Ground motion estimation for future earthquakes is one of the most challenging problems in seismology and earthquake engineering. This topic includes source and propagation-dominated ground motion phenomena (including energy channeling, rupture directivity, supershear), complexity in Earth structure (Regional Ground Motion Prediction Equations), nonlinearity, and site effects (basin effects, liquefaction, triggering of landslides, and topographic effects). The quantitative and reliable assessment of those phenomena is required for potential future events in a specific zone, for seismic hazard and seismic risk mitigation. This topic brings together earthquake seismologists and engineers.