Seismic hazard and IM distribution Sample Clauses

Seismic hazard and IM distribution. ‌ The earthquake damage accumulation process requires the distribution of earthquake intensity given the occurrence of a seismic shock. This means to carry PSHA for the site of the construction. The chosen ground motion intensity measure is the spectral acceleration at the elastic period of the two systems, Sa (T = 0.5s) , which is the same for both (to follow). Both systems are supposed located in Sulmona (close to L’Aquila, in central Italy). PSHA for this site (Figure 7, left) was carried out via the FORTRAN code also used in [19]. In the software, seismogenic source zones of Italy are those of [20], while seismic parameters of each zone are those from [21,22]. The adopted GMPE is that of [23]. It was assumed that the coordinates of the epicenter are uniformly distributed over each source zone. Because of distance applicability limits of the GMPE, contributions distant more than 200 km from the site were neglected in hazard computations. Figure 7 (left) shows the source zones considered, while Figure 7 (right) provides the resulting distribution of intensity at the site given the occurrence of an earthquake. Further details about PSHA for the site and a summary of the source zone parameters may be found in [19]. However, a relevant information for this study is that the rate of occurrence of earthquakes within the magnitude bounds of the considered seismic sources, and then at the site, is ν E = 1.95 [events / year]. This annual rate times the curve in Figure 7 (right) provides the annual rate of exceedance of IM at the site; i.e., the hazard curve; see Equation (6).
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