Browsing by Author "Perea, Hector"
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- Characterizing active faults and associated mass transport deposits in the South Iberian Margin (Alboran Sean and Gulf of Cadiz): on-fault and off-fault paleoseismic evidencePublication . Gràcia, Eulàlia; Bartolomé, Rafale; Lo Iacono, C.; Moreno, X.; Martínez-Loriente, S.; Perea, Hector; Masana, E.; Pallàs, R.; Diez, S.; Dañobeitia, Juanjo J.; Terrinha, Pedro; Zitellini, N.During the last years we have carried out successive high-resolution marine geological and geophysical surveys to investigate the seismic potential of the slow-moving seismogenic faults from the South Iberian Margin. Based on ,ultiscale acoustic mapping, sub-seafloor seismic imaging and dating methods we have characterized submarine fault systems with unprecedented resolution. We present primary paleoseismic evidence obtained by direct investigations of selected faults from theMediterranean Sea (i.e. Carboneras Fault, Bajo Segura Fault, Adra Fault) and the external part of the Gulf of Cadiz (i.e. Marques de Pombal Fault, Horseshoe Fault, Coral Patch Ridge Fault and SWIM lineaments). The obtained fault seismic parameters suggest that these faults are active and capable of generating large magnitude (Mw > 6) seismic events, representing an earthquake and tsunami hazard for the surrounding coastal areas. Secondary paleoseismic evidence in the SW Iberian Margin (based on landslides and turbidite deposits) yields a regional recurrence rate of large magnitude earthquake of 1800 - 2000 years.
- Incorporating descriptive metadata into seismic source zone models for seismic-hazard assessment : a case study of the Azores-West Iberian RegionPublication . Vilanova, Susana P.; Nemser, Eliza S.; Besana-Ostman, Glenda M.; Bezzeghoud, Mourad; Borges, José Fernando; Silveira, António Brum da; Cabral, João; Carvalho, João; Cunha, Pedro Proença e; Dias, Ruben Pereira; Madeira, José; Lopes, Fernando Carlos; Oliveira, Carlos Sousa; Perea, Hector; García-Mayordomo, Julián; Wong, Ivan G.; Arvidsson, Ronald; Fonseca, João F. B. D.In probabilistic seismic-hazard analysis (PSHA), seismic source zone (SSZ) models are widely used to account for the contribution to the hazard from earthquakes not directly correlated with geological structures. Notwithstanding the impact of SSZ models in PSHA, the theoretical framework underlying SSZ models and the criteria used to delineate the SSZs are seldom explicitly stated and suitably documented. In this paper, we propose a methodological framework to develop and document SSZ models, which includes (1) an assessment of the appropriate scale and degree of stationarity, (2) an assessment of seismicity catalog completeness-related issues, and (3) an evaluation and credibility ranking of physical criteria used to delineate the boundaries of the SSZs. We also emphasize the need for SSZ models to be supported by a comprehensive set of metadata documenting both the unique characteristics of each SSZ and the criteria used to delineate its boundaries. This procedure ensures that the uncertainties in the model can be properly addressed in the PSHA and that the model can be easily updated whenever new data are available. The proposed methodology is illustrated using the SSZ model developed for the Azores–West Iberian region in the context of the Seismic Hazard Harmonization in Europe project (project SHARE) and some of the most relevant SSZs are discussed in detail.