. Nedimović, H. Carton, and J.C. Mutter. 2012. Recent seismic studies at the East Pacific Rise 8°20’–10°10’N and Endeavour Segment: Insights into mid-ocean ridge hydrothermal and magmatic processes. Oceanography 25(1):100–112, https://doi.org/10.5670/oceanog.2012.08.

Carbotte, S., and K. Macdonald. 1992. East Pacific Rise 8°–10°30’N: Evolution of ridge segments and discontinuities from SeaMARC II and three-dimensional magnetic studies. Journal of Geophysical Research 97:6,959–6,982, https://doi.org/10.1029/91JB03065.

Caress, D.W., D.A. Clague, H. Thomas, D. Thompson, J.B. Paduan, J. Martin, and W.W. Chadwick Jr. 2011. Extent of the 2011 Axial Seamount eruption from repeated 1-m scale bathymetry surveys with the MBARI Mapping AUV. Eos, Transactions, American Geophysical Union 92(52):Fall Meeting Supplement Abstract V11E-2557.

Chadwick, W.W. Jr. 2003. Quantitative constraints on the growth of submarine lava pillars from a monitoring instrument that was caught in a lava flow. Journal of Geophysical Research 108(B11), 2534, https://doi.org/10.1029/2003JB002422.

Chadwick, W.W. Jr., K.V. Cashman, R.W. Embley, H. Matsumoto, R.P. Dziak, C.E.J. de Ronde, T.-K. Lau, N. Deardorff, and S.G. Merle. 2008. Direct video and hydrophone observations of submarine explosive eruptions at NW Rota-1 Volcano, Mariana Arc. Journal of Geophysical Research 113, B08S10, https://doi.org/10.1029/2007JB005215.

Chadwick, W.W. Jr., R.P. Dziak, J.H. Haxel, R.W. Embley, and H. Matsumoto. 2012. Submarine landslide triggered by volcanic eruption recorded by in-situ hydrophone. Geology 40:51–54, https://doi.org/10.1130/G32495.1.

Chadwick, W.W. Jr., and R.W. Embley. 1994. Lava flows from a mid-1980s submarine eruption on the Cleft Segment, Juan de Fuca Ridge. Journal of Geophysical Research 99(B3):4,761–4,776, https://doi.org/10.1029/93JB02041.

Chadwick, W.W. Jr., R.W. Embley, and C.G. Fox. 1991. Evidence for volcanic eruption on the southern Juan de Fuca Ridge between 1981 and 1987. Nature 350:416–418, https://doi.org/10.1038/350416a0.

Chadwick, W.W. Jr., R.W. Embley, and P.D. Johnson. 1996. Comparative study of recent eruptive sites on the Gorda and Juan de Fuca Ridges using AMS-60 sidescan sonar. Eos, Transactions, American Geophysical Union 77(46):Fall Meeting Supplement F1.

Chadwick, W.W. Jr., R.W. Embley, and T.M. Shank. 1998. The 1996 Gorda Ridge eruption: Geologic mapping, sidescan sonar, and SeaBeam comparison results. Deep-Sea Research Part II 45(12):2,547–2,570, https://doi.org/10.1016/S0967-0645(98)00083-6.

Chadwick, W.W. Jr., T.K.P. Gregg, and R.W. Embley. 1999. Submarine lineated sheet flows: A unique lava morphology formed on subsiding lava ponds. Bulletin of Volcanology 61:194–206, https://doi.org/10.1007/s004450050271.

Chadwick, W.W. Jr., S.L. Nooner, D.A. Butterfield, M.D. Lilley, D.A. Clague, D.W. Caress, R.P. Dziak, and J.H. Haxel. 2011. Discovery of the 2011 eruption at Axial Seamount. Eos, Transactions, American Geophysical Union 92(52):Fall Meeting Supplement Abstract V41-X.

Clague, D.A., D.W. Caress, K.H. Rubin, and J.B. Paduan. 2010a. The 2008 Puipui eruption and morphology of the Northeast Lau Spreading Center between Maka and Tafu. Eos, Transactions, American Geophysical Union 92(52):Fall Meeting Supplement Abstract T11E-03.

Clague, D.A., A.S. Davis, J.L. Bischoff, J.E. Dixon, and R. Geyer. 2000. Lava bubble-wall fragments formed by submarine hydrovolcanic explosions on Loihi Seamount and Kilauea Volcano. Bulletin of Volcanology 61:437–449, https://doi.org/10.1007/PL00008910.

Clague, D.A., J.B. Paduan, D. Caress, H. Thomas, and W.W. Chadwick Jr. 2011. Volcanic morphology of West Mata Volcano, NE Lau Basin, based on high-resolution bathymetry and depth changes. Geochemistry Geophysics Geosystems 12, QOAF03, https://doi.org/10.1029/2011GC003791.

