MARKER FOR DETECTING UNDERGROUND BURIED BODY

PURPOSE:To accurately detect a weak radio wave over a wide range by providing a marker which is formed by mounting a resonance element on a magnetic nonpermeable plate body to an underwater buried body so that the resonance element faces the surface of the ground. CONSTITUTION:The resonance element 1 is mounted on a late body 2 so that the center of a coil is nearly coincident with the center of the magnetic nonpermeable plate body 2, thereby forming the marker. The marker is buried right above the underground buried body and used so that the element 1 faces the surface of the ground and the plate body 2 is parallel to the surface of the ground. Consequently, an electromagnetic field under the ground is intercepted by the plate body 2 to reduce the influence of the electromagnetic field. Consequently, a weak radio wave is accurately detected over a wide range.