Browsing by Author "Becerra Carreño, Valeria Camila"

Now showing 1 - 1 of 1
  • Thumbnail Image
    Item
    Analysis of seismic coupling in rupture zones of the andean subduction margin and its relationship with the seismo-tectonic context
    (2025) Becerra Carreño, Valeria Camila; Crempien de la Carrera, Jorge; Yáñez Carrizo, Gonzalo Alejandro; Pontificia Universidad Católica de Chile. Escuela de Ingeniería
    In Chile, a highly seismic country, it is essential to understand the processes that generate earthquakes due to their impact to society. To achieve this, co-seismic slip and interseismic coupling models are commonly analyzed using instrumental observations such as seismometers and GPS receivers. Due to the distance and distribution between the seismic source and the data, inversion methods are used to estimate models consistent with fault mechanics. The seismic potential of the region is assessed using multiple simultaneous approaches such as the coupling analysis on the main fault. This work proposes to integrate seismic cycle knowledge and geodetic data into an advanced inversion methodology to improve seismic coupling estimation and better characterize earthquake hazards in regions of interest. We use an approach based on the analysis of both slip deficit and accumulated energy at the plate interface, which are directly related to the physics of rupture processes. A Bayesian inversion method is developed which incorporates spatial correlations of kinematic (backslip) and mechanical coupling models (stress rates) and the quantification of uncertainties. Both methods are validated with synthetic tests and applied to two regions of Chile: the central zone, characterized by the 2010 Mw 8.8 Maule and 2015 Mw 8.4 Illapel earthquakes, and the north-central zone, a high-potential seismic gap. The models obtained show strong correlations with seismic and gravity anomaly observations, allowing a better understanding of the relationship between subduction processes and earthquake generation. These results are essential to understand potential seismictectonic segmentation and for estimating the seismic and tsunamigenic risk in the Andean region.