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View all search resultsMt. Semeru erupts, dozens of homes buried by rain lahar, hundreds flee to hills
The volcano has been highly active lately, with earlier eruptions occurring on Dec. 5 and Nov. 19.
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Mount Semeru in Lumajang regency, East Java, erupted on Dec. 8, 2025, spewing ash some 1,000 meters above its summit. The eruption also sent molten lava flowing down the mountain’s slopes. (Antara/PVMBG)
M
ount Semeru in Lumajang regency, East Java, erupted again on Monday evening, sending an ash column 1,000 meters above its summit and producing molten lava flows.
Officials at the Semeru Volcano Observation Post reported the eruption occurred at 9.24 p.m. local time.
“An eruption of Mount Semeru took place on Dec. 8, 2025, at 9.24 p.m.,” said Mukdas Sofian in a written statement received in Lumajang.
Mukdas added that the ash column appeared white to gray, with thick intensity, drifting southwest.
The activity was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 182 seconds. In addition to the ash plume, the 3,676-meter-high volcano, the tallest peak on Java, also discharged incandescent lava clearly visible streaming down from the summit.
Read also: East Java's Semeru volcano erupts, alert level raised to highest
Semeru has been very active lately, having previously erupted on Dec. 5 and Nov. 19.
