Determinación del grado de actividad de fallas extensivas en zonas de deformación lenta y su influencia en los estudios de peligrosidad sísmica

Resumen

An approach to the classification of active faults in low-active intraplate extensional regions is proposed. It implies the correlation of individual faults with the present and historical seismicity, and the use o f geological, geomorphological and paleoseismological data to determine the faults that could be seismogenic although have not caused large earthquakes in historical and instrumental periods. These faults are classified as seismogenic faults, high potential faults and mid potential faults. Finally, the inclusion of the fault parameters of faults defined as seismogenic or high potential in seismic hazard studies shows the importance of studying potential active faults in low seismic zones. The northwestern margin of the València trough was taken as a case study. Among the extensional faults of this region, two of them have been classified as seismogenic, 15 as high potential and 22 as mid potential. The seismic hazard analysis done in the València trough shows that the combination of the probabilistic method with the characteristic earthquake method, that includes the parameters of seismogenic and high potential faults, increases the hazard in zones where using only the probabilistic method the hazard was lower.