Clague, D.A., J.B. Paduan, and A.S. Davis. 2009. Widespread strombolian eruptions of mid-ocean ridge basalt. Journal of Volcanology and Geothermal Research 180:171–188, https://doi.org/10.1016/j.jvolgeores.2008.08.007.

Clague, D.A., J.B. Paduan, B.M. Dreyer, and D.W. Caress. 2010b. Lava flow ages and geologic mapping on mid-ocean ridges. Eos, Transactions, American Geophysical Union 91(52):Fall Meeting Supplement Abstract V11A-2236.

Corliss, J.B., J. Dymond, L.I. Gordon, J.M. Edmund, R.P. von Herzen, R.D. Ballard, K. Green, D. Williams, A. Brainbridge, K. Crane, and T.J. Van Andel. 1979. Submarine thermal springs on the Galápagos Rift. Science 203:1,073–1,083, https://doi.org/10.1126/science.203.4385.1073.

Cowen, J.P., D.J. Fornari, T.M. Shank, B. Love, B. Glazer, A.H. Treusch, R.C. Holmes, S.A. Soule, E.T. Baker, M. Tolstoy, and K.R. Pomraning. 2007. Volcanic eruptions at East Pacific Rise crest near 9°50’N. Eos, Transactions, American Geophysical Union 88(7):81, https://doi.org/10.1029/2007EO070001.

Davis, A.S., and D.A. Clague. 2006. Deep submarine explosive basaltic eruptions at vents in the North Arch Volcanic Field. Bulletin of Volcanology 68:294–307, https://doi.org/10.1007/s00445-005-0008-7.

Deardorff, N.D., K.V. Cashman, and W.W. Chadwick Jr. 2011. Observations of eruptive plumes and pyroclastic deposits from submarine explosive eruptions at NW Rota-1, Mariana Arc. Journal of Volcanology and Geothermal Research 20:47–59, https://doi.org/10.1016/j.jvolgeores.2011.01.003.

Delaney, J.R., D.S. Kelley, M.D. Lilley, D.A. Butterfield, J.A. Baross, W.S.D. Wilcock, R.W. Embley, and M. Summit. 1998. The quantum event of oceanic crustal accretion: Impacts of diking at mid-ocean ridges. Science 281:222–230, https://doi.org/10.1126/science.281.5374.222.

Dziak, R.P., D.R. Bohnenstiehl, E.T. Baker, H. Matsumoto, J.H. Haxel, S.L. Walker, and M.J. Fowler. 2010. Volcanic explosions, seismicity, and debris from the West and North Mata Volcano Complex, NE Lau Basin. Eos, Transactions, American Geophysical Union 91(52):Fall Meeting Supplement Abstract T13B-2186.

Dziak, R.P., D.R. Bohnenstiehl, J.P. Cowen, E.T. Baker, K.H. Rubin, J.H. Haxel, and M.J. Fowler. 2007. Rapid dike emplacement leads to eruptions and hydrothermal plume release during seafloor spreading events. Geology 35:579–582, https://doi.org/10.1130/G23476A.1.

Dziak, R.P., J. Cowen, E.T. Baker, D. Bohnenstiehl, W.W. Chadwick Jr., J.A. Resing, and R.W. Embley. 2006. Detecting volcanic events in the Northeast Pacific. Eos, Transactions, American Geophysical Union 87(4):37, https://doi.org/10.1029/2006EO040001.

Dziak, R.P., R.W. Embley, E.T. Baker, W.W. Chadwick Jr., J.A. Resing, H. Matsumoto, J.H. Haxel, S.L. Walker, and D.R. Bohnenstiehl. 2009. Long-term explosion records from two erupting submarine volcanoes in the Mariana and Tonga island-arcs. Eos, Transactions, American Geophysical Union 90(52):Fall Meeting Supplement Abstract V44B-02.

Dziak, R.P., and C.G. Fox. 1999. The January 1998 earthquake swarm at Axial Volcano, Juan de Fuca Ridge: Hydroacoustic evidence of seafloor volcanic activity. Geophysical Research Letters 26:3,429–3,432, https://doi.org/10.1029/1999GL002332.

Dziak, R.P., S.R. Hammond, and C.G. Fox. 2011. A 20-year hydroacoustic time series of seismic and volcanic events in the Northeast Pacific Ocean. Oceanography 24:280–293, https://doi.org/10.5670/oceanog.2011.79.

Eissen, J.P., Y. Fouquet, D. Hardy, and H. Ondreas. 2003. Recent MORB volcaniclastic explosive deposits formed between 500 and 1750 m.b.s.l. on the axis of the Mid-Atlantic Ridge, south of the Azores. Pp. 143–166 in Explosive Subaqueous Volcanism. J.D.L. White, J.L. Smellie, and D.A. Clague, eds, Geophysical Monograph Series, vol. 140, American Geophysical Union, Washington, DC.

