Seismogenic nodes as a viable alternative to seismogenic zones and observed seismicity for the definition of seismic hazard at regional scale

Paolo Rugarli; Franco Vaccari; Giuliano Panza

doi:10.15625/0866-7187/41/4/14233

Author affiliations

Authors

Paolo Rugarli CASTALIA S.r.l., Via Pinturicchio, 24, 20133, Milano, Italy
Franco Vaccari Univ. di Trieste, Dip. di Matematica e Geoscienze, Trieste, Italy
Giuliano Panza 1. Accademia Nazionale dei Lincei, Roma, Italy 2. Earthquake Administration, Beijing, China 3. International Seismic Safety Organization (ISSO), Arsita, Italy 5. Beijing University of Civil Engineering and Architecture (BUCEA)

DOI:

https://doi.org/10.15625/0866-7187/41/4/14233

Keywords:

Seismogenic nodes, Seismogenic zones, Maximum Credible Earthquake, Neo Deterministic Seismic Hazard Assessment, Eurocodes

Abstract

A fixed increment of magnitude is equivalent to multiply the seismic moment by a factor γ_EM related to the partial factor γ_q acting on the seismic moment representing the fault. A comparison is made between the hazard maps obtained with the Neo-Deterministic Seismic Hazard Assessment (NDSHA), using two different approaches: one based on the events magnitude, listed in parametric earthquake catalogues compiled for the study areas, with sources located within the seismogenic zones; the other uses the seismogenic nodes identified by means of pattern recognition techniques applied to morphostructural zonation (MSZ), and increases the reference magnitude by a constant amount tuned by the safety factor γ_EM.

Using γ_EM=2.0, in most of the territory the two approaches produce totally independent, comparable hazard maps, based on the quite long Italian catalogue. This represents a validation of the seismogenic nodes method and a tuning of the safety factor γ_EM at about 2.

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