Quake Info: Moderate Mag. 5.0 Earthquake

The United States Geological Survey reported a magnitude 5.0 quake in Antigua & Barbuda near Saint John, only 20 minutes ago. The earthquake hit early afternoon on Wednesday, September 28th, 2022, at 3:48 pm local time at a shallow depth of 27.8 km. 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.
Our monitoring service identified a second report from France’s Réseau National de Surveillance Sismique (RéNaSS) which listed the quake at magnitude 4.8. Other agencies reporting the same quake include the citizen-seismograph network of RaspberryShake at magnitude 4.8, the German Research Centre for Geosciences (GFZ) at magnitude 4.8, and the European-Mediterranean Seismological Centre (EMSC) at magnitude 5.0.
Generally quakes of this magnitude are recorded by more than one agency and the results can vary, with subsequent reports that come in after the first one often showing more accuracy.
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 Codrington (pop. 1,300) located 50 km from the epicenter, Codrington (pop. 1,300) 50 km away, Piggotts (pop. 1,900) 92 km away, Saint John (pop. 24,200) 94 km away, and All Saints (pop. 2,500) 97 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.

If you were or still are in this area during the quake help others with your feedback and report it here.

Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 10 km² (=4 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 5 km (3 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).

Sep 29, 2022 00:36 28 minutes ago	3.9 10 km	North Atlantic Ocean, 88 km N of Saint John, Antigua & Barbuda	More
Sep 28, 2022 21:37 3 hours ago	4.2 25 km	North Atlantic Ocean, 87 km N of Saint John, Antigua & Barbuda	More
Sep 28, 2022 21:34 3 hours ago	4.3 30 km	North Atlantic Ocean, 88 km N of Saint John, Antigua & Barbuda	More

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