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Jakarta, CNBC Indonesia– BMKG Director Dwikorita Karnawati said that the investigation and early warning system were not enough to truly protect the community from the threat of a potential 20-meter tsunami in the south of the island of Java. There must still be the willingness of the community and local government to respond to this Early Warning quickly and accurately, including when preparing evacuation facilities and infrastructure.
“Also, the public should continue to be educated to be more aware of the dangers of the earthquake and tsunami in their area,” Dwikorita said when contacted by CNBC Indonesia on Friday (09/25/2020).
Dwikorita also explained that the research conducted was a multidisciplinary data, knowledge and interagency study to assess the potential for earthquakes to occur in the seismic gap zone at the source of the Megathrust South Java earthquake. Besides that, it also models the impact of the Megathrust earthquake in the form of the height of the tsunami waves on the southern coast of Java.
“So the area of the seismic gap in the Megathrust earthquake source zone is used as input in tsunami modeling using various scenarios; scenario 1 if only the southern Megathrust segment of West Java is broken,” he said.
Scenario 2 if only the southern segment of East Java’s Megathrust breaks, then the worst-case scenario if these two segments split together can yield a Mw magnitude of 9.1. Based on this model, it can trigger a tsunami with a maximum height of 20 meters in the southern part of West Java (more precisely in southern Banten) and 12 meters in southern East Java, with an average tsunami height of 4 ,5 meters.
“According to the results of the investigation, the arrival time of the tsunami waves was about 20 minutes,” he said.
Dwikorita also said that Indonesia’s readiness to face this potential in 2008, BMKG had operated a Tsunami Early Warning and Monitoring System to anticipate the impact of the Megathrust earthquake that had occurred in Aceh. At that time, the arrival time of the tsunami waves at the nearest beach was approximately 20 minutes.
“The built system is operated by using the Internet of Things (IoT) and artificial intelligence (AI) to quickly calculate earthquake parameters, magnitudes, and earthquake hypocenter locations, which can then be automatically calculated with mathematical models ( estimate) potential tsunami events. “Dwikorita said.
In this way, the information on earthquake events and tsunami early warning can be automatically disseminated via BNPB, BPBD, television and other information dissemination modes, SMS, telephone or fax, social media, BMKG information applications. So within 3-5 minutes after the earthquake occurred.
“This means there are still 15 to 17 minutes left before the estimated arrival of a tsunami wave for evacuation,” he said.