Embley, R.W., and W.W. Chadwick Jr. 1994. Volcanic and hydrothermal processes associated with a recent phase of seafloor spreading at the northern Cleft segment: Juan de Fuca Ridge. Journal of Geophysical Research 99(B3):4,741–4,760, https://doi.org/10.1029/93JB02038.

Embley, R.W., W.W. Chadwick, Jr., E.T. Baker, D.A. Butterfield, J.A. Resing, C.E.J. de Ronde, V. Tunnicliffe, J.E. Lupton, S.K. Juniper, K.H. Rubin, and others. 2006. Long-term eruptive activity at a submarine arc volcano. Nature 441:494–497, https://doi.org/10.1038/nature04762.

Embley, R.W., W.W. Chadwick Jr., D. Clague, and D. Stakes. 1999. The 1998 eruption of Axial Volcano: Multibeam anomalies and seafloor observations. Geophysical Research Letters 26:3,425–3,428, https://doi.org/10.1029/1999GL002328.

Embley, R.W., W.W. Chadwick Jr., I.R. Jonasson, D.A. Butterfield, and E.T. Baker, 1995. Initial results of the rapid response to the 1993 CoAxial event: Relationships between hydrothermal and volcanic processes. Geophysical Research Letters 22:143–146, https://doi.org/10.1029/94GL02281.

Embley, R.W., W.W. Chadwick Jr., M.R. Perfit, and E.T. Baker. 1991. Geology of the northern Cleft segment, Juan de Fuca Ridge: Recent lava flows, sea-floor spreading, and the formation of megaplumes. Geology 19:771–775, https://doi.org/10.1130/0091-7613(1991)019<0771:GOTNCS>2.3.CO;2.

Embley, R.W., W.W. Chadwick Jr., M.R. Perfit, M.C. Smith, and J.R. Delaney. 2000. Recent eruptions on the CoAxial segment of the Juan de Fuca Ridge: Implications for mid-ocean ridge accretion processes. Journal of Geophysical Research 105:16,501–16,525, https://doi.org/10.1029/2000JB900030.

Embley, R.W., J.E. Lupton, G. Massoth, T. Urabe, V. Tunnicliffe, D.A. Butterfield, T. Shibata, O. Okano, M. Kinoshita, and K. Fujioka. 1998. Geological, chemical, and biological evidence for recent volcanism at 17.5°S: East Pacific Rise. Earth and Planetary Science Letters 163:131–147, https://doi.org/10.1016/S0012-821X(98)00181-2.

Embley, R.W., K.M. Murphy, and C.G. Fox. 1990. High resolution studies of the summit of Axial Volcano. Journal of Geophysical Research 95:12,785–12,812, https://doi.org/10.1029/JB095iB08p12785.

Escartín, J., S.A. Soule, D.J. Fornari, M.A. Tivey, H. Schouten, and M.R. Perfit, 2007. Interplay between faults and lava flows in the construction of the upper oceanic crust: The East Pacific Rise crest 9°25’–9°58’N. Geochemistry Geophysics Geosystems 8, Q06005, https://doi.org/10.1029/2006GC001399.

Fornari, D.J., R.M. Haymon, M.R. Perfit, T.K.P. Gregg, and M. Edwards. 1998. Axial summit trough of the East Pacific Rise 9°–10°: Geologic characteristics and evolution of the axial zone on fast-spreading mid-ocean ridges. Journal of Geophysical Research 103:9,827–9,855, https://doi.org/10.1029/98JB00028.

Fornari, D.J., M.A. Tivey, H. Schouten, M. Perfit, D. Yoerger, A. Bradley, M. Edwards, R. Haymon, D. Scheirer, K. Von Damm, and others. 2004. Submarine lava flow emplacement at the East Pacific Rise 9°50’N: Implications for uppermost ocean crust stratigraphy and hydrothermal fluid circulation. Pp. 187–218 in Mid-Ocean Ridges: Hydrothermal Interactions Between the Lithosphere and Oceans. C.R. German, J. Lin, and L.M. Parson, eds, Geophysical Monograph Series, vol. 148, American Geophysical Union, Washington, DC.

Fornari, D.J., K.L. Von Damm, J.G. Bryce, J.P. Cowen, V. Ferrini, A. Fundis, M.D. Lilley, G.W. Luther III, L.S. Mullineaux, M.R. Perfit, and others. 2012. The East Pacific Rise between 9°N and 10°N: Twenty-five years of integrated, multidisciplinary oceanic spreading center studies. Oceanography 25(1):18–43, https://doi.org/10.5670/oceanog.2012.02.

Fox, C.G., W.W. Chadwick Jr., and R.W. Embley. 1992. Detection of changes in ridge-crest morphology using repeated multibeam sonar surveys. Journal of Geophysical Research 97:11,149–11,162, https://doi.org/10.1029/92JB00601.

