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

The earthquake happened in Indonesia ,of Nusa Tenggara Timur (population 3,515,623) . The alertlevel for this event is GREEN

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

Region Province	Country	Population
Nusa Tenggara Timur	Indonesia	7900 people
Nusa Tenggara Timur	Indonesia	59000 people
Nusa Tenggara Timur	Indonesia	1 million people
Sulawesi Selatan	Indonesia	no people
Nusa Tenggara Timur	Indonesia	530000 people
Sulawesi Selatan	Indonesia	12000 people
Nusa Tenggara Barat	Indonesia	19000 people

Critical infrastructure

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

Airports

Name	IATA Code	Elevation (m)	Usage	Runway type	IFR	Runway Length (ft)	Distance
Satartacik		1079	Civ.	Paved	No	4200	42 km
Bajawa	BJW	unknown				0	72 km
Komodo		20				0	84 km
H Hasan Aroeboesman		15				0	134 km
Waingapu	WGP	12	Civ.	Paved	No	5000	162 km
Tambolaka	TMC	49				0	198 km

Ports

Name	LOCODE	Country	Distance
Labuhanbajo		Indonesia	85 km
Ende		Indonesia	132 km
Maumere	IDMOF	Indonesia	180 km

More information

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

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