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Home›Sumatra›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)

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)

By William Hughey
April 27, 2021
0
0


Mod moderate.  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.

I felt this earthquake

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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!

Weather at the epicenter at the time of the earthquake:
Clouds covered 28.9 ° C (84 F), humidity: 69%, wind: 2 m / s (5 kts) from the NE

Main 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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