摘要：AbstractIn this work, we develop a multidisciplinary approach to investigate a geothermal system located at the volcanic arc of a subduction-related orogen and highlight the interplay between active tectonism, stress field and fluid migration. By using results of field investigations from the Tinguiririca geothermal field in the High Andes of Chile (35°S), empirical analysis, and numerical models of static stress variations, we proposed a geomechanical model for evaluating the distribution of hydrothermal manifestations in a seismically-active region. The present geomechanical model follows four major steps: (1) development of the 3D structural model of fault pattern; (2) estimation of thein-situstress field; (3) calculation of the resolved-shear-to-normal-stress ratio (slip tendency) on each fault with varying geomechanical parameters (coefficient of friction, pore pressure and cohesion) as inputs; and (4) estimation of Coulomb static stress changes as a consequence of failure in a nearby fault. Through combination of all these analyses, we characterize in detail both the active deformation in the geothermal field and its relationship with hot fluid migration.Graphical abstractDisplay OmittedHighlights•We propose a geomechanical model for the Tinguiririca geothermal field (Andes 35°S).•Characterization of the active deformation and its relationship with fluid migration.•Seismological behaviour of the geothermal system.•Fault stress state, Coulomb stress change by local seismicity and fluid migration.
关键词：KeywordsenSouthern central AndesPaleostress analysisFluid migrationCoulomb static stress change
