Concept of Assessment of Tsunami Early Warning System (TEWS) and Mitigation Volcanogenic Tsunami in Sunda Strait, Indonesia
Keywords:
anak krakatau, tsunami simulation, COMCOT, early warning systemAbstract
On 22 December 2018, a flank failure during Mount Anak Krakatau (AK) volcanic eruption caused a silent tsunami disaster. Human casualties and material loss have been reported caused by this silent tsunami. This silent tsunami hindered any trigger from the existing earthquake-based tsunami early warning system (TEWS), it is due to the fact this tsunami is generated by the flank failure not an earthquake. To mitigate such disasters in the future, several research and strategies have been conducted by researchers and the government. One of the strategies is to utilize a sea level measurement instrument based on acoustics sensor called inexpensive devices for sea level monitoring (IDSL). In this research, prior to utilizing IDSL in the actual environments, assessment of IDSL algorithm sensitivity is conducted using a simulated tsunami height on several pseudo-observation points near AK. The simulation is based on 2018 AK tsunami using COMCOT model and validated with observed sea level from BIG tide stations. The results show the IDSL algorithm is capable to trigger the tsunami alert with the time lag since tsunami generation at the north of Panjang Island, north of Sertung Island, and south of Krakatau Island are 2.5 minutes, 3.5 minutes, and 2.25 minutes, respectively.
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