Synthetic case study: discrimination of unexploded ordnance (UXO) and non-UXO sources with varying remanent magnetization strength using magnetic data

SUMMARY We investigate if it is theoretically possible to discriminate between unexploded ordnance (UXO) and non-UXO sources by modelling the magnetic dipole moment for ferrous objects of different shapes sizes. This carried out approximating volumetric demagnetization factors rectangular prisms, representing similar a long rod or flat steel plate. By UXO as prolate spheroids can be determined which compared with response prism. The inversion in probabilistic framework, where forward model are assigned individual prior models terms shape, size, orientation remanent magnetization object. 95 independent realizations prism generated make synthetic anomalies exemplifying objects, inverted using model. It investigated an identical produced two how well resolved measured anomaly. case study steps we first have little information expected properties another introduced values aspect ratio size 24 UXO, that often encountered North Sea. With no discrimination at many times implausible, unless elongated considered, not reproduced spheroid. Introducing achieve much better rate when list properties. account higher allowed prior, still high capabilities comparison prior.