megathrust

Headline:
Indonesia Braces for Potential Megathrust Earthquake and Tsunami: BRIN Urges Mitigation Measures

Article:

Jakarta, CNBC Indonesia – Scientists from the Center for Geological Hazard Research at the National Research and Innovation Agency (BRIN), Nuraini Rahma Hanifa, are warning the public to be vigilant about potential disasters that could strike at any time. Rahma emphasized the risk of megathrust earthquakes in southern Java, which could generate tsunamis similar to the one experienced in Aceh.

The scientist stressed that this threat should be taken seriously by stakeholders and the public to mitigate the impact of potential disasters. Rahma’s research indicates that the megathrust segment in southern Java, including the Sunda Strait, has significant tectonic energy and the potential to cause earthquakes with magnitudes ranging from 8.7 to 9.1.

"If this megathrust occurs, it could trigger intense shaking and a tsunami that could reach Jakarta in approximately 2.5 hours," Rahma explained, according to a BRIN website statement on Friday (9/1/2025).

Simulations suggest that if a tsunami were to occur, wave heights could reach up to 20 meters along the southern coast of Java, 3-15 meters in the Sunda Strait, and around 1.8 meters along the northern coast of Jakarta. previous historical events like the 2006 Pangandaran tsunami, triggered by a marine landslide near Nusa Kambangan.

"The energy stored in the southern Java subduction zone continues to increase over time. If released suddenly, it could cause widespread damage from a high tsunami, not only in southern Java but also in other coastal areas," Rahma added.

[[[[Image Caption: Illustration of the Sunda Strait. (Dok. BMKG)]

BRIN emphasizes the importance of mitigation through structural and non-structural approaches. Structural measures include building tsunami barriers, wave breakers, and planning coastal areas with a safety buffer of at least 250 meters from the shoreline. Natural solutions like mangrove forests and other coastal vegetation can also help absorb tsunami energy.

Non-structural measures involve educating the public about disaster mitigation, conducting evacuation drills, and ensuring adequate evacuation routes and shelters.

"It’s crucial for communities to understand tsunami risks, have effective early warning systems, and be able to respond quickly," Rahma said.

In urban areas like Jakarta, where population density is high and soil is prone to amplifying shaking, mitigation efforts also include retrofitting or strengthening building structures.

"Retrofitting is crucial, especially for buildings in highly populated areas, as intense shaking could cause massive damage and loss of life," Rahma added.

For industrial areas like Cilegon, secondary hazards such as fires caused by fuel or chemical leaks in large factories also pose a threat and require strict safety standards.

Rahma noted that based on paleotsunami research, megathrust earthquakes in southern Java have a recurrence period of approximately 400-600 years. The last known event was in 1699, which means that the energy stored is now at a critical level.

"Disasters like the Aceh tsunami teach us that preparedness and disaster mitigation are key to saving lives," Rahma proclaimed.

To implement disaster preparedness, BRIN continues to collaborate with the Ministry of Maritime Affairs and Fisheries (KKP), the Indonesian Meteorological, Geophysical, and Climatological Agency (BMKG), and other related institutions to strengthen Tsunami Early Warning Systems, especially in the Sunda Strait and southern Java regions.

Rahma believes that the 20th anniversary of the Aceh tsunami serves as a momentum to raise awareness about similar potential disasters in the future, and with the support of research and technology, disasters can be managed more systematically and effectively.

With comprehensive mitigation efforts, Indonesia aims to minimize damage and losses from potential megathrust earthquakes and tsunamis in the future.

"We can’t predict when an earthquake will happen, but we can prepare. Adaptation, education, and collaboration are key to reducing disaster risks," Rahma concluded.

_source: CNBC Indonesia

Headline:
Indonesia Braces for Megathrust Earthquake: potentially Catastrophic Tsunami Looms

Byline:
CNBC Indonesia — Jakarta

Body:

Indonesia faces a significant and growing threat from megathrust earthquakes, with potential epicenters located in the Sunda Strait, southern coastline of Java, and the Mentawai-Siberut region. Research from the Geological Disaster Prevention Research Center at the National Research and Innovation Agency (BRIN) reveals that megathrust quakes in southern Java recur every 400 to 600 years, and the last one occurred in 1699. Today, tectonic stress has accumulated to critical levels.

Dr. Nuraini Rahma Hanifa, a researcher at BRIN, warns that a megathrust earthquake in the southern Java region could trigger a tsunami as devastating as the one that struck Aceh in 2004. She urges serious attention from stakeholders and the public to mitigate risks. Rahma’s research indicates that the megathrust segment in southern Java, including the Sunda Strait, harbors significant tectonic energy, capable of generating an earthquake with a magnitude of up to 9.1.

