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The use of thermography for land mine detection has become a topic of great interest in recent years. The thermal properties and burial depth of the buried object also play a role in the thermal signature at the surface. The objective of this contribution is to determine the effect of burial depth on thermal signature of buried metallic object. The object used in this work is steel material buried at depth ranging from 1 cm to 50 cm. The two buried objects used in this work are steel of 12cm x 12 cm surface area with thicknesses of 0.5 cm and 3cm respectively. The soil where the objects were buried is mainly sandy. Soil above the buried objects and below it is assumed to be the same type of soil. This workwas carried out in Abeokuta, Ogun State, Nigeria. There was a remarkable phase shift which increased with burial depth. A change in burial depth from 1cm to 10 cm caused the maximum positive peak to shift from 46.50C to 38.0 °C and a change in burial depth from 40cm to 50 cm, caused the maximum peak to shift from 30.00C to 29.0 °C. The burial depth of the buried objects has effect on the amplitude of the temperature at the surface and thus its thermal signature. It was also observed that the thickness of the buried objects has a significant effect on its thermal signature. [ABSTRACT FROM AUTHOR]