Mount Semeru, located on the border of Lumajang and Malang Regencies, East Java, was reported to have erupted again on Friday (19/6/2026) morning. This volcanic phenomenon was accompanied by pyroclastic flows reaching a distance of 4.5 kilometers toward the Besuk Kobokan sector.
Mukdas Sofian, an officer at the Mount Semeru Observation Post, revealed that the eruption occurred precisely at 07:21 WIB. The eruption column was observed rising up to 1,000 meters above the peak, reaching 4,676 meters above sea level. Thick volcanic ash, predominantly white to gray in color, moved north and northwest.
Based on seismogram data, this eruption had a maximum amplitude of 22 millimeters and lasted for 5 minutes and 33 seconds. Authorities recorded that today the highest mountain on Java Island has erupted six times, with eruption column heights ranging between 700 and 1,000 meters.
Currently, Mount Semeru's alert status remains at Level III (Alert). The public is advised to refrain from activities in the southeastern sector along Besuk Kobokan within a 13-kilometer radius from the eruption center. In addition, residents are prohibited from conducting activities within a 5-kilometer radius of the crater to avoid the risk of incandescent rocks being thrown.
Residents living near river basins originating from Mount Semeru, such as Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat, are urged to heighten vigilance regarding potential pyroclastic flows and cold lava flows. Authorities also stressed the importance of maintaining a safe distance of 500 meters from riverbanks along Besuk Kobokan.
