Mount Semeru, the highest point on Java Island at 3,676 meters above sea level (masl), has once again shown a significant increase in volcanic activity. Throughout Wednesday, July 1, 2026, the volcano located in East Java was reported to have experienced four consecutive eruptions from early morning until near noon.
According to a report from the Mount Semeru Observation Post, the series of eruptions began at 00:52 WIB with an ash discharge reaching 700 meters. Activity continued at 08:14 WIB with an eruption column height of 800 meters leaning towards the east and southeast. The intensity of the eruptions then increased at 09:24 WIB and 10:10 WIB, where the volcanic ash column was recorded reaching a height of up to 1 kilometer above the peak.
Observation officers noted that each eruption had an average duration of over 80 seconds with a maximum amplitude of 22 mm. The spread of volcanic ash from these eruptions was observed moving in various directions, including northeast, east, southeast, and south, depending on the wind direction around the crater.
In response to the series of activities, the Regional Disaster Management Agency (BPBD) of Lumajang Regency confirmed that the situation remains under close monitoring. The Chief Executive of BPBD Lumajang, Isnugroho, stated that his party has not received any reports of ashfall impacting residential areas around the mountain slopes.
