Mount Semeru showed increased volcanic activity again on Thursday (2/7/2026) afternoon. According to reports from the Mount Semeru Observation Post, the eruption occurred at exactly 16:37 WIB, with an ash column observed rising up to 1,500 meters above the peak, or reaching 5,176 meters above sea level.
Observation Post officer, Liswanto, explained that the ash column appeared white to gray with moderate intensity, drifting toward the southeast. Seismograph recordings showed a maximum amplitude of 22 mm, with the initial eruption duration recorded at six minutes and 40 seconds.
The impact of this eruption triggered pyroclastic flows traveling up to 4 kilometers toward the Besuk Kobokan sector. As of this report, volcanic activity is still observed to be ongoing, meaning Mount Semeru's status remains at Level III (Alert).
Authorities emphasized the importance of public compliance with the established exclusion zones. Residents are strictly prohibited from conducting any activities in the southeastern sector along Besuk Kobokan within a 13-kilometer radius from the eruption center. Additionally, a 5-kilometer radius from the crater has also been declared dangerous due to the risk of incandescent rock ejection.
The public is urged to remain vigilant against potential threats of pyroclastic flows, lava flows, and cold lahars (mudflows), especially along river basins originating from the mountain's peak, such as Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat.
