Polytechnic University of Valencia Congress, 1st Congress in Geomatics Engineering

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ANÁLISIS DE SISMICIDAD ASOCIADA AL LLENADO DE EMBALSES. CASO DEL CENTRO DE PRODUCCIÓN DE PIRRÍS (COSTA RICA)
Sandra Ruiz Barajas, Guillermo E. Alvarado, Belén Benito Oterino, Álvaro Climent

Last modified: 18-10-2017

Abstract


The presented work is the result of a new collaboration between the Costa Rican Institute of Electricity (ICE) and the Technical University of Madrid (UPM) for the investigation of induced seismicity issues. Triggered seismicity associated with the filling of artificial water reservoirs is known since six decades ago. However, it is the case of triggered seismicity more complicated to model their effects. More than 100 cases of reservoir induced/triggered seismicity have been collected around the world and this issue continues today being a research topic of great importance. Indeed, new developments and contributions are constantly being made with the aim of achieve a better understanding of their characteristics and genesis.

The main aim of the presented work is to analyze the spatial-temporal evolution of the seismic events recorded around the Pirrís reservoir before, during and after its filled. With the analysis of the seismic events we try to know and control the influence of the reservoir operations on the seismic activity of the area. Different parameters are studied, using methodologies proposed by different authors, in order to explain the possible effects of reservoir filling in changing the stress conditions in the environment and to detect any possible anomaly. Moreover, some analysis have been done in order to find a possible correlation between the water level in the reservoir and the evolution of the seismic activity recorded.

Overall, the results of this study will provide important conclusions about the sensitivity of certain parameters to evaluate and model the effects of filling reservoirs on the seismic activity in the vicinity and we will present the spatial-temporal evolution of the seismicity associated with the specific case of the Pirrís hydraulic project.

http://dx.doi.org/10.4995/CIGeo2017.2017.6666


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