Fox, C.G., W.W. Chadwick Jr., and R.W. Embley. 2001. Direct observation of a submarine volcanic eruption from a sea-floor instrument caught in a lava flow. Nature 412:727–729, https://doi.org/10.1038/35089066.

Fox, C.G., and R.P. Dziak. 1998. Hydroacoustic detection of volcanic activity on the Gorda Ridge, February–March. 1996. Deep Sea Research Part II 45:2,513–2,530, https://doi.org/10.1016/S0967-0645(98)00081-2.

Fox, C.G., R.P. Dziak, H. Matsumoto, and A.E. Schreiner. 1994. Potential for monitoring low-level seismicity on the Juan de Fuca Ridge using military hydrophone arrays. Journal of the Marine Technology Society 27:22–30.

Fox, C.G., K.M. Murphy, and R.W. Embley. 1988. Automated display and statistical analysis of interpreted deep-sea bottom photographs. Marine Geology 78:199–216, https://doi.org/10.1016/0025-3227(88)90109-0.

Fox, C.G., W.E. Radford, R.P. Dziak, T.K. Lau, H. Matsumoto, and A.E. Schreiner. 1995. Acoustic detection of a seafloor spreading episode on the Juan de Fuca Ridge using military hydrophone arrays. Geophysical Research Letters 22(2):131–134, https://doi.org/10.1029/94GL02059.

Francheteau, J., T. Juteau, and C. Rangan. 1979. Basaltic pillars in collapsed lava-pools on the deep ocean-floor. Nature 281:209–211, https://doi.org/10.1038/281209a0.

Fundis, A., S. Soule, D.J. Fornari, and M.R. Perfit. 2010. Paving the seafloor: Volcanic emplacement processes during the 2005–2006 eruption at the fast-spreading East Pacific Rise, 9°50’N. Geochemistry Geophysics Geosystems, https://doi.org/10.1029/2010GC003058.

Garcia, M.O., K.H. Rubin, M.D. Norman, J.M. Rhodes, D.W. Graham, K. Spencer, and D. Muenow. 1998. Petrology and geochronology of basalt breccia from the 1996 earthquake swarm of Loihi Seamount, Hawaii: Magmatic history of its 1996 eruption. Bulletin of Volcanology 59:577–592, https://doi.org/10.1007/s004450050211.

Goss, A.R., M.R. Perfit, W.I. Ridley, K.H. Rubin, G.D. Kamenov, S.A. Soule, A. Fundis, and D.J. Fornari. 2010. Geochemistry of lavas from the 2005–2006 eruption at the East Pacific Rise, 9°46’N–9°56’N: Implications for ridge crest plumbing and decadal changes in magma chamber compositions. Geochemistry Geophysics Geosystems 11, Q05T09, https://doi.org/10.1029/2009GC002977.

Gregg, T.K.P., and J.H. Fink. 1995. Quantification of submarine lava-flow morphology through analog experiments. Geology 23:73–76, https://doi.org/10.1130/0091-7613(1995)023<0073:QOSLFM>2.3.CO;2.

Gregg, T.K.P., D.J. Fornari, M.R. Perfit, R.M. Haymon, and J.H. Fink. 1996. Rapid emplacement of a mid-ocean ridge lava flow on the East Pacific Rise at 9°46’–51’N. Earth and Planetary Science Letters 144:E1–E7, https://doi.org/10.1016/S0012-821X(96)00179-3.

Gregg, T.K.P., and D.K. Smith. 2003. Volcanic investigations of the Puna Ridge, Hawaii: Relations of lava flow morphologies and underlying slopes. Journal of Volcanology and Geothermal Research 126:63–77, https://doi.org/10.1016/S0377-0273(03)00116-1.

Gudmundsson, A. 2000. Dynamics of volcanic systems in Iceland: Example of tectonism and volcanism at juxtaposed hot spot and mid-ocean ridge systems. Annual Review of Earth and Planetary Sciences 28:107–140, https://doi.org/10.1146/annurev.earth.28.1.107.

Hall, M. 1876. Note upon a portion of basalt from the Mid-Atlantic. The Mineralogical Magazine and Journal 1:1–3.

Harding, A.J., G.M. Kent, and J.A. Orcutt. 1993. A multichannel seismic investigation of upper crustal structure at 9°N on the East Pacific Rise: Implications for crustal accretion. Journal of Geophysical Research 98(B8):13,925–13,944, https://doi.org/10.1029/93JB00886.

