Identifying the cause of past tsunamis is of paramount importance to mitigate the risk connected with future events, but recognizing a landslide-tsunami when the mass failure is entirely submarine is very challenging because of the paucity of detectable evidence (e.g., Lynett et al. 1998; Tappin et al. 2001; Synolakis et al. 2002; Fritz et al. 2007). Efforts in this direction are, however, necessary because the arrival time of these tsunamis to the coast is commonly very short (i.e., they usually originate along the margin of the continental shelf) and the related runup...

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