Task 2 (WG-T2): Ground motion simulation

(Maria D’Amico, Mara Monica Tiberti, Emiliano Russo, Antonio Gomez-Capera)

The prerogative of the WG-T2 will be to perform deterministic shaking scenarios at selected sites in order to produce a flatfile of synthetic ground motion parameters and related metadata. The main use of the numerical simulations of the ground motion is to constrain the scaling of the low frequency behavior for seismic events not represented in the database (e.g. large magnitude in near source).

The WG-T2 is responsible for selecting the more appropriated methods for the numerical simulation of the ground motion (Boore, 2003; Pacor et al. 2005; Gallovic and Brokesova, 2007 among others) and for developing the validations requirements (Seismological Research Letters, Vol. 86, n°1, 2015). In this framework, we will also use fault geometry derived from macroseismic intensity field of past strong earthquakes, not included in seismogenic fault databases (DISS3.1.1). It will imply the validation of ad hoc relationships between GMP and Intensity Points (IP).

The WG-T2 is also responsible to:

• Define the inputs for finite-fault simulations (DISS3.1.1 or Macroseimic Intensity Field of historical earthquakes).

• Select models for the kinematic inputs (nucleation points, rupture velocity, slip distribution).

• Associate the more appropriate path parameters (Q, geometrical spreading).

• Select representative 1D crustal velocity structure.