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Strong mag. 5.5 earthquake - Indian Ocean, 87 km southeast of Sinabang, Kabupaten Simeulue, Aceh, Indonesia, on 10 Jul 9:41 am (GMT +7)

Strong mag. 5.5 earthquake - Indian Ocean, 87 km southeast of Sinabang, Kabupaten Simeulue, Aceh, Indonesia, on 10 Jul 9:41 am (GMT +7) Strong mag. 5.5 earthquake - Indian Ocean, 87 km southeast of Sinabang, Kabupaten Simeulue, Aceh, Indonesia, on 10 Jul 9:41 am (GMT +7)

Strong magnitude 5.5 earthquake at 32 km depth

10 Jul 02:50 UTC: First to report: GFZ after 9 minutes.
10 Jul 02:52: Magnitude recalculated from 5.4 to 5.5. Epicenter location corrected by 6.7 km (4.1 mi) towards E.
10 Jul 02:55: Now using data updates from BMKG
10 Jul 03:25: Magnitude recalculated from 5.6 to 5.5. Hypocenter depth recalculated from 40.0 to 32.0 km (from 25 to 19.9 mi).
Update Sat, 10 Jul 2021, 02:57

Significant magnitude 5.6 quake hits 87 km southeast of Sinabang, Indonesia in the morning

5.6 quake 10 Jul 9:41 am (GMT +7)
5.6 quake 10 Jul 9:41 am (GMT +7)
A moderately shallow magnitude 5.6 earthquake was reported in the morning near Sinabang, Kabupaten Simeulue, Aceh, Indonesia.
According to Indonesia's Meteorology, Climatology, and Geophysical Agency, the quake hit on Saturday 10 July 2021 at 9:41 am local time at a moderately shallow depth of 40 km. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
A second report was later issued by France's Réseau National de Surveillance Sismique (RéNaSS), which listed it as a magnitude 5.4 earthquake. Other agencies reporting the same quake include the German Research Centre for Geosciences (GFZ) at magnitude 5.5, and the European-Mediterranean Seismological Centre (EMSC) at magnitude 5.4.
Generally quakes of this magnitude are recorded by more than one agency and the results can vary, with subsequent reports that come in after the first one often showing more accuracy.
Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter.
Weak shaking might have been felt in Sinabang (pop. 15,000) located 87 km from the epicenter, and Singkil (pop. 46,800) 116 km away.
VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.

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Earthquake details

Date & timeJul 10, 2021 02:41:11 UTC
Local time at epicenter10 Jul 9:41 am (GMT +7)
Depth32.0 km
Epicenter latitude / longitude1.85°N / 96.84°E (Indian Ocean, Indonesia)
Antipode1.85°S / 83.16°W
Shaking intensityModerate shaking near epicenter
Felt0 reports
Primary data sourceBMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)
Nearest volcanoSinabung (226 km / 140 mi)
Nearby towns and cities87 km (54 mi) SE of Sinabang (Kabupaten Simeulue) (pop: 15,000) | Show on map | Quakes nearby
116 km (72 mi) WSW of Singkil (pop: 46,800) | Show on map | Quakes nearby
216 km (134 mi) W of Sibolga (pop: 79,700) | Show on map | Quakes nearby
230 km (143 mi) SW of Kabanjahe (pop: 57,200) | Show on map | Quakes nearby
267 km (166 mi) SW of Binjai (pop: 228,800) | Show on map | Quakes nearby
275 km (171 mi) SW of Sunggal (pop: 157,900) | Show on map | Quakes nearby
275 km (171 mi) W of Padangsidempuan (pop: 100,600) | Show on map | Quakes nearby
277 km (172 mi) WSW of Pematangsiantar (pop: 209,600) | Show on map | Quakes nearby
280 km (174 mi) SW of Medan (pop: 1,751,000) | Show on map | Quakes nearby
500 km (310 mi) NW of Padang (pop: 840,400) | Show on map | Quakes nearby
119 km (74 mi) NW of Nias Island (pop: 756,300) | Show on map | Quakes nearby
545 km (338 mi) SW of Penang Island (pop: 860,000) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 27°C (81 F), humidity: 82%, wind: 5 m/s (11 kts) from W
Estimated seismic energy released1.1 x 1013 joules (3.12 gigawatt hours, equivalent to 2682 tons of TNT or 0.2 atomic bombs!) | about seismic energy
Show interactive Map
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
5.532 kmIndonesia: Off West Coast of Northern SumatraBMKG
5.328 kmNorthern Sumatra, IndonesiaGFZ
5.410 kmIndonesia: Near MedanRENASS
5.424 km97 Km SE of Sinabang, IndonesiaUSGS
5.328 kmNorthern Sumatra, IndonesiaGeoAu

User reports for this quake (1)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Leave a comment if you find a particular report interesting or want to add to it.
Flag as inappropriate.
Mark as helpful or interesting.
Send your own user report!
Kresek, West Java (1374.5 km SE of epicenter) [Map] / not felt : Tidak terasa (reported through our app)  


[More info]

Recorded aftershocks, latest first (1 quake)

Date and timeMag
Jul 10, 2021 03:01
1 year 21 weeks ago

10 km
Indian Ocean, 88 km SE of Sinabang, Kabupaten Simeulue, Aceh, IndonesiaMore

Earlier earthquakes in the same area

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