Moderate mag. 5.6 earthquake - Indian Ocean, 114 km northwest of Sinabang, Kabupaten Simeulue, Aceh, Indonesia, on Wednesday, Sep 15, 2021 at 3:13 am (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.

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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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