Claros Gómez, Diego F.

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    Ground motion prediction equations for Puerto Rico
    (2022-05-10) Claros Gómez, Diego F.; Vanacore, Elizabeth A.; College of Engineering; Martínez Cruzado, José A.; Suárez, Luis E.; Ramos-Cabeza, Ricardo; Department of Civil Engineering; Huérfano Moreno, Víctor A.
    The main objective of seismic engineering is to reduce the uncertainty regarding the impact of earthquakes on structures (Baker, 2008). Seismic hazard analysis is one of the main tools that allow establishing a quantitative estimate of the seismic hazard, which requires the Ground Motion Prediction Equation (GMPE), to estimate the level of ground shaking (Kramer, 1996 and Reiter, 1990). Most seismic databases are relatively recent compared to the times involved in tectonic processes. For this reason, it is appropriate to update the Ground Motion Models (GMM) to the extent that relevant information associated with these processes is available. The last seismic hazard study was conducted in 2003 for Puerto Rico (Mueller et al. 2003), which included a specific relationship for the Caribbean developed under a stochastic finite failure approach, i.e., the data were not directly used to obtain ground motion ratios (Motazedian and Atkinson, 2005). This study presents the results of a crustal and non-crustal GMPE obtained empirically by regression (the first of this class at the local level), which compiles the seismic information of the last 20 years. Once the parameters for the unification of magnitudes and soil classification were established, two regression matrices were consolidated with 2805 records for the crustal model and 3449 records for the non-crustal model. From a regression analysis in three methodologies, the best fit models were found with an average coefficient of determination of 0.90 for crustal GMPE and 0.62 for non-crustal GMPE, for Intensity Measures (IM) PGA, PGV, and 21 periods of PSA