Analisis Sistem Peringatan Dini Tsunami di Zona Megathrust Selat Sunda Guna Mewujudkan Ketahanan Nasional

Earthquakes are natural phenomena that cannot be avoided, and cannot be prevented. Until now, earthquakes cannot be predicted accurately, although there have been many studies on earthquake precursors. Therefore, to reduce the risk posed by the threat of an earthquake, a fast and accurate earthquake information and tsunami early warning system is needed. The earthquake that occurred on August 2, 2019 at 19:03:21 WIB with a magnitude of 7.4 on the Richter Scale centered at sea at a direction of 147 km southwest in the Sumur area of Banten Province, and has a depth (hypocenter) of 10 km, has proven that the Sunda Strait Megathrust is an active seismic area. With the occurrence of the earthquake, the Indonesia Tsunami Early Warning System (InaTEWS) immediately responded by issuing a tsunami early warning 1 with an information delivery time of less than 4 minutes after the earthquake occurred. The tsunami early warning is declared to end (tsunami early warning 4) after 2 hours and 31 minutes from the earthquake event based on the confirmation obtained from tide gauge data located around the earthquake center. The rapid early warning information provided by InaTEWS to stakeholders and the community after the earthquake was a form of implementation of national resilience with the aim of creating a disaster-resilient society in accordance with the theory of resilient five.