THE tsunami in the Sunda Strait on December 22, 2018, made some people think of Widjo Kongko. The tsunami researcher at the Agency for the Assessment and Application of Technology (BPPT) presented his study on potential tsunamis in the western parts of Java in a seminar organized by the Meteorological, Climatological and Geophysical Agency, BMKG, on April 3 in Jakarta. His analysis showed, in case a megathrust happened—whereby two plates co