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Jakarta, CNBC Indonesia – The island of Java is reported to have the potential to be hit by a tsunami of up to 20 meters in the south of the island of Java. In fact, it is estimated that giant ocean waves only take 20 minutes to reach shore.
This was stated by the Head of the Center for Earthquakes and Tsunamis of the Meteorology, Climatology and Geophysics Agency, Rahmat Triyono, when it was confirmed, quoted by detik.com, on Friday (9/25/2020).
“According to the results of our modeling, in southern Java, the tsunami hit the mainland for only about 20 minutes,” Rahmat said.
In southern Java, there is the Sunda Megathrust Line, which is a subduction zone between the India-Australia plate and the Eurasian plate. Sunda Megathrust stretches from the west coast of Sumatra to the Nusa Tenggara Islands.
The distance between Java and Sumatra island to the megatrhust route is about 200-250 km. From that route, a large earthquake can occur that can trigger a large tsunami.
If a large earthquake with a magnitude (M) of 9.1 occurs in the mega-thrust zone, 20 minutes later the tsunami waves will reach the shore. The people of the continent will not have much time to save themselves.
People in coastal areas are advised not to expect a tsunami watch from the BMKG. Anyway, just run to a safe place.
“If you live near the coast, if you feel a strong shock, yes, you don’t need to wait for a warning, because a tsunami is likely to happen soon. Once there is a shock, run. If you wait for a warning, that means you’ve lost. weather”. Rahmat said.
The Tsunami Early Warning System (InaTEWS / Indonesia Tsunami Early Warning System) will be tested on October 6, via the Indian Ocean Wave Exercise 20 (IOWave20) on October 6. The event was a simulation of a magnitude 9.1 (M) earthquake and the response of the InaTEWS system. Many countries potentially affected by the tsunami will participate.
“However, the better the early warning, the better the public awareness to respond immediately, conduct an independent evacuation,” he said.
Previously, the Bandung Institute of Technology (ITB) presented the results of their research. Tsunamis are believed to occur along the southern coast of West Java to East Java. This research also uses data from BMKG and GPS.
ITB researcher Sri Widiyantoro explained that the tsunami could reach 20 meters on the southern coast of West Java and 12 meters in southern East Java, with an average maximum height of 4.5 meters along the coast. South Java if they occur simultaneously.
Based on disaster scenario modeling developed by ITB scientists, a large tsunami occurs when segments of the mega thrust across Java simultaneously break apart.
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