Seismic hazard assessment can be performed following a neo-deterministic approach (NDSHA),
which allows to give a realistic description of the seismic ground motion due to an earthquake of
given distance and magnitude. The approach is based on modelling techniques that have been
developed from a detailed knowledge of both the seismic source process and the propagation
of seismic waves. This permits us to define a set of earthquake scenarios and to simulate
the associated synthetic signals without having to wait for a strong event to occur. NDSHA
can be applied at the regional scale, computing seismograms at the nodes of a grid with the
desired spacing, or at the local scale, taking into account the source characteristics, the path and
local geological and geotechnical conditions. Synthetic signals can be used as seismic input
in subsequent engineering analyses aimed at the computation of the full non-linear seismic
response of the structure or simply the earthquake damaging potential. The same approach can
be applied to tsunami hazard assesment: for a specific coastal area one has to characterize the
seismic sources and select the earthquake scenarios that can drive the hazard; afterward the
associated synthetic tsunamigrams are computed using the modal method. Massive parametric
tests, to explore the influence not only of deterministic source parameters and structural models
but also of random properties of the same source model, enable realistic estimate of seismic
hazard and their uncertainty. The use of the EU-India Grid infrastructure allows to conduct
massive parametric tests for evaluating the uncertainties in the computed hazard maps. In
the framework of cooperation project between three Italian partners (DMG, University of
Trieste; ICTP SAND Group; CNR/IOM uos Democritos) and two Indian partners (ISR, Gujarat;
CSIR C-MMACS, Bangalore) a system will be set up for the scenario-based characterization of
the seismic and tsunami hazard, integrated with the e-infrastructures of the project EU-India Grid.
