THICKNESS OF A SUBMARINE LAVA FLOW DETERMINED FROM NEAR-BOTTOM MAGNETIC-FIELD MAPPING BY AUTONOMOUS UNDERWATER VEHICLE

Citation
Ma. Tivey et al., THICKNESS OF A SUBMARINE LAVA FLOW DETERMINED FROM NEAR-BOTTOM MAGNETIC-FIELD MAPPING BY AUTONOMOUS UNDERWATER VEHICLE, Geophysical research letters, 25(6), 1998, pp. 805-808
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary
ISSN journal
0094-8276
Volume
25
Issue
6
Year of publication
1998
Pages
805 - 808
Database
ISI
SICI code
0094-8276(1998)25:6<805:TOASLF>2.0.ZU;2-9
Abstract
Magnetic field surveys obtained near the seafloor can map the boundari es of recent volcanic eruptions and can provide thickness estimates of these lava flow units independent of bathymetry differencing methods. Magnetic thickness estimation requires knowledge of the intensity of magnetization of the new lava and surrounding terrain, but this can be satisfactorily obtained by representative sampling of the various vol canic units. While bathymetry differencing requires pre-existing data to assess the thickness of new lava eruptions, magnetic surveys can be obtained after an eruption has occurred. In this study, near-bottom m agnetic surveys were obtained using an autonomous underwater vehicle ( AUV), which operates without a tether or human intervention. AW techno logy offers rapid deployment and an efficient surveying approach for r emotely mapping recent lava eruption sites on the seafloor.