Time-independent and time-dependent seismic hazard in Greece based on seismogenic sources

An improved procedure is followed to assess time-independent and. time-depe ndent hazard for 144 broad sites (cities, towns, villages) of Greece in ter ms of expected macroseismic intensities at each one of these sites. III thi s procedure several new results are taken into account: source parameters b ased on new research work on seismicity and on other relative information ( new regionalization and improved seismicity data parameters and anisotropic radiation at the seismic source), a new relation for the attenuation of ma croseismic intensities, and the effect of local conditions (site effects) o n the strong-ground motion. Analytic relations and tables, determined by this procedure, permit the rel iable assessment of time-independent hazard, in terms of macroseismic inten sity (in MM scale), peak-horizontal-ground acceleration, and velocity at ea ch one of these 144 sites and at any probability level. Time-dependent hazard has been also assessed for these 144 broad sites in G reece, in terms of the probability for the occurrence of strong ground-moti on with macroseismic intensity I greater than or equal to VII (in MM scale) at each one of these sites during the period 1996-2010. Comparison of the assessed time dependent hazard with observed macroseismic intensities of th e period 1950-1995 indicates that the time-dependent model gives very reaso nable results.