@article {Chadwick2016,
	title = {{Voluminous eruption from a zoned magma body after an increase in supply rate at Axial Seamount}},
	journal = {Geophysical Research Letters},
	volume = {43},
	year = {2016},
	pages = {12,063{\textendash}12,070},
	abstract = {Axial Seamount is the best monitored submarine volcano in the world, providing an exceptional window into the dynamic interactions between magma storage, transport, and eruption processes in a mid-ocean ridge setting. An eruption in April 2015 produced the largest volume of erupted lava since monitoring and mapping began in the mid-1980s after the shortest repose time, due to a recent increase in magma supply. The higher rate of magma replenishment since 2011 resulted in the eruption of the most mafic lava in the last 500{\textendash}600 years. Eruptive fissures at the volcano summit produced pyroclastic ash that was deposited over an area of at least 8 km2. A systematic spatial distribution of compositions is consistent with a single dike tapping different parts of a thermally and chemically zoned magma reservoir that can be directly related to previous multichannel seismic-imaging results.},
	keywords = {AUV Sentry (Autonomous Underwater Vehicle), ROV Jason (Remotely Operated Vehicle)},
	doi = {10.1002/2016GL071327},
	author = {Chadwick, W W and Paduan, J B and Clague, D A and Dreyer, B M and Merle, S G and Bobbitt, A M and Caress, D W and Philip, B T and Kelley, D S and Nooner, S L}
}
@article {ISI:000351847600028,
	title = {{Long-term explosive degassing and debris flow activity at West Mata submarine volcano}},
	journal = {GEOPHYSICAL RESEARCH LETTERS},
	volume = {42},
	number = {5},
	year = {2015},
	month = {mar},
	pages = {1480{\textendash}1487},
	type = {Article},
	abstract = {West Mata is a 1200m deep submarine volcano where explosive boninite eruptions were observed in 2009. The acoustic signatures from the volcano{\textquoteright}s summit eruptive vents Hades and Prometheus were recorded with an in situ (similar to 25m range) hydrophone during ROV dives in May 2009 and with local (similar to 5km range) moored hydrophones between December 2009 and August 2011. The sensors recorded low frequency (1-40Hz), short duration explosions consistent with magma bubble bursts from Hades, and broadband, 1-5min duration signals associated with episodes of fragmentation degassing from Prometheus. Long-term eruptive degassing signals, recorded through May 2010, preceded a several month period of declining activity. Degassing episodes were not recorded acoustically after early 2011, although quieter effusive eruption activity may have continued. Synchronous optical measurements of turbidity made between December 2009 and April 2010 indicate that turbidity maxima resulted from occasional south flank slope failures triggered by the collapse of accumulated debris during eruption intervals.},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {0094-8276},
	doi = {10.1002/2014GL062603},
	author = {Dziak, R P and Bohnenstiehl, D R and Baker, E T and Matsumoto, H and Caplan-Auerbach, J and Embley, R W and Merle, S G and Walker, S L and Lau, T-K. and Chadwick Jr., W W}
}
@article {ISI:000345545100011,
	title = {{The Anatomy of a Buried Submarine Hydrothermal System, Clark Volcano, Kermadec Arc, New Zealand}},
	journal = {ECONOMIC GEOLOGY},
	volume = {109},
	number = {8},
	year = {2014},
	month = {dec},
	pages = {2261{\textendash}2292},
	type = {Article},
	abstract = {Clark volcano of the Kermadec arc, northeast of New Zealand, is a large stratovolcano comprised of two coalescing volcanic cones; an apparently younger, more coherent, twin-peaked edifice to the northwest and a relatively older, more degraded and tectonized cone to the southeast. High-resolution water column surveys show an active hydrothermal system at the summit of the NW cone largely along a ridge spur connecting the two peaks, with activity also noted at the head of scarps related to sector collapse. Clark is the only known cone volcano along the Kermadec arc to host sulfide mineralization. Volcano-scale gravity and magnetic surveys over Clark show that it is highly magnetized, and that a strong gravity gradient exists between the two edifices. Modeling suggests that a crustal-scale fault lies between these two edifices, with thinner crust beneath the NW cone. Locations of regional earthquake epicenters show a southwest-northeast trend bisecting the two Clark cones, striking northeastward into