Mount Semeru in East Java has once again shown a significant increase in volcanic activity. According to the latest report from the Mount Semeru Observation Post on Sunday (5/7/2026), incandescent lava flows were observed traveling up to 1,500 meters from the peak crater toward the southeast, specifically to the Besuk Kobokan area.
In addition to the lava flows, officials recorded at least eight eruptions during the same observation period. These eruptions triggered grey ash columns reaching a height of 800 meters above the peak, which were carried by the wind to the southeast, east, and north.
Yadi Yuliandi, an observation post officer, emphasized that the mountain's status still requires high vigilance from the local community. His office issued a strict advisory warning residents not to engage in any activities within a 13-kilometer radius of the eruption center to avoid unwanted risks.
Furthermore, residents living near river basins originating from Mount Semeru are urged to remain vigilant against the potential threat of pyroclastic flows (hot clouds of ash) and lahar floods. This precautionary measure is deemed crucial given the weather conditions and the still-fluctuating activity of the mountain.