Haymon, R.M., D.J. Fornari, K.L. Von Damn, M.D. Lilley, M.R. Perfit, J.M. Edmond, W.C. Shanks, R.A. Lutz, J.M. Grebmeier, S. Carbotte, and others. 1993. Volcanic eruption of the mid-ocean ridge along the East Pacific Rise crest at 9°45–52’N: Direct submersible observations of seafloor phenomena associated with an eruption event in April 1991. Earth and Planetary Science Letters 119:85–101, https://doi.org/10.1016/0012-821X(93)90008-W.

Helo, C., M.A. Longpre, N. Shimizu, D.A. Clague, and J. Stix. 2011. Explosive eruptions at mid-ocean ridges driven by CO2-rich magmas. Nature Geoscience 4:260–263, https://doi.org/10.1038/NGEO1104.

Hon, K., J. Kauahikaua, R. Denlinger, and K. Mackay. 1994. Emplacement and inflation of pahoehoe sheet flows: Observations and measurements of active lava flows on Kilauea volcano, Hawaii. Geological Society of America Bulletin 106:351–370, https://doi.org/10.1130/0016-7606(1994)106<0351:EAIOPS>2.3.CO;2.

Johnson, K.T.M., D.W. Graham, K.H. Rubin, K. Nicolaysen, D.S. Scheirer, D.W. Forsyth, E.T. Baker, and L.M. Douglas-Priebe. 2000. Boomerang Seamount: The active expression of the Amsterdam-St. Paul hotspot, Southeast Indian Ridge. Earth and Planetary Science Letters 183:245–259, https://doi.org/10.1016/S0012-821X(00)00279-X.

Kelley, D.S., J.A. Baross, and J.R. Delaney. 2002. Volcanoes, fluids, and life at ridge spreading centers. Annual Review of Earth and Planetary Sciences 30:385–491, https://doi.org/10.1146/annurev.earth.30.091201.141331.

Kelley, D.S., S.M. Carbotte, D.W. Caress, D.A. Clague, J.R. Delaney, J.B. Gill, H. Hadaway, J.F. Holden, E.E.E. Hooft, J.P. Kellogg, and others. 2012. Endeavour Segment of the Juan de Fuca Ridge: One of the most remarkable places on Earth. Oceanography 25(1):44–61, https://doi.org/10.5670/oceanog.2012.03.

Kim, S.L., and L.S. Mullineaux. 1998. Distribution and near-bottom transport of larvae and other plankton at hydrothermal vents. Deep Sea Research Part II 45:423–440, https://doi.org/10.1016/S0967-0645(97)00042-8.

Lonsdale, P. 1977. Abyssal pahoehoe with lava coils at the Galapagos rift. Geology 5:147–152, https://doi.org/10.1130/0091-7613(1977)5<147:APWLCA>2.0.CO;2.

Luther, G.W. III, T.F. Rozan, M. Taillefert, D.B. Nuzzio, C. Di Meo, T.M. Shank, R.A. Lutz, and S.C. Cary. 2001. Chemical speciation drives hydrothermal vent ecology. Nature 410:813–816, https://doi.org/10.1038/35071069.

Macdonald, K.C. 1998. Linkages between faulting, volcanism, hydrothermal activity and segmentation on fast spreading centers. Pp. 27–58 in Faulting and Magmatism at Mid-Ocean Ridges. R. Buck, T. Delaney, A. Karson, and Y. Lagabrielle, eds, Geophysical Monograph Series, vol. 106, American Geophysical Union, Washington, DC.

Macdonald, K.C., P.J. Fox, S. Miller, S. Carbotte, M. Edwards, M. Eisen, D. J. Fornari, L. Perram, R. Pockalny, D. Scheirer, and others. 1992. The East Pacific Rise and its flanks 8–18°N: History of segmentation, propagation and spreading direction based on SeaMARC II and Sea Beam studies. Marine Geophysical Research 14:299–344, https://doi.org/10.1007/BF01203621.

Maicher, D., and J.D.L. White. 2001. The formation of deep-sea Limu o Pele. Bulletin of Volcanology 63:482–496, https://doi.org/10.1007/s004450100165.

Mastin, L.G., and J.B. Witter. 2000. The hazards of eruptions through lakes and seawater. Journal of Volcanology and Geothermal Research 97:195–214, https://doi.org/10.1016/S0377-0273(99)00174-2. 

MBARI Mapping Team. 2001. West Coast Seamounts and Ridges Multibeam Survey. MBARI Digital Data Series No. 7.

Murray, J., and A.F. Renard. 1891. Report on Deep-Sea Deposits Based on Specimens Collected During the Voyage of H.M.S. Challenger in the Years 1872 to 1876. H.M. Stationary Office, London, 525 pp.

Nooner, S.L., and W.W. Chadwick Jr. 2011. Quantifying the eruption cycle at Axial Seamount using submarine geodesy. Eos, Transactions, American Geophysical Union 92(52):Fall Meeting Supplement Abstract V52C-02.

