The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Tengger Caldera on 4 September 2025 (local). The alert level at Tengger Caldera remained at „Level 2 – Alert“ (on a 4-level scale). Plumes rose to a maximum of 600 meters (1,969 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
Current Alerts:
Observatory alert level: „Level 2 – Alert“ (on a 4-level scale)
Aviation Alert Level: unavailable or not collected
Adapted from: Smithsonian / USGS Daily Volcanic Activity Report for Sep 4, 2025