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. This paper presents a methodological approach to seismic hazard assessmentbased on a hybrid source model composed of faults as independent entities andzones containing residual seismicity. The seismic potential of both types ofsources is derived from different data: for the zones, the recurrence modelis estimated from the seismic catalogue. For fault sources, it is inferred fromslip rates derived from palaeoseismicity and GNSS (Global Navigation SatelliteSystem) measurements. Distributing the seismic potential associated with each source is a keyquestion when considering hybrid zone and fault models, and this is normallyresolved using one of two possible alternatives: (1) considering acharacteristic earthquake model for the fault and assigning the remainingmagnitudes to the zone, or (2) establishing a cut-off magnitude, Mc , abovewhich the seisms are assigned to the fault and below which they areconsidered to have occurred in the zone. This paper presents anapproach to distributing seismic potential between zones and faults withoutrestricting the magnitudes for each type of source, precluding the need toestablish cut-off Mc  values beforehand. This is the essential differencebetween our approach and other approaches that have been applied previously. The proposed approach is applied in southern Spain, a region oflow-to-moderate seismicity where faults move slowly. The results obtainedare contrasted with the results of a seismic hazard method based exclusivelyon the zone model. Using the hybrid approach, acceleration values show aconcentration of expected accelerations around fault traces, which is notappreciated in the classic approach using only zones.

Approach for combining fault and area sources in seismic hazard assessment: application in south-eastern Spain