Indonesia, Semeru Volcano Eruption (East Java)

information as of 20 November 2025 at 0600H UTC+7 as follows:


Chronology:
An eruption of Mount Semeru, East Java, occurred on 19 November 2025 at 16:00 WIB, producing an ash column approximately 2,000 meters above the summit (about 5,676 meters above sea level). The ash column was observed to be gray with thick intensity, drifting toward the north and northwest. The eruption was recorded on the seismogram with a maximum amplitude of 40 mm and a duration of approximately 16 minutes and 40 seconds.

Affected Locations (2 Sub-Districts / 4 Villages):

Pronojiwo Sub-District

Supit Urang Village

Candipuro Sub-District

Penanggal Village

Casualties:

137 hikers were trapped at Ranu Kumbolo, Semeru

Approximately 800 displaced persons are currently sheltering at:

Oro-oro Ombo Village Hall: ± 200 persons

Ar-Rahmah Mosque: ± 300 persons

Penanggal Village Hall: data verification ongoing

Supiturang Elementary School 2: ± 200 persons

Supiturang Elementary School 4: ± 100 persons

Material Losses:

Assessment ongoing

Response Actions:

Lumajang Regency BPBD

Conducting assessment and documentation

Deploying TRC BPBD Lumajang teams to the field

PVMBG

Issuing advisories urging residents along river valleys to remain vigilant due to potential pyroclastic density currents

Preparing press releases and information on changes to Semeru’s alert level

PPGA Semeru

Continuing monitoring and reinforcing public advisories and preparedness

Status:

Special Report No. 144/GL.03/BGL/2025: Alert level raised from Level II (Alert) to Level III (Standby) on 19 November 2025 at 16:00 WIB

Special Report No. 145/GL.03/BGL/2025: Alert level raised from Level III (Standby) to Level IV (Warning) on 19 November 2025 at 17:00 WIB

Lumajang Regent’s Decree No. 100.3.3.2/595.KEP/427.12/2025 on Emergency Response Status for the 2025 Mount Semeru Eruption