Reconstructing the Anak Krakatau flank collapse that caused the December 2018 Indonesian tsunami [post]

Rebecca Williams, Pete Rowley, Matthew C. Garthwaite
2019 unpublished
Volcanogenic tsunamis are one of the deadliest volcanic phenomena. Understanding their triggering processes and mitigating their effect remains a major challenge. On 22 December 2018, flank failure of the Anak Krakatau volcano, Indonesia generated a tsunami, which killed 431 people. This event was captured in unprecedented detail by satellite imagery and eyewitness accounts. We combine historic observations with these recent data to interpret the internal architecture of Anak Krakatau, and
more » ... Krakatau, and reconstruct the failure, tsunami genesis and regrowth. The volume of material initially lost from the volcano flank was small (~0.1 km^3) but was nonetheless able to generate rapid tsunami waves with devastating impacts. Hazard assessments at ocean islands must consider that even small flank collapses, during unexceptional eruptions, can have catastrophic consequences.
doi:10.31223/ fatcat:oa4bh52b5ncdvp7xwgqk5dtmwa