206 Geophysics in Geothermal Exploration Figure 6.14 Modified after Cheng et al. (2021). (Up) Spatial relative velocity variations section. (Down) Resistivity cross-section derived from CSAMT acquisition. Many other examples of ANSI based tomography application to geothermal systems characterization can be found in the literature. Overall ANSI-based 3D Vs tomography allows a better understanding of the geological context and features, identifying faults, delineating geological layers limits and highlighting geothermal systems key characteristics. Many authors point out that seismic information provided by ANSI tomography tools is consistent with information obtained through electrical or electromagnetic surveys, hence introducing the complementary role of passive seismic methods within geothermal exploration workflows, as discussed in the following paragraph. 6.2.3 Integration into the geothermal exploration workflow Within geological exploration workflows, the role of geophysical methods is to provide data or models that inform on the subsurface response to the solicitation by a given physical field (e.g. electromagnetic, electrical, seismic, magnetic, gravimetric). Energy is propagated within the medium and the propagation modes and characteristics inform on the physical properties of the rocks associated with those physical fields (e.g. resistivity, velocity, attenuation).
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