Mount Semeru recorded 1,263 eruptions from January 1 to June 16, 2026, making it Indonesia's most active volcano.
Data from magma.esdm.go.id shows Mount Semeru surpassing Mount Ibu, which recorded 930 eruptions, and Mount Lewotobi Laki-laki with 215 eruptions.
Volcanic smoke was seen emerging from Semeru's crater in Candipuro district, Lumajang, East Java on June 16, 2026.
The ranking is based on activity during the first six months of 2026.
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The National Disaster Management Agency reported one resident killed by a magnitude 6.7 earthquake that struck Central Sulawesi on Tuesday, June 16, 2026.
Researchers have found that the magma reservoir beneath Japan's Kikai caldera, site of the Holocene's largest eruption 7,300 years ago, is refilling with newly injected magma. Using underwater seismic imaging, a team led by Kobe University's Nobukazu Seama mapped the reservoir and linked it to the ancient event. The discovery offers insights into how such systems rebuild after massive eruptions.
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Rescue teams found the bodies of two Singaporean climbers missing after the Mount Dukono eruption on Sunday.