Signalling heightened volcanic activity across the Sunda Strait maritime corridor, Mount Anak Krakatau in Indonesia experienced a series of explosive eruptions spanning from late Friday, September 4 into the early weekend hours of September 5, CNN Indonesia reports. According to official monitoring bulletins issued by Magma Indonesia, under the Centre for Volcanology and Geological Hazard Mitigation (PVMBG) and the Ministry of Energy and Mineral Resources (ESDM), Mount Anak Krakatau erupted again at 00:01 local time. The midnight eruption followed multiple eruptive pulses recorded throughout the day before on September 4.

According to official seismographic logs, the eruptive sequence began on September 4, at 04:28 local time with a maximum seismograph amplitude of 70 mm and a duration of 31 seconds. A second primary eruption occurred at 05:46 local time, generating a dense black ash column that reached approximately 300 metres above the peak (~457 metres above sea level), drifting west and northwest. Volcanic activity intensified after 22:00 local time on September 4, culminating in the continuous eruption recorded through to September 5.

PVMBG authorities have issued an official safety advisory instructing tourists, fishermen, hikers, and local residents to maintain a strict 3-kilometre safety radius from the active crater. The exclusion zone aims to protect maritime traffic and coastal communities along the Banten and Lampung coastlines from potential ash fall, incandescent rock ejecta, and volcanic hazards.

To safeguard regional maritime traffic and coastal communities, volcanological monitoring agencies route real-time seismic data directly into public hazard advisories. At this time, the local government continues to track seismic amplitude changes and ash plume directions, allowing PVMBG to provide timely updates to regional authorities in Banten and Lampung.

Coordinating between the Coast Guard (KPLP), Navy, and local harbour masters ensures commercial shipping and ferry routes maintain a safe distance from the volcano. Providing clear public safety updates helps prevent panic while ensuring local disaster management agencies (BPBD) remain prepared for potential ash fall, the report adds.

There have been a total of six volcanic eruptions from Indonesian volcanoes recorded in 2026 alone, Jakarta Globe reports. PVMBG said that there’s no evidence that a single geological event triggered all the activity.