This book allows scientists to understand the physical behaviour of the Earth, specific concepts and techniques developed in the twentieth century to study the environment in order to protect people and exploit the natural resources found in this environment. Among the techniques used to probe the Earth, some may be particularly effective for studying a subsurface site. We will distinguish for example :Seismic methods (seismic reflection and refraction, seismic noise mapping)Geodetic methods (deformation measurements)Gravimetric methodsMagnetic and electrical methods (mapping, soundings and electric tomography)Electromagnetic and georadar methods with their variants in drilling, to which must be added methods specific to hydrogeology.These techniques have acquired a very high level of technicality and their study can take decades.Above all, geophysics provides a set of concepts and knowledge obtained about the Earth, many of which are fundamental to the understanding of small and medium-scale natural systems.
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