M 5.5 in Indonesia on 31 Aug 2026 08:03 UTC

Hazard models

Rapid Impact
Shakemap
Tsunami

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: 5.5M
Depth: 10 Km
Lat/Lon: -8.241 , 120.6119
Event Date: 31 Aug 2026 08:03 UTC
31 Aug 2026 16:03 Local
Exposed Population: 9 thousand in MMI VI
Source: NEIC us7000td2z
Inserted at: 31 Aug 2026 08:18 UTC
INFORM Coping capacity of the alert score: 4.8 (Indonesia)

GDACS Score

For more info on GDACS score click here.
  Earthquake
(Rapid Impact)		 GDACS score
NEIC 0 0
us7000td2z Scaled population (raster) 1.23  
  C1 rapid impact -1.73  
  C2 rapid impact 0.79  
  Country Vulnerability 0  
  INFORM_normalised 0.96  
Maximum expected impact using different data sources.

The green area correspond to areas affected by strong shaking (MMI VI or higher) according to the simulation.


Episode Timeline

IDLevelScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1730254 0 31 Aug 2026 08:03 5.5M, 10km 6.54 120 (in MMI>=VII) N/A 00:15 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.

Rapid Impact

The results presented below are calculated with the ShakeMap open source software (USGS) using only earthquake hypocenter information to provide a rapid estimation of the ground motion and shaking intensity without taking into account any instrumental observations or earthquake source scaling laws.

Exposed population

Intensity Population
<1000 people
23000 people
60000 people

Affected Provinces

Critical infrastructure

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

More information

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