Mount Semeru, located in East Java, showed significant volcanic activity again on Tuesday (7/7/2026). According to a report from the Center for Volcanology and Geological Hazard Mitigation (PVMBG), the eruption was recorded at 14:35 WIB, spewing an ash column 700 meters above the peak, or approximately 4,376 meters above sea level.
Data from the MAGMA Indonesia application noted that the ash column was white to gray with quite thick intensity, leaning toward the northeast. The eruption was recorded on a seismograph with a maximum amplitude of 13 millimeters and a duration of 95 seconds. This week alone, the highest mountain on Java Island has erupted 10 times.
To date, the status of Mount Semeru remains at Level III (Alert). Intensive observation over the last six hours, from 06:00 to 12:00 WIB, detected 14 eruption earthquakes, one rockfall earthquake, and three gust earthquakes. This relatively high frequency of activity places Semeru as the volcano with the highest eruption intensity in Indonesia throughout 2026, with a total of 1,342 eruptions as of early July.
Authorities issued a strict warning to the public and climbers not to carry out any activities in the southeastern sector along Besuk Kobokan, within a radius of 13 kilometers from the eruption center. In addition, the public is asked to stay away from riverbank areas along that route up to a distance of 500 meters, given the real threat of pyroclastic flows and lahar flows that could reach up to 17 kilometers from the peak.
