Overall Green Earthquake in Indonesia on 31 Aug 2026 08:03 UTC

GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve awareness, information exchange and coordination in the first phase after major sudden-onset disasters.

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 (Shakemap)		GDACS score
NEIC	0		0
us7000td2z	Scaled population (raster)	0
	C1 shakemap	-1.73
	C2 shakemap	0.79
	Country Vulnerability	0
	INFORM_normalised	0.96
	Score no CC	10

Maximum expected impact using different data sources.

ShakeMap is a product of the USGS Earthquake Hazards Program in conjunction with the regional seismic networks. ShakeMaps provide near-real-time maps of ground motion and shaking intensity following significant earthquakes.

Episode Timeline

ID	Level	Score	Date	Mag, Depth	MMI*	Population**	Tsunami risk***	Delay (hh:mm)	Source
1730254		0	31 Aug 2026 08:03	5.5M, 10km	6.27	N/A (in MMI>=VII)		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.

Exposed population

Intensity	Population
	8700 people
	55000 people

Shakemaps Timeline

Shake id #	episodeid	Lat/Lon	Magnitude	Depth	Max MMI	Date shake (UTC)	Delay (hh:mm)
1	1730254	120.612/-8.241	5.5	10	6.406	31 Aug 2026 08:24	00:21	(new episode)
2	1730254	120.612/-8.241	5.5	10	6.406	31 Aug 2026 10:09	02:05	(upd of #1)
3	1730254	120.612/-8.241	5.5	10	6.387	01 Sep 2026 14:01	1d 05:58	(upd of #2)

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.

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