Estimation of Seismic Hazard in Northern Argentina, Combining Faults and Zones Hazard Estimations (PSHA). Validation of Proximity Factors to Active Faults of the Argentine Seismic Code Inpres-Cirsoc 103
Description:
The general objective of the study presented here is to characterize and estimate the seismic hazard in the northern zone of the Argentine Republic, using a methodology that combines zones and faults as seismic sources, and to analyze, in light of the results, the impact of modeling faults as independent sources in hazard assessment. The results provide criteria to validate the amplification factors due to the proximity of faults proposed by the Argentine Regulation for Seismic Resistant Constructions INPRES-CIRSOC 103 -2018 Part I, "Constructions in General”.
With this general objective, a complete seismic hazard study was carried out in zone N 3 according to the map of the INPRES building code, classified as highly hazardous zone, following a classical zoned methodology (MCZ) and another hybrid method that combines zones and faults (MH). Thus, maps of the expected motion for return periods of 475 and 975 years have been generated, as well as hazard curves and uniform hazard spectra (UHS) in the capitals of the provinces of Salta and Jujuy. The main results include: 1) considerable increase in accelerations in the fault environment when applying the MH, compared to those of MCZ; 2) The UHS spectra deduced with MH in populations close to faults are nearby to those proposed in the INPRES-CIRSOC 103-2018 regulation, which includes coefficients that modify the design spectrum according to the distance to active faults. However, those deduced in our study though MH are higher than those of the regulations for periods T < 0.5 s; remaining below for higher periods. In light of the results of this study, the spectra of the code with the modification factors proposed by closeness to fault would only be conservative for long periods, greater than 0.5 s.
Session: Opportunities and Challenges in Source Modeling for Seismic Hazard Analysis [Poster]
Type: Poster
Date: 4/20/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: María Belén Benito Oterino
Student Presenter: No
Invited Presentation:
Authors
María Belén Benito Oterino Presenting Author Corresponding Author mariabelen.benito@upm.es Universidad Politécnica de Madrid |
Luis Fernández Campos l.fernandez.campos@alumnos.upm.es Universidad Politécnica de Madrid |
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Estimation of Seismic Hazard in Northern Argentina, Combining Faults and Zones Hazard Estimations (PSHA). Validation of Proximity Factors to Active Faults of the Argentine Seismic Code Inpres-Cirsoc 103
Category
Opportunities and Challenges in Source Modeling for Seismic Hazard Analysis