Marine UXO detection: Critical analysis of the magnetic workflow

PreviousNext No AccessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2021Marine UXO detection: Critical analysis of the magnetic workflowAuthors: Sara Lise UnderhayMark E. VardyTimothy J. HenstockSara Lise UnderhayUniversity of SouthamptonSearch for more papers by this author, Mark E. VardySAND GeophysicsSearch for more papers by this author, and Timothy J. HenstockUniversity of SouthamptonSearch for more papers by this authorhttps://doi.org/10.4133/sageep.33-188 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract The standard workflow for marine magnetic surveys relies heavily on the assumption that the analytic signal amplitude and position of maxima provide reliable information about the size and location of the potential UneXploded Ordnance (UXO). Here we present studies using synthetic data that demonstrate how the aspect ratio (length/width), orientation and geographic location of the UXO can significantly affect the amplitude and shape of the analytic signal and cause the peak to migrate away from the center of the target. The implications of this for UXO site surveys are two-fold. Firstly, the dependence of the signal amplitude on the target orientation and geographic location mean that potentially important UXO could be disregarded if a simple amplitude thresholding is used to isolate potential targets. Secondly, the complex relationship between the target shape/orientation and location of the signal peak can cause positional errors of up to several meters, which are critical for subsequent mitigation procedures. Keywords: acquisition, magnetometer, remanent magnetization, mathematical transform, permeabilityPermalink: https://doi.org/10.4133/sageep.33-188FiguresReferencesRelatedDetails Symposium on the Application of Geophysics to Engineering and Environmental Problems 2021ISSN (online):1554-8015Copyright: 2021 Pages: 349 publication data© 2021 Published in electronic format with permission by the Society of Exploration Geophysicists and Environment and Engineering Geophysical SocietyPublisher:Environmental & Engineering Geophysical Society HistoryPublished: 11 Jun 2021 CITATION INFORMATION Sara Lise Underhay, Mark E. Vardy, and Timothy J. Henstock, (2021), "Marine UXO detection: Critical analysis of the magnetic workflow," Symposium on the Application of Geophysics to Engineering and Environmental Problems Proceedings : 336-343. https://doi.org/10.4133/sageep.33-188 Plain-Language Summary Keywordsacquisitionmagnetometerremanent magnetizationmathematical transformpermeabilityPDF DownloadLoading ...