West mata. West Mata

Is West Mata Volcano Active?

The group uses related laboratory-based studies direct gas sampling and analysis, melt inclusions to provide new data for direct degassing of deep earth carbon to the atmosphere.

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Deep

Video of this volcanic activity is used to constrain simple numerical models and produce the first subaqueous eruption actualistic model driven by visual observations. SM processed and analyzed ship-based and AUV-based multibeam sonar bathymetric data.

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West Mata Eruption Video 2009 on Vimeo

Additional evidence that the eruptive activity directly observed during the brief ROV dives in May 2009 was continuous and prolonged for months to years comes from local and regional hydrophone studies, radiometric dating, and repeated hydrothermal plume measurements in the water column over the volcano. The high-standing areas remaining between Hades and Prometheus may have escaped significant collapse , perhaps because the former vent areas are underlain by relatively massive intrusive rocks.

Deep

Site 5: The 2010—2011 Eruption on the Deep WSW Rift at 2950 mbsl In December 2017, we also made ROV SuBastian dive S95 on two older areas of depth change sites 5—6, documented on the deep WSW rift zone by. The orientation of the pillow ridge may have been influenced by basement structure nearby, as it is parallel to an older sedimented and tectonized ridge NE of the volcano. One of the tasks on the cruise was to sample an active lava pillow.

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West Mata Volcano, Tonga, Tonga Islands

These tumuli are the shallowest features on the 2012—2016 lava flows , and are in line with the long-axis of the large dome of uplifted sediment, so may overlie the eruptive vents for the lava flows.

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West Mata Volcano, Tonga, Tonga Islands

The uplifted sediments were surrounded by hummocky seafloor that appeared to be young lava flows that flowed around the uplift without a clearly defined eruptive vent.

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