Examinando por Materia "valley"

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    Ítem
    Local generation of love surface waves at the edge of a 2D alluvial valley
    (Seismological Society of America, 2018-08-01) Molina-Villegas, J.C.; Jaramillo-Fernández, J.D.; Piña-Flores, J.; Sánchez-Sesma, F.J.; Mecánica Aplicada
    This work deals with the local generation of Love surface waves at the edge of an alluvial valley that is formed by a soft layer with dipping interface. These waves are extracted from the system response due to the incidence of antiplane SH plane waves. The indirect boundary-element method (IBEM) is used for computations. Results are given as modal emission spectra of Love waves, as functions of frequency, for the fundamental mode and the first two harmonics for various combinations of incidence angles, interface geometries, and impedance ratios. The structure of these emission spectra is inspired by the analytical solution of the canonical antiplane problem of a semi-infinite layer with a moving base and wall, which allows indication of the 1D response and the locally generated surface waves. © 2018, Seismological Society of America. All rights reserved.
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    Preliminary geochemical study of thermal waters at the Puracé volcano system (South Western Colombia): An approximation for geothermal exploration
    (Universidad Industrial de Santander, 2018-01-01) Gómez-Díaz E.; Marin-Cerón M.I.; Gómez-Díaz E.; Marin-Cerón M.I.; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
    The Puracé Volcano is located in the Cauca department, SW of Colombia, along the Coconucos volcanic chain. This volcano is an interesting target for geothermal exploration, because it is a young caldera-type volcano, with thermal activity (e.g. hot springs and fumaroles). Using hydro-geochemical analyses of hot springs, we determine the type of water, origin and relation with the geothermal system, reservoir temperature, mixing process and finally the potential areas for future exploration. The analyzed water-types are bicarbonate, dilutechloride, sulphate-chloride, acid-sulphate and heated steam-acid sulfated. The conservative elements, allow to identify the correlation between different springs and to infer commune sources. Moreover, the applied solutes geothermometers for each suitable thermal-water group were used to estimate the reservoir temperature. The Silica geothermometers resulted within a range of 120°C -170°C while those the Cation geothermometers are above these temperatures reflecting values from 160°C to 220°C. However, the Cation geothermometer of low temperature clearly identify another zone of lower temperature. Mixing and recharge processes, were identified through of stable isotopes. Finally, the preliminary geothermal model shows two zones of high enthalpy system ( > 150°C). © 2018, Boletín de Geología.