Overall Green alert Volcanic eruption for Semeru
in Indonesia

Event summary

Volcanic eruption Semeru can have a low humanitarian impact based on the exposed population and vulnerability.

GDACS ID VO 1000035
Name: Semeru
Lat/Lon: -8.108 , 112.922
Event Date: 03 Jan 2022 UTC
Exposed Population 30km: About 870000 people within 30km
Exposed Population 100km: About 19740000 people within 100km
Max Volc. Explosivity Index VEI: 3
Population Exposure Index PEI: 5
Inserted at: 05 Dec 2021 05:27 UTC


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Virtual OSOCC
Meteo assessment
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Indonesia - Mount Semeru Volcanic Eruption (ECHO 05 Dec 2021)Sun, 05 Dec 2021 11:22

  • Explosive activity at Mt. Semeru escalated on 4 December with an explosion at 14:50 WIB (UTC+7) producing an ash plume up to 15.2 km
  • As of 08:30 UTC on 5 December, the national disaster management agency, BNPB, is reporting 13 fatalities, with seven people missing and dozens injured. Hundreds took refuge in evacuation halls.
  • Rockfalls and pyroclastic density currents have been reported by the seismic network and visual observations, while seasonal rain and thunderstorms that are forecast for the coming days present an increased risk of rain-triggered lahars. 
  • A number of villages have been covered in up to 4 metres of volcanic ash and sand, while housing, roads and bridges have been damaged. The BNPB is supporting in the immediate aftermath with helicopters, heavy machinery, food, shelter and PPE such as face masks. 
Indonesia - Mount Semeru volcanic eruption, update (ECHO 06 Dec 2021)Mon, 06 Dec 2021 12:02

  • The activity of  Mount Semeru, located in Lumajang Regency (East Java Province), is ongoing. Six explosions have been recorded after the main event occurred on 4 December, where pyroclastic flows affected several parts of Lumajang Regency. 
  • According to the Indonesian National Board for Disaster Management (BNPB), the number of fatalities has increased to 15 and 27 people are missing, and 169 have been injured. More than 1,700 people have been displaced in 19 refugee posts, 5,205 people have been affected as well as 2,970 houses across Lumajang Regency and Malang Regency in Java Province.
  • National and local authorities are providing help for those affected with family equipment, masks, ready-to-eat food, side dishes and blankets.
  • The Multiplatform Application for Geohazard Mitigation and Assessment in Indonesia (MAGMA) reports that the alert level is at 2 (on a scale from 1 to 4).
  • For the next 24 hours, light rain is expected across Lumajang Regency.
Indonesia - Mount Semeru volcanic eruption, update (ECHO 07 Dec 2021)Tue, 07 Dec 2021 12:12

  • On 6 December at 10.54 UTC, Mount Semeru, located in East Java Province,  erupted again and an ash column was observed approximately 1,000 m above the peak. The number of casualties, following the main eruption of 4 December has been rising.
  • The number of fatalities has increased to 34 and 17 people remain missing. At least 5,205 people affected, including 3,697 people displaced according to the Indonesian National Board for Disaster Management (BNPB).
  • More than 980 joint personnel deployed by national authorities are conducting the search and evacuation activities.
  • There is a need for further preparation of evacuation centres, public kitchens and vehicles for relief item distribution. At least 58 institutions, ranging from government agencies, NGOs, Indonesian Red Cross and private sector are providing assistance.
  • The alert level of the volcano stands at 2 (on a scale from 1 to 4) as reported by the Multiplatform Application for Geohazard Mitigation and Assessment in Indonesia (MAGMA). 
Detailed event map. European Union, 2022. Map produced by EC-JRC.
The boundaries and the names shown on this map do not imply official endorsement or acceptance by the European Union.

Updates on volcanic activity (Smithsonian)

The Smithsonian/USGS Weekly Volcanic Activity Report provides information about global volcanism on a weekly basis. See the detail here

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Estimated casualties (PAGER)

USGS estimates the number of casualties for each earthquake for the Prompt Assessment of Global Earthquakes for Response (PAGER) product.
The graph shows the current fatalities estimate.

Exposed population

Data, images, links, services and documents

For this events, GDACS has links to information from the following sources: EC-JRC (31), (1), INGV (2), DesInventar (1), WMO (1), INFORM (2),