Mount Semeru, located in East Java, has once again shown a significant increase in volcanic activity. According to data from the Mount Semeru Observation Post on Friday (10/7/2026), five eruptions were recorded, triggering grey ash columns reaching heights of up to 500 meters heading east.
In addition to the eruptive activity, observers noted incandescent lava flows rapidly descending from the summit crater. The sliding distance of the incandescent lava was observed to reach 1,500 meters or 1.5 kilometers, moving southeast toward the Besuk Kobokan area.
In response to the situation, relevant authorities issued a stern warning to the local community. Residents are strictly prohibited from conducting any activities along the Besuk Kobokan river flow, particularly within a 13-kilometer radius from the summit, to avoid unwanted risks.
Furthermore, residents living near river basins originating from Mount Semeru are asked to exercise extra vigilance regarding the threat of pyroclastic flows, lava flows, and potential cold lahar floods that could occur at any time, especially during periods of increased rainfall.