Perfit, M.R., and W.W. Chadwick Jr. 1998. Magmatism at mid‐ocean ridges: Constraints from volcanological and geochemical investigations. Pp. 59–116 in Faulting and Magmatism at Mid-Ocean Ridges. R. Buck, T. Delaney, A. Karson, and Y. Lagabrielle, eds, Geophysical Monograph Series, vol. 106, American Geophysical Union, Washington, DC.

Resing, J., K.H. Rubin, R. Embley, J. Lupton, E.T. Baker, R. Dziak, T. Baumberger, M. Lilley, J. Huber, T. Shank, and others. 2011. Active submarine eruption of boninite in the northeastern Lau Basin. Nature Geoscience 4:799–806, https://doi.org/10.1038/NGEO1275.

Rubin, K.H., R.W. Embley, D.A. Clague, J.A. Resing, P.J. Michael, N.S. Keller, and E.T. Baker. 2009. Lavas from active boninite and very recent basalt eruptions at two submarine NE Lau Basin sites. Eos, Transactions, American Geophysical Union 90(52):Fall Meeting Supplement Abstract V43I-05.

Rubin, K.H., J.D. Macdougall, and M.R. Perfit. 1994. 210Po-210Pb dating of recent volcanic eruptions on the sea floor. Nature 368:841–844, https://doi.org/10.1038/368841a0.

Rubin, K.H., and J.M. Sinton. 2007. Inferences on mid-ocean ridge thermal and magmatic structure from MORB compositions. Earth and Planetary Science Letters 260:257–276, https://doi.org/10.1016/j.epsl.2007.05.035.

Rubin, K.H., M.C., Smith, E.C. Bergmanis, M.R. Perfit, J.M. Sinton, and R. Batiza. 2001. Geochemical heterogeneity within mid-ocean ridge lava flows: Insights into eruption, emplacement and global variations in magma generation. Earth and Planetary Science Letters 188:349–367, https://doi.org/10.1016/S0012-821X(01)00339-9.

Rubin, K.H., M.C., Smith, M.R. Perfit, D.M. Christie, and L.F. Sacks. 1998. Geochronology and geochemistry of lavas from the 1996 North Gorda Ridge eruption. Deep Sea Research Part II 45:2,571–2,597, https://doi.org/10.1016/S0967-0645(98)00084-8.

Rubin, K.H., M. Tolstoy, D.J. Fornari, R.P. Dziak, S.A. Soule, F. Waldhauser, and K.L. Von Damm. 2008. Integrating radiometric, geophysical and thermal signals of volcanic unrest and eruption in 2005–06 at 9°50’N EPR. Eos, Transactions, American Geophysical Union 89:Fall Meeting Supplement Abstract B23F-07.

Rubin, K.H., I. van der Zander, M.C. Smith, and E.C. Bergmanis. 2005. Minimum speed limit for ocean ridge magmatism from 210Pb-226Ra-230Th disequilibria. Nature 437:534–538, https://doi.org/10.1038/nature03993.

Schipper, C.I., J.D.L. White, and B.F. Houghton. 2011. Textural, geochemical, and volatile evidence for a Strombolian-like eruption sequence at Loihi Seamount, Hawai`i. Journal of Volcanology and Geothermal Research 207:16–32, https://doi.org/10.1016/j.jvolgeores.2011.08.001.

Schipper, C.I., J.D.L. White, B.F. Houghton, N. Shimizu, and R.B Stewart. 2010. Explosive submarine eruptions driven by volatile-coupled degassing at Loihi Seamount, Hawaii. Earth and Planetary Science Letters 295:497–510, https://doi.org/10.1016/j.epsl.2010.04.031.

Searle, R.C., B.J. Murton, K. Achenbach, T. LeBas, M. Tivey, I. Yeo, M.H. Cormier, J. Carlut, P. Ferreira, C. Mallows, and others. 2010. Structure and development of an axial volcanic ridge: Mid-Atlantic Ridge, 45°N. Earth and Planetary Science Letters 299:228–241, https://doi.org/10.1016/j.epsl.2010.09.003.

Shank, T.M., D.J. Fornari, K.L. Von Damm, M.D. Lilley, R.M. Haymon, and R.A. Lutz. 1998. Temporal and spatial patterns of biological community development at nascent deep-sea hydrothermal vents along the East Pacific Rise, 9°49.6’N–9°50.4’N. Deep Sea Research Part II 45:465–515, https://doi.org/10.1016/S0967-0645(97)00089-1.

Shank, T., D. Fornari, D. Yoerger, S. Humphris, A. Bradley, S. Hammond, J. Lupton, D. Scheirer, R. Collier, A.-L. Reysenbach, and others. 2003. Deep submergence synergy: Alvin and ABE explore the Galápagos Rift at 86°W. Eos, Transactions, American Geophysical Union 84(41):425, https://doi.org/10.1029/2003EO410001.

