Title: Megathrust Earthquake Threat Looms Over Jakarta and Southern Java
BRIN‘s Latest Research: Megathrust Earthquake in Indonesia
In a recently published study, the National Research and Innovation Agency (BRIN) sounded the alarm on the potential threat of a megathrust earthquake in Indonesia. The Indonesian island of Java’s southern coast and the Sunda Strait have been identified as high-risk zones.
Puslitbang Kebencanaan Geologi BRIN researcher, Nuraini Rahma Hanifa, revealed that the research shows the southern Java segment, including the Sunda Strait, has significant tectonic energy that could trigger magnitude 8.7 to 9.1 earthquakes. This, in turn, could cause major seismic shaking and potentially catastrophic tsunami waves that could reach Jakarta in approximately 2.5 hours.
Simulation: Expected Tsunami Height
Based on simulations conducted by BRIN in collaboration with various international research teams, if a tsunami were to occur, waves up to 20 meters high could inundate the southern coast of Java, 3-15 meters in the Sunda Strait, and around 1.8 meters in northern Jakarta. These findings echo historical events like the 2006 Pangandaran tsunami, which was triggered by a marine landslide near Nusa Kambangan.
Accumulating Energy
Rahma warns that the energy stored in the southern Java subduction zone continues to build over time. If released abruptly, it could generate massive tsunami waves with far-reaching effects, not just along the southern coast of Java but also in other coastal regions.
Mitigation Measures
In densely populated areas like Jakarta, retrofitting or strengthening building structures is crucial. This is especially important to mitigate potential damage and loss of life in high-risk zones.
Industrial areas such as Cilegon also face secondary hazards, including the potential for fires caused by fuel or chemical leaks from factories. Proactive safety measures and adherence to strict safety standards can help prevent such incidents.
Historical Perspective
Through paleotsunami studies, BRIN researchers found that megathrust earthquakes off southern Java occur roughly every 400-600 years. Given the last known occurrence in 1699, today’s energy levels have reached a critical point.
"Lessons from the 2004 Indian Ocean Tsunami show that preparedness and mitigation are key to saving lives," Rahma stresses.
Stay Informed: Watch the following video for more details:
Video: Tsunami Threat: Megathrust Earthquake Could Devastate Jakarta and Southern Java
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