NEW SEISMICITY BASED SEISMIC SOURCES AND HAZARD MODEL FOR PERU

Aguilar Z.; Tarazona J. · World Conference on Earthquake Engineering proceedings (2024)

Resumen

In seismic design, intensity parameters are used to represent the seismic demand; however, in regions with limited information, the selection of these parameters may be controversial. Likewise, a probabilistic seismic hazard assessment is used to evaluate this demand. In Peru, the selection of seismogenic sources and their maximum seismic magnitudes to evaluate the regional seismic hazard has been a challenge due to the limited information available on significant events and subjective decisions in the zoning of seismic sources. In this study, a seismic zonation of Peru has been performed using several approaches based on seismicity and geology. The seismic catalog was updated to the year 2022, generating 34 seismic sources (7 interface, 15 intraplate and 12 crustal) with their corresponding maximum magnitudes. These maximum magnitudes are in the range of Mw 8.7-9.0 for interface sources and Mw 7.7-8.0 for intraplate sources. Furthermore, seismic hazard maps for return periods of 475 and 2475 years have been generated based on these models, from which it is possible to appreciate consistency in their boundaries with studies of neighboring countries, which represents a good step to follow in the updating of seismic design maps in Peru.

Instituciones: Universidad Nacional de Ingeniería