April 16, 2026 | 09:49 am
TEMPO.CO, Jakarta - The eruption of Mount Semeru in Indonesia occurred again on Thursday morning, April 16, 2026, at 06:21 AM WIB (Western Indonesian Time). The Mount Semeru Observation Post reported that the observed height of the ash column was approximately 1,200 meters above the peak (about 4,876 meters above sea level).
Liswanto, an officer at the Mount Sawur Observation Post in Sumber Wuluh Village, Candipuro District, Lumajang Regency, stated that the observed ash column was white to gray with moderate intensity leaning towards the northeast. The eruption was also recorded on a seismogram with a maximum amplitude of 22 mm and a duration of not less than 2 minutes.
Approximately half an hour later, a subsequent eruption occurred with a column height of 1,100 meters above the peak (about 4,776 meters above sea level). The observed ash column was white to gray with moderate intensity towards the northeast. "Currently, Mount Semeru is at Level III (Alert) status," said Liswanto in his report on Thursday.
Meanwhile, based on seismic observations during the last six hours from early Thursday at 00:00 AM WIB to 06:00 AM WIB, the Mount Semeru Observation Post recorded several seismic activities, including 19 times of eruption/explosion earthquakes with amplitudes of 10-22 mm and durations of 81-189 seconds; 3 times of emission earthquakes with amplitudes of 2-6 mm and durations of 46-118 seconds.
Additionally, it was noted that there was 1 harmonic earthquake with an amplitude of 1 mm and duration of 448 seconds, as well as 2 distant tectonic earthquakes with amplitudes of 3-22 mm, S-P 15-29 seconds, and durations of 51-192 seconds.
At the current Alert Level, the Center for Volcanology and Geological Hazard Mitigation (PVMBG) has issued several recommendations, including refraining from any activities in the southeastern sector along Besuk Kobokan, up to 13 kilometers from the peak (the eruption center).
Beyond this distance, the public is advised not to engage in activities within 500 meters from the river's edge (riverbanks) along Besuk Kobokan due to the potential impact of pyroclastic flow expansion and lahar flow up to 17 kilometers from the peak, as well as to not engage in activities within a 5-kilometer radius from the crater/peak of Mount Semeru due to the risk of projectile rockfall (volcanic bombs).
Residents are requested to be wary of the potential for pyroclastic flows, lava avalanches, and lahars along the river/valley flowing from the peak of Mount Semeru, especially along Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat, as well as the potential for lahars in small rivers that are tributaries of Besuk Kobokan.
Read: Mount Semeru Eruption Sends 4.5km of Pyroclastic Flow
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