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Authors: Embriaco, D.* 
Carmisciano, C.* 
Caratori Tontini, F.* 
Stefanelli, P.* 
Cocchi, L.* 
Locritani, M.* 
De Marte, M.* 
Title: Environmental magneto-gradiometric marine survey in high anthropic noisy area
Issue Date: 2008
Keywords: environmental reclamation
anthropic noise
magneto-gradiometric survey
Subject Classification04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetism 
Abstract: We describe the magneto-gradiometric survey performed in the Mar Piccolo of Taranto, Italy in May 2005 for environmental aims. This region, being a noisy harbour environment, provides a challenging test for magnetic methods. To reduce the spurious noise signals, both of temporal and spatial origin, we used two Geometrics G880 caesium magnetometers towed in transverse gradient configuration. We show how in shallow waters this gradiometric configuration allows one to distinguish the anomalies due to small metallic bodies near the seafloor from the induced noise due to anthropic contribution and geomagnetic field variations. A direct visual inspection confirmed that the peculiarities highlighted in the gradient anomaly map were due to abandoned metallic objects founded on the seafloor.
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