M 5.1 in Solomon Islands on 20 Oct 2021 06:38 UTC
EQ parameters

Event summary

This earthquake is expected to have a low humanitarian impact based on the magnitude and the affected population and their vulnerability.

Earthquake Magnitude: 5.1M
Depth: 205.22 Km
Lat/Lon: -11.8553 , 166.8466
Event Date: 20 Oct 2021 06:38 UTC
20 Oct 2021 17:38 Local
Exposed Population:
4 thousand in 100km
Source: NEIC us6000fw20
Inserted at: 20 Oct 2021 06:56 UTC
INFORM Coping capacity of the alert score: 6.6 (Solomon Is.)


For more info on GDACS alert score click here.
  Earthquake GDACS score
NEIC 0 0
us6000fw20 Scaled population (vector) 3.85  
  C1 earthquake 1  
  C2 earthquake 0  
  Country Vulnerability 0.44  
  INFORM_normalised 1.18  
Maximum expected impact using different data sources.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1403411 0 20 Oct 2021 06:38 5.1M, 205.22km N/A 4 thousand (in 100km) 00:18 NEIC
The episode that generated the alert; the next major evaluations beyond 12 hours will not trigger additional alerts.
The episode that has the last updated information.
* The max MMI detected for sources having shakemaps;
** The population detected in MMI>=7 for episode with shakemap or in a 100km radius;
*** The tsunami max height.

Exposed population

The earthquake happened in Solomon Islands , of Solomon Is. (population 366,000) . The nearest places are Peu, Vanikoro Is, Oeili, Numbuko, Lale, Nama, Arambu, Buma, Vana, and Vanikoro.

Radius Population
100 km 3800 people
75 km 2800 people
50 km 2000 people
20 km <1000 people
10 km no people
5 km no people
2 km no people

Affected Provinces

Region Province Country Population
Solomon Is. Solomon Islands 360000 people

Affected populated places

Name Region Province Country City class Population Distance
Peu Solomon Islands Village - 19 km
Vanikoro Is Solomon Islands Village - 20 km
Oeili Solomon Islands Village - 22 km
Numbuko Solomon Islands Village - 25 km
Lale Solomon Islands Village - 26 km
Nama Solomon Islands Village - 27 km
Arambu Solomon Islands Village - 27 km
Buma Solomon Islands Village - 28 km
Vana Solomon Islands Village - 29 km
Vanikoro Solomon Islands Village - 30 km

see full list

Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.


Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft) Distance
Santa Cruz SCZ unknown 0 26 km


Name LOCODE Country Distance
Peu Soloman Islands 21 km

More information

For a full list of available products related to this event, please refer to the GDACS Resources page.