Tsunami Impact on Nearby Unpopulated Islands

Maximum near-field wave height in first 410 seconds, as modelled by Grilli et al. (2020).

The largest near-field impacts of the tsunami were fortunately confined to the unpopulated islands around the old caldera, particularly the sides of Rakata and Sertung that directly face the southwest flank of Anak Krakatau 2-4 km away. An international post-tsunami survey team found the tsunami had scoured all vegetation from those shores up to a maximum elevation of 85 m on Rakata and 83 m on Sertung; the average trim line elevation is more in line with the Giachetti model predictions of approximately 30 m (Borrero et al., Paris et al.).

Sunda Straits region. Krakatau islands are in the central box.
Tide stations are indicated with black triangles. (From Omira & Ramalho 2020)

Contents

• History
• Post-tsunami Eruptions and Cone Regrowth
• 22 December 2018 Eruptions and Tsunami
• Tsunami Impact on Nearby Unpopulated Islands
• Tsunami Impact on Populated Coastlines of Sumatra and Java
• Tsunamagenic Flank Failure Scenarios
• Seismic Signals, Early Warning Wystems and Event Documentation
• Lessons Learned
• Event Information
• Krakatau Islands History
• Media Reports, Photos and Video
• Research Articles