Consideration of 2018 Sunda Strait tsunami, Indonesia

On 22 December 2018, a tsunami that followed an eruption and partial collapse of the Anak Krakatau volcano in the Sunda Strait struck several coastal regions of Banten in Java and Lampung in Sumatra, Indonesia. At least 426 people were killed.

In order to know the fact-finding investigation of this tsunami, field survey, seafbed exploration and numerical calculation are carried out.

Field survey was conducted along the west coast of Java Island, the maximum runup height was around 13.0m from the ground. There were places where the momentum was stronger than the height of the tsunami and the walls were being destroyed. It indicated that in short period tsunamis, the destructive force will increase because the inundation speed is very fast. In addition, it is difficult to evacuate after seeing the tsunami because the velocity is so high.

In the seabed survey, the geology of the seabed in the shallow part around the island is examined, and the extent to which the mountain collapsed has been verified.

Finally, the numerical simulations are conducted. The parameter of the size of landslide and the density are changed to analyze the variable of tsunami height.