Experts Say The Impact of Mount Anak Krakatau’s Eruption Potentially Cause a Tsunami, Here’s Mitigation Efforts

KOMPAS.com – Experts from the National Research and Innovation Agency (BRIN), said that there was a potential for a tsunami as a result of the eruption of Mount Anak Krakatau (GAK). Therefore, the public is asked to be aware of the threat from these natural disasters.

Head of the Hydrodynamic Technology Research Center (PRTH) – BRIN, Widjo Kongko said based on data and observations from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) – Geological Agency, there was an increase in the activity of Mount Anak Krakatau from alert level 2 to alert level 3.

“This shows the potential for an eruption (Mount Anak Krakatau) and can potentially cause a tsunami,” said Widjo as quoted from the official BRIN website, Wednesday (11/5/2022).

Regarding the estimation of the magnitude of the impact of the tsunami, Widjo said that this depends on the trigger of the source, namely how large the eruptive activity of Mount Anak Krakatau is. In addition, depending on the volume of the caldera avalanche or the lava it spewed out.

“The results of the tsunami modeling study that have been carried out for the eruption at the end of 2018 can be used as a reference for potential tsunamis in the future if there is a GAK eruption, especially to predict the arrival time of the tsunami on the coast and the estimated height,” he added.

Also read: Update on Mount Anak Krakatau’s Eruption Declines, BMKG: Small Tsunami Potential

Regarding the possible impact of a tsunami that could potentially occur due to this volcanic eruption, until now, the Meteorology, Climatology and Geophysics Agency (BMKG) and the Geological Agency PVMBG continue to monitor the development of Mount Anak Krakatau’s activity and sea level in the Sunda Strait.

The tsunami expert, who is a member of the Indonesian Tsunami Experts Association (IATSI), explained that so far the government has made efforts to create a tsunami mitigation program from upstream to downstream.

For example, at the upstream level there is an early warning system in case of a tsunami, and dissemination to improve community preparedness.

Furthermore, at the downstream level, his party has prepared evacuation routes and shelters or evacuation sites along with evacuation planning guidelines.

Even so, in mitigating the potential for a tsunami from the eruption of Mount Anak Krakatau, tsunami victims still exist, such as the impact of this volcanic eruption that occurred in the Sunda Strait at the end of 2018.

Read also: Mount Anak Krakatau Erupts, BMKG: Beware of Potential Tsunamis

KOMPAS.COM/RASYID RIDHO The status of Mount Anak Krakatau has risen to Alert

This condition, said Widjo, indicates that the existing program is not sufficient so that it needs to be improved again.

“I think the public also needs to get detailed information related to the potential tsunami threat in the location where they live and of course other information related to evacuation routes and temporary evacuation sites,” he said.

Meanwhile, BRIN researcher and tsunami expert at IATSI, Semeidi Husrin said that currently the strengthening of the tsunami early detection system in the Sunda Strait has been carried out. The government has installed an Inexpensive Device for Sea Level measurement (IDSL) in the Mount Anak Krakatau complex.

“The IDSL tool or in Indonesian called PUMMA (Cheap Measuring Device for Sea Level) is the result of joint research from (at that time) KKP, LIPI, UNILA and JRC-EC International Partners which were installed in the Sunda Strait, shortly after the tsunami incident last year. 2018,” explained Semeidi.

PUMMA equipment is still installed on Sebesi Island, Lampung and Marina Jambu, Pandeglang. Semeidi said that although the tool is far from the Mount Anak Krakatau complex, the results given have looked very good in the last three years.

The results of PUMMA’s performance can be seen from various parameters such as tight data quality, fast (real-time) transmission, being able to provide alerts if there is a water level anomaly (tsunami), and equipped with CCTV cameras for visual confirmation.

Read also: Mount Anak Krakatau is on alert Level 3, this is a list of the status of volcanoes in Indonesia

In the process of installing IDSL or PUMMA at the GAK complex, BRIN and BMKG collaborated with several parties including KKP, UNILA, BAKTI Kominfo, Telkomsel, Balawista and others.

BAKTI Kominfo has completed the mockup of the satellite telecommunications system for Krakatoa on Rakata Island. Meanwhile, Telkomsel has built a GSM tower in Sebesi so that Setung and Panjang islands are covered by GSM.

“With the support of telecommunication infrastructure and related infrastructure from PT. Telkomsel and BAKTI Kominfo coordinated by BMKG, this system will soon be realized and will assist BMKG in detecting high waves due to the activity of Mount Anak Krakatau,” said Semeidi.

The public is also advised to increase awareness of the potential for high waves or tsunamis, especially at night.

He asked the public to remain calm, and not be influenced by irresponsible issues. Make sure the information only comes from the local Geological Agency, BMKG, and BPBD (Regional Disaster Management Agency).

Also read: The status of Mount Anak Krakatau has risen to Level 3 Alert, this is a potential danger

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