Justin McCurry; Frances Perraudin; agencies (2018 թ․ դեկտեմբերի 23). «Sunda Strait tsunami death toll likely to rise, say Indonesian officials». The Guardian. Վերցված է 2018 թ․ դեկտեմբերի 23-ին. «The tsunami is believed to have been caused by the collapse of Anak Krakatau that followed an eruption of the Anak Krakatau volcano. There were no significant seismic tremors to indicate a tsunami was coming.»
