Mount Semeru, located in East Java, was reported to have erupted again on Tuesday (7/7/2026) evening at 17:45 WIB. This event adds to the long list of volcanic activities of the highest mountain on Java Island, which has been recorded to have erupted 12 times within the past week.
Based on data from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia system, an ash column was observed rising 700 meters above the peak, reaching 4,376 meters above sea level. The white-to-gray volcanic material moved towards the north and northeast. This activity was recorded on a seismograph with a maximum amplitude of 22 millimeters and lasted for 129 seconds.
To date, the activity status of Mount Semeru remains set at Level III or Alert (Siaga). Seismic records show a high level of activity, where during the period of 06:00 to 12:00 WIB alone, 14 eruption earthquakes occurred, followed by avalanche earthquakes and gust earthquakes indicating magma movement beneath the surface.
Responding to these conditions, authorities have strictly prohibited community activities in the southeastern sector along Besuk Kobokan, within a 13-kilometer radius from the eruption center. In addition, residents are banned from approaching areas within a 500-meter radius of the riverbanks along the Besuk Kobokan path, given the risk of pyroclastic flows (hot clouds) and cold lava flows that could reach up to 17 kilometers from the peak.
MAGMA Indonesia data records that throughout 2026, Mount Semeru has been the most active volcano in Indonesia, with a total of 1,344 eruptions. The public is urged to always follow official directives from the relevant authorities and not be easily influenced by unverified information.
