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Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
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Deep sea explosive eruptions may be not so different from subaerial eruptions
Gianluca Iezzi1,2, Gabriele Lanzafame3,4, Lucia Mancini5
1Department of Engineering and Geology, G. D'Annunzio University, Chieti, Italy.
Scientific Reports
|April 23, 2020
Summary
Deep-sea volcanic eruptions are poorly understood. This study reveals that Strombolian-like submarine eruptions, similar to those above water, occur when a gas cloud forms around the vent.
Area of Science:
- * Volcanology
- * Marine Geology
Background:
- * Deep-sea explosive eruptions remain poorly understood due to limited accessibility.
- * Submarine eruption dynamics, pyroclast dispersion, and differences from subaerial eruptions require further investigation.
Purpose of the Study:
- * To analyze ash deposits from two submarine eruptions at Marsili Seamount.
- * To investigate magma-water interaction, eruptive column heights, and sea current velocities.
Main Methods:
- * Analysis of ash layers from proximal and distal deposits.
- * Examination of ash morphology and bubbles using X-ray microtomography.
- * Application of gas solubility and ash dispersion models.
Main Results:
- * Fall deposits found over 1.5 km from the vent; volcanoclastic flows occurred near the cone flanks.
- * Ash textures indicate poor magma-water interaction and a gas-rich environment.
- * Modeled eruptive columns were 200–400 m high with sea currents <5 cm/s.
Conclusions:
- * Strombolian-like deep-sea eruptions resemble subaerial ones when a gas cloud is present.
- * Understanding these processes is crucial for assessing volcanic hazards in marine environments.
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