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Increasing human activities along the coasts of the world provoke thenecessity to assess tsunami hazard from different sources (earthquakes,landslides, volcanic activity). In this paper, we simulate tsunamis generatedby underwater volcanic explosions from (1) a submerged vent in a shallowwater lake (Karymskoye Lake, Kamchatka), and (2) from Kolumbo submarinevolcano (7 km NE of Santorini, Aegean Sea, Greece). The 1996 tsunami inKarymskoye lake is a well-documented example and thus serves as a case studyfor validating the calculations. The numerical model reproduces realisticallythe tsunami run-ups measured onshore. Systematic numerical study of tsunamisgenerated by explosions of the Kolumbo volcano is then conducted for a widerange of energies. Results show that in case of reawakening, the Kolumbovolcano might represent a significant tsunami hazard for the northern,eastern and southern coasts of Santorini, even for small-power explosions

natural hazards and earth system sciences

Numerical simulations of tsunamis generated by underwater volcanic explosions at Karymskoye lake (Kamchatka, Russia) and Kolumbo volcano (Aegean Sea, Greece)