Lava morphology mapping by expert system classification of high-resolution side-scan sonar imagery from the East Pacific Rise, 9°–10°N |
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Authors: | Jason D Meyer Scott M White |
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Institution: | (1) Department of Geological Sciences, University of South Carolina, 701 Sumter Street, EWS 617, Columbia, SC 29208, USA |
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Abstract: | Fine-scale lava morphology has been classified on the ridge crest of the East Pacific Rise between 9°15′N and 10°02′N using
an expert system classification method. This method establishes the means to classify complicated seafloor environments by
integrating textural and geometric feature attributes from a high-resolution side-scan sonar dataset where ground-reference
data are available from near-bottom visual observations. The classification in this study focuses upon mapping the lava morphology
distribution of sheet, lobate, and pillow flows along the East Pacific Rise. The reliability of the classification has been
evaluated using an accuracy assessment. The study region yields a coverage area of 37,814 m2 (44%) for lobate flows; 10,421 m2 (12%) for pillow flows; 15,096 m2 (18%) for sheet flows; 19,679 m2 (23%) for fissured areas; and 2,967 m2 (3%) for shadows or no data. The systematic distribution of lava morphology along the ridge found in this study supports
the idea of using the regional distribution of surface morphology as an indicator of emplacement dynamics and supports an
organization of the volcanic plumbing system at a third order segmentation scale beneath mid-ocean ridges. |
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Keywords: | Classification Side-scan sonar GLCM Lava morphology Mid-ocean ridge Pillow basalt |
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