Light mag. 4.7 earthquake - Indian Ocean, 39 km west of Sibolga, North Sumatra, Indonesia, on Tuesday, Aug 24, 2021 3:59 am (GMT +7) -

Light mag. 4.7 earthquake - Indian Ocean, 39 km west of Sibolga, North Sumatra, Indonesia, on Tuesday, Aug 24, 2021 3:59 am (GMT +7)

Light magnitude 4.7 earthquake at 53 km depth

23 Aug 21:05 UTC: First to report: BMKG after 5 minutes.
23 Aug 21:15: Hypocenter depth recalculated from 49.0 to 53.0 km (from 30 to 33 mi). Epicenter location corrected by 2.5 km (1.5 mi) towards NNE.
Update Mon, 23 Aug 2021, 21:09
Moderate 4.7 quake hits near Sibolga, North Sumatra, Indonesia
4.7 quake 24 Aug 3:59 am (GMT +7)
4.7 quake 24 Aug 3:59 am (GMT +7)
An earthquake of magnitude 4.7 occurred only 9 minutes ago 40 km west of Sibolga, Indonesia, Indonesia's Meteorology, Climatology, and Geophysical Agency reported.
The quake hit at a moderately shallow depth of 49 km beneath the epicenter near Sibolga, North Sumatra, Indonesia, early morning on Tuesday 24 August 2021 at 3:59 am local time. 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 the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 4.7 earthquake as well.
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 Sibolga (pop. 79,700) located 40 km from the epicenter.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Singkil (pop. 46,800) located 89 km from the epicenter, and Padangsidempuan (pop. 100,600) 105 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.

Download the Volcanoes & Earthquakes app and get one of the fastest seismic alerts online:
Android | iOS

Earthquake data

Date & time: Aug 23, 2021 20:59:54 UTC -
Local time at epicenter: Tuesday, Aug 24, 2021 3:59 am (GMT +7)
Magnitude: 4.7
Depth: 53.0 km
Epicenter latitude / longitude: 1.83°N / 98.44°E (Indian Ocean, Indonesia)
Antipode: 1.83°S / 81.56°W
Nearest volcano: Toba (74 km / 46 mi)
Nearby towns and cities:
39 km (24 mi) WNW of Sibolga (pop: 79,700) --> See nearby quakes!
89 km (55 mi) SE of Singkil (pop: 46,800) --> See nearby quakes!
105 km (65 mi) WNW of Padangsidempuan (pop: 100,600) --> See nearby quakes!
141 km (88 mi) S of Kabanjahe (pop: 57,200) --> See nearby quakes!
144 km (89 mi) SSW of Pematangsiantar (pop: 209,600) --> See nearby quakes!
158 km (98 mi) W of Rantauprapat (pop: 103,000) --> See nearby quakes!
183 km (114 mi) SW of Kisaran (pop: 129,900) --> See nearby quakes!
197 km (122 mi) S of metan (pop: 1,751,000) --> See nearby quakes!
375 km (233 mi) NW of Padang (pop: 840,400) --> See nearby quakes!
389 km (242 mi) WSW of Kuala Lumpur (Malaysia) (pop: 1,454,000) --> See nearby quakes!
121 km (75 mi) NE of Nias Island (pop: 756,300) --> See nearby quakes!
Weather at epicenter at time of quake:
Light Rain 25.5°C (78 F), humidity: 81%, wind: 1 m/s (3 kts) from NNW
Primary data source: BMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)
Estimated released energy: 7.1 x 1011 joules (197 megawatt hours, equivalent to 169 tons of TNT) | about seismic energy
Show interactive Map
[smaller] [bigger]
If you felt this quake (or if you were near the epicenter), please share your experience and submit a short "I felt it" report! Other users would love to hear about it!
If you did NOT feel the quake although you were in the area, please report it! Your contribution is valuable to earthquake science, seismic hazard analysis and mitigation efforts. You can use your device location or the map to indicate where you were during the earthquake. Thank you!

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.
Mag.DepthLocationSource
4.753 kmNorthern Sumatra, IndonesiaBMKG
4.780 kmNORTHERN SUMATRA, INDONESIAEMSC
4.683 kmNorthern Sumatra, IndonesiaGFZ
4.782 km37 Km WNW of Sibolga, IndonesiaUSGS

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.
Volcanoes & Earthquakes - new app for Android

Earlier earthquakes in the same area

Try our free app!
Volcanoes & Earthquakes - new app for Android
Android | iOS version
Why is there advertising on this site?
Support us - Help us upgrade our services!
We truly love working to bring you the latest volcano and earthquake data from around the world. Maintaining our website and our free apps does require, however, considerable time and resources.
We need financing to increase hard- and software capacity as well as support our editor team. We're aiming to achieve uninterrupted service wherever an earthquake or volcano eruption unfolds, and your donations can make it happen! Every donation will be highly appreciated. If you find the information useful and would like to support our team in integrating further features, write great content, and in upgrading our soft- and hardware, please make a donation (PayPal or Online credit card payment).

Planned features:
  • Improved multilanguage support
  • Tsunami alerts
  • Faster responsiveness
Thanks to your past donations, these features have been added recently:
  • Earthquake archive from 1900 onwards
  • Detailed quake stats
  • Additional seismic data sources
Download and Upgrade the Volcanoes & Earthquakes app to get one of the fastest seismic and volcano alerts online:
Android | IOS
Thank you!
Copyrights: VolcanoDiscovery and other sources as noted.
Use of material: Most texts and images, in particular photographs, on this website are protected by copyright. Further reproduction and use of without authorization is usually not consented. If you are not sure or need licensing rights for photographs, for example for publications and commercial use, please contact us.