Info on the earthquake: mag. Earthquake 4.2 – Indian Ocean, 159 km southwest of Nias Island, North Sumatra, Indonesia, April 27 at 7:38 a.m. (GMT +6)
Moderate magnitude earthquake 4.2 to 10 km deep
April 27 01:50 UTC: First to report: BMKG after 11 minutes.
27 Apr 03:25: Location of the epicenter corrected by 6 km (3.7 mi) towards SSE.
27 Apr 03:35: Magnitude recalculated from 4.0 to 4.2. Epicenter location corrected 33 km (20 mi) towards SSE.
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Date and time: April 27, 2021 01:38:48 UTC –
Local time at epicenter: April 27, 7:38 a.m. (GMT +6)
Magnitude: 4.2
Depth: 10.0 km
Epicenter latitude / longitude: 0.04 ° S / 96.79 ° E 
(Indian Ocean, Indonesia)
Neighboring towns:
282 km (175 mi) SSO of Singkil (pop: 46,800) -> See nearby earthquakes!
284 km (176 mi) south of Sinabang (Kabupaten Simeulue) (pop: 15,000) -> See earthquakes nearby!
297 km (185 mi) SW of Sibolga (pop: 79700) -> See nearby earthquakes!
318 km (198 mi) west of Padangsidempuan (pop: 100,600) -> See nearby earthquakes!
376 km (234 mi) west of Pariaman (pop: 92,200) -> See nearby earthquakes!
399 km (248 mi) west of Bukittinggi (pop: 98700) -> See nearby earthquakes!
409 km (254 mi) west of Padang (pop: 840,400) -> See nearby earthquakes!
414 km (257 mi) SW of Rantauprapat (pop: 103,000) -> See nearby earthquakes!
260 mi (419 km) SW of Pematangsiantar (pop: 209600) -> See nearby earthquakes!
454 km (282 mi) SSW of Medan (pop: 1,751,000) -> See nearby earthquakes!
159 km (99 mi) SW of Nias Island (pop: 756,300) -> See nearby earthquakes!
Clouds covered
28.9 ° C (84 F), humidity: 69%, wind: 2 m / s (5 kts) from the NEMain data source: BMKG (Meteorological, Climatological and Geophysical Agency of Indonesia)
Estimated energy released: 1.3 x 1011 joules (35 megawatt hours, or 30.1 tonnes of TNT) More info
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Data for the same earthquake reported by different agencies
Info: The more agencies report the same earthquake and publish similar data, the more confidence you can have in the data. It normally takes up to a few hours for the earthquake parameters to be calculated with near optimum accuracy.
| Magnitude | Depth | Location | Source |
| 4.2 | 10 km | South West Sumatra, Indonesia | BMKG |
| 4.0 | 10 km | NIAS REGION, INDONESIA | EMSC |
User reports for this earthquake (1)
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BUTTERWORTH / Slight shaking (MMI IV) / single lateral shaking / 1-2 s
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