201 QUAL I TÉ GÉOPHYSIQUEAPPLIQUÉE Synthesis 10 J.-L. Mari, M. Mendes, H. Chauris The 7 chapters in this book provide a practical overview of seismic imaging: Chapter 1 is a brief review of the current state of knowledge in seismic propagation. It introduces the different seismic methods for prospection. Several examples are used to show the different waves, which can be observed on field records and are predicted by the wave equation. The chapter underlines the fact that the acquisition geometry (2D or 3D) and the type of seismic survey (surface or well) must be taken into consideration in the wave identification. Chapter 2 is dedicated to refraction surveying. Seismic refraction can be used for investigations at all depths, but for various technical reasons it is mostly used in the study of the first 300 metres of the subsurface (spread length, importance of the source energy, …). Refracted P-waves are currently used to obtain a velocity model of the near surface by combining conventional methods such as the T plus – T minus or GRM method and tomography. The refraction method is currently used in hydrogeology and in civil engineering. We have presented 2 applications of the refraction method: the computation of static corrections, and the characterization of a near-surface karstic reservoir. This chapter of Seismic Imaging: a practical approach is published under Open Source Creative Commons License CC-BY-NC-ND allowing non-commercial use, distribution, reproduction of the text, via any medium, provided the source is cited. © EDP Sciences, 2019 DOI: 10.1051/978-2-7598-2351-2.c010
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