Mount Semeru Erupts Three Times Monday Morning, Sending Ash 1,000 Meters High
Mount Semeru in East Java, Indonesia, erupted three times on Monday morning, ejecting volcanic ash up to 1,000 meters into the air. Authorities have maintained a Level III alert status and restricted activity near the Besuk Kobokan River due to potential pyroclastic flows.
Why it matters
Regular monitoring of volcanic activity is essential for disaster mitigation and protecting local populations from hazardous eruptions.
September 14, 2026 | 7:44 am SHARE URL berhasil di salin. This image provided by the Mount Semeru Observation Post shows the volcano in East Java spewing thick ash into the air on Monday, Sept. 14, 2026. Lumajang, East Java. Mount Semeru erupted three times on Monday morning, sending volcanic ash as high as 1,000 meters above its summit, according to an observation post monitoring Indonesia's tallest volcano.
The first eruption occurred at 4:20 a.m. Western Indonesia Time, producing an ash column about 500 meters above the summit, or 4,176 meters above sea level.
"The ash column was observed to be white and gray with thick intensity, moving northwest. The eruption was recorded on a seismograph with a maximum amplitude of 21 millimeters and a duration of 128 seconds," Mount Semeru Observation Post officer Sigit Rian Alfian said in a report.
Get smarter about the news
Sign up free for a feed built around what you actually care about, Dive Deeper research on any story, and the full text of every article.
Create free accountAlready have an account? Sign in