Numerical modeling of seismic waves by discontinuous spectral element methods Paola F. Antonietti, Alberto Ferroni, Ilario Mazzieri, Roberto Paolucci, Alfio Quarteroni, Chiara Smerzini and Marco Stupazzini ESAIM: ProcS, 61 (2018) 1-37 Published online: 12 October 2018 DOI: 10.1051/proc/201861001