Mount Anak Krakatau erupts again, prompting 3-km safety zone in Sunda Strait

Mount Anak Krakatau in Indonesia erupted repeatedly from late Friday, September 4, into the early morning of September 5, according to monitoring bulletins from Magma Indonesia and the Centre for Volcanology and Geological Hazard Mitigation (PVMBG). The first tremor was recorded at 04:28 local time, followed by a second eruption at 05:46 that sent a black ash column roughly 300 metres above the peak and drifting west-northwest.

Activity surged after 22:00, culminating in a continuous eruption that lasted into the next day, with a notable blast at 00:01. PVMBG and the Ministry of Energy and Mineral Resources have issued a safety advisory requiring a 3-kilometre buffer around the crater for tourists, fishermen, hikers and local residents. Real-time seismic data are being fed to regional authorities in Banten and Lampung, while the Coast Guard, Navy and harbour masters work to keep commercial vessels and ferry routes at a safe distance. Local disaster management agencies remain on alert for ash fall and other volcanic hazards.