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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

Abstract


A fixed increment of magnitude is equivalent to multiply the seismic moment by a factor γEM related to the partial factor γq 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 γEM.

Using γEM=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 γEM at about 2.


Keywords


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

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References


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DOI: https://doi.org/10.15625/0866-7187/41/4/14233 Display counter: Abstract : 227 views. PDF : 19 views.

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