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Krakatau Volcano Indonesia Erupts: Anak Krakatau Remains on Alert as Ash Disrupts Travel
- 2 days ago
- 4 min read
Indonesia's Anak Krakatau volcano is once again attracting international attention after a period of sustained volcanic activity disrupted air travel and sent volcanic ash across parts of western Indonesia.
The volcano, located in the Sunda Strait between Java and Sumatra, experienced a continuous eruption beginning late on September 4 and continuing for roughly 25 hours before the episode ended early on September 6. Despite the end of the continuous eruption, Indonesian authorities are maintaining the volcano at Level III, or Siaga (Alert), and warn that further eruptions remain possible.
According to Indonesia's Geological Agency and the Center for Volcanology and Geological Hazard Mitigation (PVMBG), the latest continuous eruptive episode began at approximately 11:07 p.m. local time on September 4.
The activity included strong volcanic sounds, rumbling and a phenomenon described as a lava fountain, in which molten material was expelled from the active crater. The continuous episode officially ended at around 12:04 a.m. on September 6. A subsequent Strombolian-type eruption was recorded several hours later.
PVMBG reported that volcanic energy had begun showing a declining trend on September 6. However, officials stressed that declining activity does not mean the volcano has become inactive, and the possibility of additional eruptions remains.
Volcanic Ash Disrupts Air Travel
One of the most immediate effects has been the spread of volcanic ash through the atmosphere.
Indonesia's Meteorology, Climatology and Geophysical Agency (BMKG) has been monitoring the ash's movement because of its potential impact on aviation and atmospheric conditions. Satellite analysis on September 6 identified ash distribution extending across areas including Banten, Jakarta, West Java and Bengkulu.
Several airports temporarily suspended operations as a safety precaution because of the ash.
Authorities reported temporary closures involving Soekarno-Hatta International Airport, Halim Perdanakusuma Airport, Radin Inten II Airport in Lampung and Budiarto Airport in Curug during the morning of September 6.
The disruption demonstrates how volcanic activity from a relatively remote island can quickly affect transportation and economic activity across a much wider region.
Why Krakatau Remains Closely Watched?
The name Krakatau carries particular significance in Indonesian history. The original Krakatau volcano produced a catastrophic eruption in 1883, generating powerful explosions and tsunamis that affected surrounding coastal areas. Anak Krakatau emerged from the same volcanic system after the 1883 disaster and has remained active for decades. Its history became especially significant again in December 2018, when a portion of Anak Krakatau collapsed following volcanic activity and triggered a tsunami around the Sunda Strait. The disaster killed hundreds of people. However, authorities emphasize that the current situation should not automatically be compared with 2018. Indonesia's Geological Agency said the rebuilt portion of Anak Krakatau remains relatively small following the 2018 collapse and, based on its current assessment, does not have the scale necessary for a collapse capable of generating a tsunami. Nevertheless, scientists continue to monitor changes in the volcano's structure and activity.
What Is the Current Alert Level?
As of September 6, Anak Krakatau remains at Level III — Siaga. Under the current recommendation, people are prohibited from entering or conducting activities within a 3-kilometer radius of the volcano's active crater.
Authorities are also warning of potential hazards including lava flows, glowing rock fragments, heavy volcanic ash and other eruptive material.
People living along the Banten and Lampung coasts have been advised to remain calm while continuing to follow official instructions from local disaster-management authorities.
Monitoring Continues Around the Sunda Strait
The latest eruption has prompted increased monitoring of the atmosphere, aviation routes and marine conditions around the Sunda Strait. BMKG has intensified 24-hour monitoring and has issued multiple aviation weather warnings, known as SIGMETs, following the eruption. These warnings are designed to help aviation authorities and airlines manage the risks associated with volcanic ash. For travelers, airlines and businesses operating around western Indonesia, conditions can change quickly depending on wind direction and the movement of ash clouds. Passengers are therefore being encouraged to check directly with airlines and airports before traveling.
A Reminder of Indonesia's Volcanic Landscape
The renewed activity at Anak Krakatau is another reminder of Indonesia's position within one of the world's most volcanically active regions. Indonesia sits along the Pacific Ring of Fire and has numerous active volcanoes. For communities living near these geological systems, volcanic monitoring is an essential part of disaster preparedness. The latest Anak Krakatau episode also demonstrates the importance of modern monitoring technology. Seismic instruments, cameras, satellite observations and atmospheric monitoring allow authorities to track changes and communicate risks much faster than was possible in previous generations.
What Happens Next?
For now, the focus is on continued monitoring. Although the latest continuous eruption has ended, PVMBG says volcanic activity has not necessarily stopped. The volcano remains at Level III, and authorities will continue evaluating its activity and morphology. The immediate priority is keeping people away from the danger zone, monitoring volcanic ash and protecting aviation and coastal communities. For Indonesia, the latest Krakatau Volcano Indonesia activity is a powerful reminder that the country's spectacular volcanic landscape comes with real and constantly changing natural risks. As Anak Krakatau continues to evolve, scientists and authorities will be watching closely for any changes that could alter the current risk assessment.
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