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Weak mag. 3.9 earthquake - 34 km east of Skikda, Algeria, on Friday, Sep 23, 2022 at 5:22 pm (GMT +1) -

Weak mag. 3.9 earthquake - 34 km east of Skikda, Algeria, on Friday, Sep 23, 2022 at 5:22 pm (GMT +1) Weak mag. 3.9 earthquake - 34 km east of Skikda, Algeria, on Friday, Sep 23, 2022 at 5:22 pm (GMT +1)

Weak magnitude 3.9 earthquake at 72 km depth

23 Sep 16:27 UTC: First to report: EMSC after 4 minutes.
23 Sep 16:39: Magnitude recalculated from 4.1 to 3.9. Hypocenter depth recalculated from 5.0 to 72.0 km (from 3.1 to 45 mi). Epicenter location corrected by 6.3 km (3.9 mi) towards WSW.

Earthquake details

Date & timeSep 23, 2022 16:22:54 UTC -
Local time at epicenterFriday, Sep 23, 2022 at 5:22 pm (GMT +1)
StatusConfirmed
Magnitude3.9
Depth72.0 km
Epicenter latitude / longitude36.77°N / 7.27°E (Skikda, Algeria)
Antipode36.77°S / 172.73°W
Shaking intensityWeak shaking
Felt8 reports
Primary data sourceEMSC (European-Mediterranean Seismological Centre)
Nearby towns and cities15 km (9 mi) ENE of Azzaba (pop: 75,300) | Show on map | Quakes nearby
18 km (11 mi) WSW of Berrahal (Annaba) (pop: 19,300) | Show on map | Quakes nearby
33 km (21 mi) NNW of Héliopolis (Guelma) (pop: 40,100) | Show on map | Quakes nearby
34 km (21 mi) ESE of Skikda (pop: 162,700) | Show on map | Quakes nearby
42 km (26 mi) W of El Hadjar (Annaba) (pop: 46,700) | Show on map | Quakes nearby
44 km (27 mi) WNW of Drean (Annaba) (pop: 55,100) | Show on map | Quakes nearby
74 km (46 mi) NE of Constantine (pop: 450,100) | Show on map | Quakes nearby
373 km (232 mi) E of Algiers (Alger) (pop: 1,977,700) | Show on map | Quakes nearby
Weather at epicenter at time of quakeBroken Clouds 23.9°C (75 F), humidity: 50%, wind: 3 m/s (6 kts) from N
Estimated seismic energy released4.5 x 1010 joules (12.4 megawatt hours, equivalent to 10.7 tons of TNT) | about seismic energy
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag.DepthLocationSource
3.972 kmNORTHERN ALGERIAEMSC
3.972 kmNorthern AlgeriaRaspberryShake

Seismograms

Seismic station: Villasalto, Italy (VSL/MN network) | Distance from quake: 355 km / 220 mi | Show on map | Station Info
Seismic station Villasalto, Italy: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (10)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Abbasanta, Provincia di Oristano, Sardinien (395.8 km NNE of epicenter) [Map] / not felt : NON PERCEPITO  
Guelma (39.5 km SSE of epicenter) [Map] / Weak shaking (MMI III) / both vertical and horizontal swinging / 5-10 s
Calama (37.8 km SSE of epicenter) [Map] / Weak shaking (MMI III) / vibration and rolling / 5-10 s : I was lying in bed and everything started shaking + sound of earthquake  
Jijel (134 km W of epicenter) [Map] / not felt : Non ressenti chez café Niboucha près jardin ex-église.  
Guelma (37.4 km SSE of epicenter) [Map] / Weak shaking (MMI III) / vertical swinging (up and down) / 2-5 s : Laying down  
Calama (37.5 km SSE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s
Guelma (37.3 km SSE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / very short : Not very powerfull I think  
Calama (37.8 km SSE of epicenter) [Map] / Weak shaking (MMI III) / vibration and rolling / 5-10 s : I was lying in bed and everything started shaking + sound of earthquake  
Guelma / Weak shaking (MMI III) / single lateral shake / 2-5 s
Guelma / Very weak shaking (MMI II) / 2-5 s

Earlier earthquakes in the same area

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