Using GPR to Monitor Cracks in a Historical Building

Abstract

The paper treats the application of GPR to detect and monitor cracks induced on a historical building by a landslide. The data were acquired on a floor inside the building with profiles 10 cm apart recorded at three different times. A 2GHz bipolar antenna was used, which allows the acquisition of multi-component data. The data were processed to produce vertical profiles and a 3D cube for each component and survey. The interpretation of the profiles is in good correlation with the structure of the floor. The profiles and time slices have detected two different kinds of anomalies, only a few of which can be due to utilities and the metallic mesh. The others were associated with cracks induced by the landslide. The time slice obtained from the last survey shows anomalies not detected before.