GPR Prospection and Time Lapse Electrical Resistivity Tomography to Delineate Low Contrast Structures in an Archaeological Site

P073 GPR PROSPECTION AND TIME LAPSE ELECTRICAL RESISTIVITY TOMOGRAPHY TO DELINEATE LOW CONTRAST STRUCTURES IN AN ARCHAEOLOGICAL SITE 1 Introduction In the archaeological field the geophysical methods are the most suitable and economic way to a priori knowledge of the buried structures. Usually after applying some classical processing and inversion techniques geophysical data can provide useful insights to choice the points where carry on selective diggings. However in some cases it is impossible to distinguish the archaeological structures from sterile ground because of their very low electrical contrast. In the present paper an application based on georadar and ERT time