Overall Green alert Volcanic eruption for Lewotolo
in Indonesia

Event summary

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

GDACS ID VO 1000006
Name: Lewotolo
Lat/Lon: -8.272 , 123.505
Event Date: 06 Dec 2020 00:00 UTC
Exposed Population 30km: About 140000 people within 30km
Exposed Population 100km: About 460000 people within 100km
Max Volc. Explosivity Index VEI: 3
Population Exposure Index PEI: 4
Inserted at: 07 Dec 2020 08:26 UTC


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Indonesia - Volcanic activity Wed, 02 Dec 2020 10:24

  • On 1 December at 16:18 UTC, a new significant eruption of Lewotolo Volcano (Lembata Island, south-eastern Indonesia) have been observed and the ash column reached up to 500 m above the summit of the crater.
  • According to the Indonesian National Board for Disaster Management (BNPB), the number of evacuated people in 7 evacuation points has increased to 7,968 people. The authorities recommend to do not any activities within a 4 km radius (danger zone) from the summit crater.
  • The Darwin Volcanic Ash Advisory Centre (VAAC) maintain the red aviation colour code for Lewotolo.


Indonesia - Volcanic activity (ECHO 30 Nov 2020)Mon, 30 Nov 2020 02:00

  • On 28-29 November, the eruption of Ili Lewotolo volcano (Lembata Regency, Solor Archipelago, south-eastern Indonesia) caused the evacuation of 2,782 people to 6 refuge points in Lembata Regency.
  • According to the Indonesian National Board for Disaster Management (BNPB), the observed volcanic ash reached up to 5,423 m, in the eruption on 29 November. The authorities strictly prohibit entry or any activity within 2 km radius from the center of the volcano.
  • Meanwhile, Indonesian authorities issued an Alert Level 3 (out of 4) for Merapi Volcano (Java Island), due to an increase in the volcanic activity. About 2,318 people are sheltered in evacuation points across regencies in central Java. 
  • According to the Darwin Volcanic Ash Advisory Centre (VAAC), as of 30 November, a red aviation color code has been issued for Lewotolo.
Detailed event map. European Union, 2021. 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. Latest Lewotolo report has been published on 02 Dec 2020 07:43.
According to PVMBG continuous tremor at Lewotolo began to be recorded at 1943 on 26 November, and a series of volcanic earthquakes began at 1947. A new eruption started at 0557 on 27 November, producing dense blackish gray ash plumes that rose 500 m above the summit and drifted W. Incandescence at the summit was visible, and the emissions turned white around 0630. Seismicity slightly decreased after the eruption, though continuous tremor persisted for a period of time. Dense white plumes rose as high as 400 m and nighttime incandescence was noted during 27-28 November. During the morning of 29 November seismicity again increased, characterized by six deep volcanic earthquakes; continuous tremor appeared around 0930. At 0945 a 10-minute eruption sent dense gray-to-black ash plumes 4 km above the summit that drifted W and NW at lower heights and SE and E near the top of the plume. Ashfall was reported in several surrounding villages and video posted on social media showed tephra falling on roofs in residential areas. According to BNPB, Badan Penanggulangan Bencana Daerah (BPBD) evacuated almost 4,500 residents from 26 villages to seven evacuation centers. At 1300, the Alert Level was raised to 3 (on a scale of 1-4) and the public was warned to stay 4 km away from the summer crater. Ash plumes continued to rise on at least six more occasions, and around 1900 Strombolian activity was visible. A pungent sulfur odor was noted at the Lewotolo observation post. Satellite data showed that a sulfur dioxide plume had drifted over the N half of Australia by 30 November. Ash plumes continued to be emitted during 30 November-1 December, with dense white-and-gray ash plumes rising 700-2,000 m above the summit. Lava flows near the summit were visible and incandescent material traveled down the flanks. Sources: Advanced geospatial Data Management Platform (ADAM) ,Badan Nacional Penanggulangan Bencana (BNPB) ,Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
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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),