Shank, T.M., S. Hammond, D. Fornari, R. Waller, K. Ding, W. Seyfried, D. Butterfield, M.D. Lilley, M. Perfit. 2002. Time-series exploration and biological, geological, and geochemical characterization of the Rosebud and Calyfield hydrothermal vent fields at 86°W and 89.5°W on the Galapagos Rift. Eos, Transactions, American Geophysical Union 83:Fall Meeting Supplement Abstract T11C-1257.

Sims, K.W.W., S.R. Hart, M.K. Reagan, J. Blusztajn, H. Staudigel, R.A. Sohn, G.D. Layne, L.A. Ball, and J. Andrews. 2008. 238U-230Th-226Ra-210Pb-210Po, 232Th-228Ra, and 235U-231Pa constraints on the ages and petrogenesis of Vailulu’u and Malumalu Lavas, Samoa. Geochemistry Geophysics Geosystems 9, Q04003, https://doi.org/10.1029/2007GC001651.

Singh, S.C., W.C. Crawford, H. Carton, T. Seher, V. Combier, M. Cannat, J.P. Canales, D. Düsünür, J. Escartín, and J.M. Miranda, 2006. Discovery of a magma chamber and faults beneath a Mid-Atlantic Ridge hydrothermal field. Nature 442:1,029–1,032, https://doi.org/10.1038/nature05105.

Singh, S.C., G.M. Kent, J.S. Collier, A.J. Harding, and J.A. Orcutt. 1998. Melt to mush variations in crustal magma properties along the ridge crest at the southern East Pacific Rise. Nature 394:874–878, https://doi.org/10.1038/29740.

Sinton, J., E. Bergmanis, K.H. Rubin, R. Batiza, T.K.P Gregg, K. Grönvold, K. Macdonald, and S. White. 2002. Volcanic eruptions on mid-ocean ridges: New evidence from the superfast spreading East Pacific Rise, 17°–19°S. Journal of Geophysical Research 107(B6), 2115, https://doi.org/10.1029/2000JB000090.

Sinton, J.M., and R.S. Detrick. 1992. Mid-ocean ridge magma chambers. Journal of Geophysical Research 97:197–216, https://doi.org/10.1029/91JB02508.

Sinton, J.M., K. Grönvold, and K. Sæmundsson. 2005. Postglacial eruptive history of the Western Volcanic Zone, Iceland. Geochemistry Geophysics Geosystems 6, Q12009, https://doi.org/10.1029/2005GC001021.

Sinton, J.M., S.M. White, A. Colman, K.H. Rubin, and J.A. Bowles. 2010. Volcanic eruptions on the western Galápagos Spreading Center: Connecting magma supply at depth to eruption rate on the surface. Eos, Transactions, American Geophysical Union 91(52):Fall Meeting Supplement Abstract V52A-06.

Small, C. 1998. Global systematics of mid-ocean ridge morphology. Pp. 59–115 in Faulting and Magmatism at Mid-Ocean Ridges. R. Buck, T. Delaney, A. Karson, and Y. Lagabrielle, eds, Geophysical Monograph Series, vol. 106, American Geophysical Union, Washington, DC.

Smith, D.K., and J.R. Cann. 1992. The role of seamount volcanism in crustal construction at the Mid-Atlantic Ridge (24°–30°N). Journal of Geophysical Research 97:1,645–1,658, https://doi.org/10.1029/91JB02507.

Smith, D.K., and T.H. Jordan. 1987. Seamount statistics in the Pacific Ocean. Journal of Geophysical Research 93:2,899–2,918, https://doi.org/10.1029/JB093iB04p02899.

Sohn, R.A., C. Willis, S.E. Humphris, T.M. Shank, H. Singh, H.N. Edmonds, C. Kunz, U. Hedman, E. Helmke, M. Jakuba, and others. 2008. Explosive volcanism on the ultraslow-spreading Gakkel ridge, Arctic Ocean. Nature 453:1,236–1,238, https://doi.org/10.1038/nature07075.

Soule, S.A., J. Escartín, and D.J. Fornari. 2009. A record of eruption and intrusion at a fast spreading ridge axis: Axial summit trough of the East Pacific Rise at 9–10°N. Geochemistry Geophysics Geosystems 10, Q10T07, https://doi.org/10.1029/2008GC002354.

Soule, S.A., D.J. Fornari, M.R. Perfit, and K.H. Rubin. 2007. New insights into mid-ocean ridge volcanic processes from the 2005–2006 eruption of the East Pacific Rise, 9°46’N–9°56’N. Geology 35(12):1,079–1,082, https://doi.org/10.1130/G23924A.1.

Soule, S.A., D.J. Fornari, M.R. Perfit, M.A. Tivey, W.I. Ridley, and H. Schouten. 2005. Channelized lava flows at the East Pacific Rise crest 9°–10°N: The importance of off-axis lava transport in developing the architecture of young oceanic crust. Geochemistry Geophysics Geosystems 6, Q08005, https://doi.org/10.1029/2005GC000912.

