Mount Semeru, located in East Java, has once again shown volcanic activity with an eruption occurring on Saturday (13/6/2026) at exactly 04:44 WIB. According to data from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, this event adds to the long list of the volcano's seismic activity, with 52 eruptions recorded over the past week.
Although the visual of the eruption was not directly observed due to heavy fog or other factors, the seismograph recorded eruption vibrations with a maximum amplitude of 22 millimeters and a duration of 136 seconds. Mount Semeru's volcanic activity currently remains at Level III (Alert), indicating a high level of vigilance for local residents.
Seismic reports gathered during the night period before the eruption, between 18:00 and 23:59 WIB, recorded a significant intensity of activity. It was noted that there were 10 eruption earthquakes, one avalanche earthquake, and five gust earthquakes. This indicates that Mount Semeru is still actively generating volcanic energy.
In response to these conditions, PVMBG issued strict recommendations for the public. Residents are strictly prohibited from conducting any activities in the southeastern sector along Besuk Kobokan within a 13-kilometer radius from the eruption center. In addition, the public is urged to maintain a safe distance of 500 meters from the riverbanks along Besuk Kobokan, given the threat of expanding pyroclastic flows and lahar flows that could potentially reach a distance of 17 kilometers.
Throughout 2026, MAGMA Indonesia's records show that Mount Semeru has been the most active volcano in the country. Out of a total of 2,596 eruptions recorded across Indonesia, Mount Semeru contributed the most, recording 1,241 eruptions.
