Toward the definition of a novel response spectrum for the urban environment

The earthquake motion at a given point on the surface is commonly represented by elastic response spectra. Seismic codes, however, do not distinguish between ground in county side or within an urban environment. traditional spectra are function of seismological, geological, and geotechnical parameters they based prediction free-field surface, hence, considering propagation seismic waves soil deposit neglecting presence nearby buildings. During vibrating structure emanates travelling through over large distances that modifies significantly energy resulting decrements some areas increments others. In environment, buildings generate occurrence multiple interactions generally referred to as site-city interaction. This paper presents first attempt quantify impact environment used spectrum defined free-field. A stochastic analytical model, able capture influence radiated wave field into free motion, developed determine novel for areas. proposed approach verified pertinent Monte Carlo study. Moreover, numerical model cluster analyse effect from ensemble structures surrounding soil. Comparisons conventional carried out selected locations. Remarkably, this shows limitations traditionally might lead underestimation overestimation Therefore, promising strategy predict accurately offering potential modifications current code prescriptions.