Spiess, F.N., K.C. Macdonald, T. Atwater, R. Ballard, A. Carranza, D. Cordoba, C. Cox, V.M. Diaz Garcia, J. Francheteau, J. Guerrero, and others. 1980. East Pacific Rise: Hot springs and geophysical experiments. Science 207:1,421–1,433, https://doi.org/10.1126/science.207.4438.1421.

Stakes, D.S., M.R. Perfit, M.A. Tivey, D.W. Caress, T. Ramirez, and N. Maher. 2006. The Cleft revealed: Geologic, magnetic, and morphologic evidence for construction of upper oceanic crust along the southern Juan de Fuca Ridge. Geochemistry Geophysics Geosystems 7, Q04003, https://doi.org/10.1029/2005GC001038.

Staudigel, H., S.R Hart, A. Piled, B.E. Bailey, E.T. Baker, S. Brooke, D.P. Connelly, L. Haucke, C.R. German, I. Hudson, and others. 2006. Vailulu’u Seamount, Samoa: Life and death on an active submarine volcano. Proceedings of the National Academy of Sciences of the United States of America 103:6,448–6,453, https://doi.org/10.1073/pnas.0600830103.

Stern, R.J., M.J. Fouch, and S. Klemperer. 2003. An overview of the Izu-Bonin-Mariana subduction factory. Pp. 175–222 in Inside the Subduction Factory. J. Eiler, ed., Geophysical Monograph Series, vol. 138, American Geophysical Union, Washington, DC.

The 1996 Loihi Science Team. 1997. Researchers rapidly respond to submarine activity at Loihi Volcano, Hawaii. Eos, Transactions, American Geophysical Union 78(22):229, https://doi.org/10.1029/97EO00150.

Tivey, M.K. 1995. The influence of hydrothermal fluid composition and advection rates on black smoker chimney mineralogy: Insights from modeling transport and reaction. Geochimica et Cosmochimica Acta 59:1,933–1,949, https://doi.org/10.1016/0016-7037(95)00118-2.

Tolstoy, M., J.P. Cowen, E.T. Baker, D.J. Fornari, K.H. Rubin, T.M. Shank, F. Waldhauser, D.R. Bohnenstiehl, D.W. Forsyth, R.C. Holmes, and others. 2006. A sea-floor spreading event captured by seismometers. Science 314:1,920–1,922, https://doi.org/10.1126/science.1133950.

Tunnicliffe, V., J. Baross, A.V. Gebruk, O. Giere, A. Koschinsky, A. Reysenbach, T.M. Shank, and M. Summit. 2003. Interactions between biotic processes at vents and physical, chemical, and geological conditions. Pp. 251–270 in Energy and Mass Flux Through the Biological Component of Hydrothermal Vent Systems. V. Tunnicliffe and C. German, eds, Dahlem University Press.

Von Damm, K.L. 2000. Chemistry of hydrothermal vent fluids from 9–10°N, East Pacific Rise: “Time zero,” the immediate post-eruptive period. Journal of Geophysical Research 105:(B5)11,203–11,222, https://doi.org/10.1029/1999JB900414.

Von Damm, K.L. 2004. Evolution of the hydrothermal system at East Pacific Rise 9°50’N: Geochemical evidence for changes in the upper oceanic crust. Pp. 285–304 in Mid-Ocean Ridges: Hydrothermal Interactions Between the Lithosphere and Ocean. C.R. German, J. Lin, and L.M. Parson, eds, Geophysical Monograph Series, vol. 148, American Geophysical Union, Washington, DC.

Wadge, G. 1982. Steady state volcanism: Evidence from eruption histories of polygenetic volcanoes. Journal of Geophysical Research 87:4,035–4,049, https://doi.org/10.1029/JB087iB05p04035.

White, S.M., R.H. Haymon, D.J. Fornari, M.R. Perfit, and K.C. Macdonald. 2002. Correlation between volcanic and tectonic segmentation of fast-spreading ridges: Evidence from volcanic structures and lava flow morphology on the East Pacific Rise at 9°–10°N. Journal of Geophysical Research 107(B8):2,173, https://doi.org/10.1029/2001JB000571.

Wolery, T.J., and N.H. Sleep. 1976. Hydrothermal circulation and geochemical flux at mid-ocean ridges. Journal of Geology 84:249–275.

Yeo, I.A., D.A. Clague, J.B. Paduan, D.W. Caress. 2010. New insights into diking processes from high resolution bathymetry of pillow ridges on the Juan de Fuca and Gorda Ridges. Eos, Transactions, American Geophysical Union 91(52):Fall Meeting Supplement Abstract V11A-2236.

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