Terremoto moderato mag. 5.6 - Indian Ocean, 114 km a nord ovest da Sinabang, Indonesia, mercoledì, 15 set 2021 03:13 (GMT +7) -

An earthquake of magnitude 5.4 occurred early morning on Wednesday, September 15th, 2021, at 3:13 am local time near Sinabang, Kabupaten Simeulue, Aceh, Indonesia, as reported by Indonesia's Meteorology, Climatology, and Geophysical Agency.
According to preliminary data, the quake was located at a shallow depth of 10 km. Shallow earthquakes are felt more strongly than deeper ones as they are closer to the surface. 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 German Research Centre for Geosciences (GFZ), which listed it as a magnitude 5.4 earthquake as well. A third agency, the European-Mediterranean Seismological Centre (EMSC), reported the same quake at magnitude 5.4.
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 130 km from the epicenter.
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.

Data & ora: 14 Sep 2021 20:13:57 UTC -
Ora locale a epicentro: mercoledì, 15 set 2021 03:13 (GMT +7)
Magnitudine: 5.6
Prof.: 48.0 km
Epicentro latitudine / longitudine: 2.91°N / 95.45°E (Indian Ocean, Indonesia)
Antipode: 2.91°S / 84.55°W
Vulcano più vicino: Peuet Sague (223 km / 139 mi)
Nearby towns and cities:
114 km ONO da Sinabang (Kabupaten Simeulue) (pop: 15,000) --> Vedi sismi vicini
156 km SSO da Meulaboh (Kabupaten Aceh Barat) (pop: 35,100) --> Vedi sismi vicini
269 km ONO da Singkil (pop: 46,800) --> Vedi sismi vicini
273 km SSO da Reuleuet (pop: 40,400) --> Vedi sismi vicini
293 km S da Banda Aceh (pop: 250,800) --> Vedi sismi vicini
315 km SO da Lhokseumawe (pop: 89,000) --> Vedi sismi vicini
346 km OSO da Binjai (pop: 228,800) --> Vedi sismi vicini
359 km OSO da Sunggal (pop: 157,900) --> Vedi sismi vicini
365 km OSO da Medan (pop: 1,751,000) --> Vedi sismi vicini
387 km OSO da Percut (pop: 311,100) --> Vedi sismi vicini
312 km NO da Nias Island (pop: 756,300) --> Vedi sismi vicini
Fonte dati primaria: BMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)
Stima dell'energia sismica liberata: 1.6 x 10¹³ joules (4.4 GWh, equivalent to 3788 tons of TNT o 0.2 atomic bombs!) | about seismic energy

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Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 40 km² (=15 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 11 km (7 mi).
Aftershocks typically occur during the days and weeks following the quake at or near the same fault, at distances of up to approx. two times the length of the rupture zone.
The often broadly linear arrangement of aftershock epicenters encompasses the rupture zone of the main shock (check on the map below to verify).

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