Back to today’s briefing

Story perspectives

Mount Semeru Erupts Again, Alert Level Raised to III

12/21/2025

35 8 Full Breakdown

Summary

Story summary

Mount Semeru erupted on December 18, 2025, at 7:10 PM WIB, its 23rd eruption in a week.
An ash column formed.
Seismic data recorded a maximum amplitude of 22 millimeters over 117 seconds.
The Center for Volcanology and Geological Hazard Mitigation (PVMBG) raised the activity level to Level III (Alert).
PVMBG advised avoiding the Besuk Kobokan sector, 13 km from the peak, due to hot clouds and lava flows.

1 of 1

Story summary

Mount Semeru erupted on December 18, 2025, at 7:10 PM WIB, its 23rd eruption in a week.
An ash column formed.
Seismic data recorded a maximum amplitude of 22 millimeters over 117 seconds.
The Center for Volcanology and Geological Hazard Mitigation (PVMBG) raised the activity level to Level III (Alert).
PVMBG advised avoiding the Besuk Kobokan sector, 13 km from the peak, due to hot clouds and lava flows.