Tangaroa volcano. Detailed mapping of magnetics above the NW cone summit shows a highly magnetized ring structure 350 m below the summit that is not apparent in the bathymetry; we believe this structure represents the top of a caldera. Oblate zones of low (weak) magnetization caused by hydrothermal fluid upflow, here termed burn holes, form a pattern in the regional magnetization resembling Swiss cheese. Presumably older burn holes occupy the inner margin of the ring structure and show no signs of hydrothermal activity, while younger burn holes are coincident with active venting on the summit. A combination of mineralogy, geochemistry, and seafloor mapping of the NW cone shows that hydrothermal activity today is largely manifest by widespread diffuse venting, with temperatures ranging between 56 degrees and 106 degrees C. Numerous, small ({\textless}= 30 cm high) chimneys populate the summit area, with one site host to the similar to 7-m-tall {\textquoteleft}{\textquoteleft}Twin Towers{\{}{\textquoteright}{\textquoteright}{\}} chimneys with maximum vent fluid temperatures of 221 degrees C (pH 4.9), consistent with delta S-34(anhydrite-pyrite) values indicating formation temperatures of similar to 228 degrees to 249 degrees C. Mineralization is dominated by pyrite-marcasite-barite-anhydrite. Radiometric dating using the Ra-228/Ra-226 and Ra-226/Ba methods shows active chimneys to be {\textless}20 with most {\textless}2 years old. However, the chimneys at Clark show evidence for mixing with, and remobilizing of, barite as old as 19,000 years. This is consistent with Nd and Sr isotope compositions of Clark chimney and sulfate crust samples that indicate mixing of similar to 40{\%} seawater with a vent fluid derived from low K lavas. Similarly, REE data show the hydrothermal fluids have interacted with a plagioclase-rich source rock. A holistic approach to the study of the Clark hydrothermal system has revealed a two-stage process whereby a caldera-forming volcanic event preceded a later cone-building event. This ensured a protracted (at least 20 ka yrs) history of hydrothermal activity and associated mineral deposition. If we assume at least 200-m-high walls for the postulated (buried) caldera, then hydrothermal fluids would have exited the seafloor 20 ka years ago at least 550 m deeper than they do today, with fluid discharge temperatures potentially much hotter (similar to 350 degrees C). Subsequent to caldera infilling, relatively porous volcaniclastic and other units making up the cone acted as largescale filters, enabling ascending hydrothermal fluids to boil and mix with seawater subseafloor, effectively removing the metals (including remobilized Cu) in solution before they reached the seafloor. This has implications for estimates for the metal inventory of seafloor hydrothermal systems pertaining to arc hydrothermal systems.},
	keywords = {AUV ABE (Autonomous Benthic Explorer), AUV Sentry (Autonomous Underwater Vehicle)},
	issn = {0361-0128},
	author = {de Ronde, C E J and Walker, S L and Ditchburn, R G and Tontini, F Caratori and Hannington, M D and Merle, S G and Timm, C and Handler, M R and Wysoczanski, R J and Dekov, V M and Kamenov, G D and Baker, E T and Embley, R W and Lupton, J E and Stoffers, P}
}
@article {Embley2014,
	title = {{Eruptive modes and hiatus of volcanism at West Mata seamount, NE Lau basin: 1996{\textendash}2012}},
	journal = {Geochemistry, Geophysics, Geosystems},
	volume = {15},
	number = {10},
	year = {2014},
	pages = {4093{\textendash}4115},
	abstract = {We present multiple lines of evidence for years to decade-long changes in the location and character of volcanic activity at West Mata seamount in the NE Lau basin over a 16 year period, and a hiatus in summit eruptions from early 2011 to at least September 2012. Boninite lava and pyroclasts were observed erupting from its summit in 2009, and hydroacoustic data from a succession of hydrophones moored nearby show near-continuous eruptive activity from January 2009 to early 2011. Successive differencing of seven multibeam bathymetric surveys of the volcano made in the 1996{\textendash}2012 period reveals a pattern of extended constructional volcanism on the summit and northwest flank punctuated by eruptions along the volcano{\textquoteright}s WSW rift zone (WSWRZ). Away from the summit, the volumetrically largest eruption during the observational period occurred between May 2010 and November 2011 at \~{}2920 m depth near the base of the WSWRZ. The (nearly) equally long ENE rift zone did not experience any volcanic activity during the 1996{\textendash}2012 period. The cessation of summit volcanism recorded on the moored hydrophone was accompanied or followed by the formation of a small summit crater and a landslide on the eastern flank. Water column sensors, analysis of gas samples in the overlying hydrothermal plume and dives with a remotely operated vehicle in September 2012 confirmed that the summit eruption had ceased. Based on the historical eruption rates calculated using the bathymetric differencing technique, the volcano could be as young as several thousand years.