Mount Semeru, located in East Java, showed an increase in volcanic activity again on Sunday (14/6/2026) morning. According to a report from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the eruption occurred at precisely 05:28 WIB, spewing an ash column 400 meters above the peak, or reaching 4,076 meters above sea level.
The observed ash column was thick with a dominant white to gray color, moving to the southwest. This phenomenon was clearly recorded on a seismograph with a maximum amplitude of 21 millimeters and lasted for 93 seconds. The intensity of this eruption confirms that Semeru's activity remains high, given that over the past week, the highest volcano on Java Island has erupted 59 times.
To date, the status of Mount Semeru remains set at Level III or Alert. Monitoring data throughout the previous night also recorded significant seismic activity, including 11 eruption earthquakes, as well as pyroclastic flows and lava flows recorded by the monitoring station.
In connection with these conditions, PVMBG issued a firm warning for residents and climbers. People are strictly forbidden from carrying out any activities in the southeastern sector along Besuk Kobokan within a 13-kilometer radius from the eruption center. In addition, residents are urged to keep a safe distance of 500 meters from the riverbanks along the Besuk Kobokan flow to anticipate the danger of pyroclastic flows and lahar flows that have the potential to extend up to 17 kilometers.
Statistical records show that throughout 2026, Mount Semeru has been the most active volcano in Indonesia, with a total of 1,248 eruptions out of a total of 2,621 volcanic eruptions recorded across the country up to mid-June.
