Mapping Bedrock Lithology in Urban Environment via Large Scale Time Domain Induced Polarization Tomography
M. Rossi, P.I. Olsson and T. Dahlin
Event name: 23rd European Meeting of Environmental and Engineering Geophysics
Session: Geophysics for 3-D Geological Model Building
Publication date: 03 September 2017
Info: Extended abstract, PDF ( 812.34Kb )
Price: € 20
The present work is an example of a Direct-Current resistivity and time-domain Induced Polarization (DCIP) survey, carried out in an urban environment. The main goal of the survey is to map a weak zone in the bedrock, through which a tunnel will be constructed. Geophysical measurements in urban environments can be very complicated due to the restrictions of available space and the high levels of noise. A way to deal with the latter is careful processing of the recorded waveforms, if they are sampled at a reasonably high frequency (sampling >= 1 KHz). A deeper understanding of raw data leads to a more accurate use of the measured quantities, improving the reliability of electrical resistivity and IP estimations.