3D-reconstruction of recent volcanic activity from ROV video, Charles Darwin Seamounts, Cape Verdes.

Kwasnitschka, Tom, Hansteen, Thor H. , Kutterolf, Steffen , Freundt, Armin and Devey, Colin W. (2011) 3D-reconstruction of recent volcanic activity from ROV video, Charles Darwin Seamounts, Cape Verdes. [Talk] In: AGU Fall Meeting 2011. , 05.12.-09.12.2011, San Francisco, California, USA .

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Abstract

OS11C-06
As well as providing well-localized samples, Remotely Operated Vehicles (ROVs) produce huge quantities of visual data whose potential for geological data mining has seldom if ever been fully realized. We present a new workflow to derive essential results of field geology such as quantitative stratigraphy and tectonic surveying from ROV-based photo and video material. We demonstrate the procedure on the Charles Darwin Seamounts, a field of small hot spot volcanoes recently identified at a depth of ca. 3500m southwest of the island of Santo Antao in the Cape Verdes. The Charles Darwin Seamounts feature a wide spectrum of volcanic edifices with forms suggestive of scoria cones, lava domes, tuff rings and maar-type depressions, all of comparable dimensions. These forms, coupled with the highly fragmented volcaniclastic samples recovered by dredging, motivated surveying parts of some edifices down to centimeter scale. ROV-based surveys yielded volcaniclastic samples of key structures linked by extensive coverage of stereoscopic photographs and high-resolution video. Based upon the latter, we present our workflow to derive three-dimensional models of outcrops from a single-camera video sequence, allowing quantitative measurements of fault orientation, bedding structure, grain size distribution and photo mosaicking within a geo-referenced framework. With this information we can identify episodes of repetitive eruptive activity at individual volcanic centers and see changes in eruptive style over time, which, despite their proximity to each other, is highly variable.

Document Type: Conference or Workshop Item (Talk)
Keywords: Meereswissenschaften; Meerestechnologie; Informationswissenschaft; Informatics, Visualization and portrayal; Marine geology and geophysics, Seafloor morphology, geology, and geophysics; Marine geology and geophysics, Submergence instruments: ROV, AUV, submersibles; Volcanology, Subaqueous volcanism; Ocean sciences
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
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Date Deposited: 11 May 2012 10:00
Last Modified: 11 May 2012 10:00
URI: http://oceanrep.geomar.de/id/eprint/14277

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