},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	doi = {10.1002/2014GC005387},
	author = {Embley, R W and Merle, S G and Baker, E T and Rubin, K H and Lupton, J E and Resing, J A and Dziak, R P and Lilley, M D and Chadwick, W W and Shank, T M and Greene, R and Walker, S L and Haxel, J H and Olson, E J and Baumberger, T}
}
@article {Clague2011,
	title = {{Volcanic morphology of West Mata Volcano, NE Lau Basin, based on high-resolution bathymetry and depth changes}},
	journal = {Geochemistry, Geophysics, Geosystems},
	volume = {12},
	year = {2011},
	month = {nov},
	pages = {QOAF03{\textendash}QOAF03},
	publisher = {AMER GEOPHYSICAL UNION},
	address = {WASHINGTON; 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA},
	abstract = {High-resolution (1.5 m) mapping from the autonomous underwater vehicle (AUV) D. Allan B. of West Mata Volcano in the northern Lau Basin is used to identify the processes that construct and modify the volcano. The surface consists largely of volcaniclastic debris that forms smooth slopes to the NW and SE, with smaller lava flows forming gently sloping plateaus concentrated along the ENE and WSW rift zones, and more elongate flows radiating from the summit. Two active volcanic vents, Prometheus and Hades, are located \~{}50 and \~{}150 m WSW of the 1159 m summit, respectively, and are slightly NW of the ridgeline so the most abundant clastic deposits are emplaced on the NW flank. This eruptive activity and the location of vents appears to have been persistent for more than a decade, based on comparison of ship-based bathymetric surveys in 1996 and 2008{\textendash}2010, which show positive depth changes up to 96 m on the summit and north flank of the volcano. The widespread distribution of clastic deposits downslope from the rift zones, as well as from the current vents, suggests that pyroclastic activity occurs at least as deep as 2200 m. The similar morphology of additional nearby volcanoes suggests that they too have abundant pyroclastic deposits.},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {1525-2027},
	doi = {10.1029/2011GC003791},
	author = {Clague, D A and Paduan, J B and Caress, D W and Thomas, Hans and Chadwick, W W and Merle, S G}
}
@article {Chadwick2008,
	title = {{Direct video and hydrophone observations of submarine explosive eruptions at NW Rota-1 volcano, Mariana arc}},
	journal = {Journal of Geophysical Research},
	volume = {113},
	year = {2008},
	pages = {B08S10},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {0148-0227},
	doi = {10.1029/2007JB005215},
	url = {http://dx.doi.org/10.1029/2007JB005215},
	author = {Chadwick, W W and Cashman, K V and Embley, R W and Matsumoto, H and Dziak, R P and de Ronde, C E J and Lau, T K and Deardorff, N D and Merle, S G}
}
@article {Walker2008a,
	title = {{Eruption-fed particle plumes and volcaniclastic deposits at a submarine volcano: NW Rota-1, Mariana Arc}},
	journal = {Journal of Geophysical Research},
	volume = {113},
	year = {2008},
	pages = {B08S11},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {0148-0227},
	doi = {10.1029/2007JB005441},
	url = {http://dx.doi.org/10.1029/2007JB005441},
	author = {Walker, S L and Baker, E T and Resing, J A and Chadwick, W W and Lebon, G T and Lupton, J E and Merle, S G}
}
@article {Embley2007,
	title = {{Exploring the submarine ring of fire: Mariana Arc-Western Pacific}},
	journal = {Oceanography},
	volume = {20},
	number = {4},
	year = {2007},
	pages = {69{\textendash}80},
	keywords = {HOV Alvin (Human Occupied Vehicle), ROV Jason (Remotely Operated Vehicle)},
	issn = {1042-8275},
	doi = {10.5670/oceanog.2007.07},
	author = {Embley, R W and Baker, E T and Butterfield, D A and Chadwick, W W and Lupton, J E and Resing, J A and de Ronde, C E J and Nakamura, K I and Tunnicliffe, V and Dower, J F and Merle, S G}
}
