Indonesia’s Geological Agency has confirmed that any future eruption at Mount Anak Krakatau will lack the catastrophic scale of the 1883 disaster, citing the volcano’s significantly smaller physical dimensions.
The agency’s assessment comes as public concern persists regarding the volcano’s activity, which has been closely monitored by the Center for Volcanology and Geological Hazard Mitigation (PVMBG). While the 1883 eruption of Krakatau remains a defining moment in volcanic history, experts emphasize that current conditions are not comparable.
Yasa Suparman, an Associate Earth Investigator at the Geological Agency, explained that the current volume of Anak Krakatau is estimated at only 2 to 5 percent of the original volcano’s size. “In terms of surface area, it is currently only about one-tenth of what it was in 1883,” Yasa told Tempo.co.
The agency released these findings to provide a more proportionate view of the volcano’s current state. “The message of this book is that people should view Anak Krakatau’s current activity more proportionately and should not panic excessively when they hear about an eruption,” Yasa said after a discussion of the book Krakatau 1883 in Bandung on Wednesday.
Geological Barriers to a Repeat Disaster
The potential for a 19th-century style catastrophe is limited by more than just volume. The mechanisms required for a massive tsunami—which claimed thousands of lives in 1883—rely on specific geological precursors, including the collapse of a much larger volcanic edifice. Current monitoring data from the PVMBG suggests that the structural integrity and age of the present-day Anak Krakatau do not mirror those of its predecessor.
The distinction between the two volcanoes is central to the agency’s public outreach efforts. By examining the geological and geophysical perspectives of the 1883 event, the agency aims to replace fear with data-driven understanding. “Through this book, we seek to examine Krakatau in greater detail from geological and geophysical perspectives, while also discussing the current condition of Anak Krakatau and its monitoring system,” Yasa said.
Geological Agency Monitors Anak Krakatau Status and Emissions
Mount Anak Krakatau has remained under active surveillance, with its status fluctuating based on seismic readings and gas emissions. As of early November 2026, the volcano was maintained at Alert Level III, though the Geological Agency had downgraded it to Level II (Caution) less than three weeks prior.
The PVMBG continues to issue regular updates to ensure public safety in the Sunda Strait region. Residents and visitors are urged to follow official recommendations rather than relying on historical associations with the name “Krakatau,” which often trigger unnecessary alarm. The agency maintains that while volcanic activity is a natural occurrence, the current morphology of the island prevents a recurrence of the 1883 event’s scale.
The Scientific Perspective on Volcanic Hazard
The Center for Volcanology and Geological Hazard Mitigation emphasizes that the characteristics of any eruption at Anak Krakatau would be significantly different from the 1883 disaster due to major differences in the volcano’s current morphology.
“The tsunami would also be very different. As our speakers have explained, several conditions would need to be met for an eruption as powerful as the one in 1883 to occur. These include the volcano’s dimensions, its age and a similar eruption mechanism. However, in terms of its dimensions, the current volcano is still very different,” said Yasa Suparman, Associate Earth Investigator at the Geological Agency.
As the agency continues its work to demystify the geological history of the Sunda Strait, the focus remains on the current, measurable behavior of the volcano rather than historical speculation.