"If such an earthquake were to occur, it could generate substantial seismic shaking and tsunami waves that would travel through the Sunda Strait and reach Jakarta in approximately 2.5 hours," Rahma said. Simulations involving BRIN and other research institutions suggest that tsunami waves could reach heights of up to 20 meters along southern Java’s coast, 3 to 15 meters in the Sunda Strait, and around 1.8 meters along Jakarta’s northern coast.

Dr. Rahma further emphasized that the energy stored in the subduction zone continues to increase over time and could unleash a massive tsunami that would not only impact southern Java but also other coastal regions.

To mitigate the risks, BRIN advocates a two-pronged approach: structural and non-structural measures. Structural measures include building tsunami barriers and wave.Prevention structures, and planning coastal development while maintaining a 250-meter safety zone from the shoreline. Additionally, preserving coastal ecosystems, such as mangroves and seagrass beds, can help absorb tsunami energy. Non-structural measures involve public education, evacuation drills, and ensuring adequate evacuation routes and shelters.

In densely populated urban areas like Jakarta, earthquake-proofing buildings through retrofitting is also crucial. For industrial zones like Cilegon, anticipating secondary hazards such as fires caused by fuel or chemical leaks is necessary.

BRIN emphasizes the importance of preparedness and mitigation to save lives, as demonstrated by lessons learned from the Aceh tsunami.

Image Caption:
Potential scenarios of a megathrust earthquake and subsequent tsunami in the southern Java region. (Image: Nature.com)

Read More:
Megathrust Earthquakes: Indonesia awaits looming threat [Link to previous article]

Video:
Saksikan video di bawah ini: Video: Menko Zulhas Singgung Ketidakberpihakan BRIN Soal Inovasi Bibit

Headline:
High Alert: Megathrust Threat Looms Large for Jakarta

Subhead:
Study warns of massive earthquake and tsunami potential in Java’s southern region, posing significant risk to the Indonesian capital.

Article:

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CNBC Indonesia, 01/04/2024

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Megathrust, the most powerful type of earthquake, poses a real threat to Jakarta. This is due to one of the locations of the megathrust zone, the Sunda Strait, being extremely close to the capital.

Key Takeaways:

• Megathrust earthquakes pose a significant threat to Jakarta.
• The Sunda Strait, near Jakarta, is a prime location for these earth-shattering events.
• An earthquake in this region could trigger a tsunami, with waves reaching Jakarta in about 2.5 hours.
• The potential height of tsunami waves is estimated between 20 meters in southern Java, 3-15 meters in the Sunda Strait, and 1.8 meters in Jakarta’s northern coast.
• Mitigation strategies, both structural and non-structural, are crucial to minimize the impact of such disasters.

In an alarming revelation, Nuraini Rahma Hanifa, a researcher from the Center for Geological Disaster Research at the Indonesian Institute of Sciences (BRIN), has highlighted the threat of a megathrust earthquake in southern Java. Such an event could generate a tsunami similar to the one that devastated Aceh in 2004.

According to Rahma, the megathrust segment in southern Java, inclusive of the Sunda Strait, harbors substantial tectonic energy, capable of triggering earthquakes measuring up to 9.1 on the Richter scale. Thiscould lead to intense shaking and a tsunami that could ripple through the Sunda Strait and reach Jakarta in approximately 2.5 hours.

Historical evidence, such as the 2006 Pangandaran tsunami, which was caused by a marine landslide near the Nusa Kambangan island, supports these findings. Moreover, research suggests that the energy building up in this zone has been accumulating for centuries, and the last major event occurred in 1699. Given the 400-600 year cycle, the region is long overdue for another cataclysmic earthquake.

To mitigate these dangers, BRIN emphasizes the importance of both structural and non-structural measures. Structural mitigation includes building tsunami barriers, wave breakers, and ordering the evacuation of coastal areas within a safe distance (at least 250 meters from the shore). Non-structural mitigation involves public education, tsunami drills, and identifying safe evacuation routes and locations.

For densely populated urban areas like Jakarta, building retrofitting is also crucial to strengthen existing structures and enhance their ability to withstand earthquakes.

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In light of the grave tsunami threat, it is crucial for authorities, communities, and individuals to take immediate action and prepare accordingly. The lessons learned from the 2004 Indian Ocean tsunami should serve as a stark reminder of the importance of preparedness and mitigation efforts.

Next Article:
Megathrust Waiting to Strike Java & Sumatra? Here’s What Experts Say