Deaggregation of probabilistic seismic hazard results for some selected cities in Western Mexico

ABSTRACTHere we present a deaggregation appraisal conducted for 15 selected significant cities in Western Mexico, for four oscillation periods (PGA, SA (0.2 s), SA (1.0 s), and SA (2.0 s)), also considering a different input for the soil condition (for B, B/C and C NEHRP site classes), and for two return periods (475 and 975 years). This study is based on a previous complete recently published seismic hazard evaluation for the region. An area source model consisting of thirty-seven seismic sources has been used alternatively in a logic tree with a spatially smoothed seismicity model for the same region. The obtained hazard deaggregation results prove that for most of the studied cities –those located along the Pacific coast–, nearby seismic sources are contributing most to the seismic hazard at the studied location, especially for lower periods (PGA and SA (0.2 s)). However, for a few cities far from the Middle America Trench, distant large-magnitude earthquakes contribute more to the seismic hazard, especially at larger spectral periods (SA (1.0 s) and SA (2.0 s)). Additionally, this study shows that the differences in the soil conditions for the computed return periods, have a little influence on the obtained deaggregation results.KEYWORDS: Seismic hazard deaggregationSeismic sources contributionPeak ground accelerationSpectral accelerationNational building codeMexico AcknowledgementWe extend our gratitude to the Editor-in-Chief and the anonymous reviewers for their considerate observations and priceless feedback. The first author wishes to express special appreciation to his wife "Ereny" and his sons for their unwavering encouragement and comprehension throughout the course of this research endeavor. The second author has received partial support through the Spanish project PID2022-136678NB-I00 AEI/FEDER.Disclosure statementNo potential conflict of interest was reported by the author(s).