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Light mag. 4.0 earthquake - 13 km northwest of Amaliada, Ilia Prefecture, Western Greece, on Friday, Mar 17, 2023 at 3:45 pm (GMT +2) -

Light mag. 4.0 earthquake - 13 km northwest of Amaliada, Ilia Prefecture, Western Greece, on Friday, Mar 17, 2023 at 3:45 pm (GMT +2) Light mag. 4.0 earthquake - 13 km northwest of Amaliada, Ilia Prefecture, Western Greece, on Friday, Mar 17, 2023 at 3:45 pm (GMT +2)

Light magnitude 4.0 earthquake at 21 km depth

17 Mar 13:48 UTC: First to report: RaspberryShake after 2 minutes.
17 Mar 13:49: Now using data updates from NOA
17 Mar 13:53: Hypocenter depth recalculated from 5.0 to 21.3 km (from 3.1 to 13.2 mi). Epicenter location corrected by 3.1 km (1.9 mi) towards ESE.
17 Mar 14:04: Hypocenter depth recalculated from 21.3 to 20.6 km (from 13.2 to 12.8 mi).
Update Fri, 17 Mar 2023, 14:18

Magnitude 4.0 earthquake strikes near Amaliada, Ilia Prefecture, Western Greece, Greece

4.0 quake 17 Mar 3:45 pm (GMT +2)
4.0 quake 17 Mar 3:45 pm (GMT +2)
A magnitude 4.0 earthquake near Amaliada, Ilia Prefecture, Western Greece, Greece, was reported 32 minutes ago by the National Observatory of Athens (NOA), considered the main national agency that monitors seismic activity in Greece. The earthquake occurred at a shallow depth of 20.6 km beneath the epicenter early afternoon on Friday, March 17th, 2023, at 3:45 pm local time. Magnitude and other quake parameters can still change in the coming hours as the agency continues to process seismic data.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 4.1 earthquake. Other agencies reporting the same quake include the German Research Centre for Geosciences (GFZ) at magnitude 4.6, and the citizen-seismograph network of RaspberryShake at magnitude 4.6.
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 Andravida (pop. 3,600) located 2 km from the epicenter, Traganon (pop. 2,400) 2 km away, Lechaina (pop. 3,700) 4 km away, Kavasila (pop. 1,600) 4 km away, Gastouni (pop. 8,100) 7 km away, Vartholomio (pop. 3,100) 9 km away, and Amaliada (pop. 16,800) 13 km away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Pyrgos (pop. 22,400) located 29 km from the epicenter, and Patras (pop. 168,000) 54 km away.

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Earthquake details

Date & timeMar 17, 2023 13:45:42 UTC -
Local time at epicenterFriday, Mar 17, 2023 at 3:45 pm (GMT +2)
Depth20.6 km
Epicenter latitude / longitude37.9042°N / 21.2901°E (Ilia Prefecture, Western Greece, Greece)
Antipode37.904°S / 158.71°W
Shaking intensityWeak shaking
Felt14 reports
Primary data sourceNOA (National Observatory of Athens)
Nearest volcanoSousaki (158 km / 98 mi)
Nearby towns and cities2 km (1 mi) E of Andravida (West Greece) (pop: 3,630) | Show on map | Quakes nearby
13 km (8 mi) NNW of Amaliada (West Greece) (pop: 16,800) | Show on map | Quakes nearby
13 km (8 mi) ESE of Kyllini (West Greece) (pop: 1,080) | Show on map | Quakes nearby
16 km (10 mi) SSW of Varda (West Greece) (pop: 3,310) | Show on map | Quakes nearby
29 km (18 mi) NNW of Pyrgos (Pirgos, West Greece) (pop: 22,400) | Show on map | Quakes nearby
37 km (23 mi) ENE of Zakynthos (Ionische Inseln) (pop: 11,500) | Show on map | Quakes nearby
54 km (34 mi) SW of Patras (West Greece) (pop: 168,000) | Show on map | Quakes nearby
214 km (133 mi) W of Athens (Attica) (pop: 664,000) | Show on map | Quakes nearby
Weather at epicenter at time of quakeFew Clouds 16°C (61 F), humidity: 48%, wind: 10 m/s (19 kts) from NNE
Estimated seismic energy released6.3 x 1010 joules (17.5 megawatt hours, equivalent to 15.1 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.
4.021 kmGreece: 2 Km E From AndravidaNOA
4.334 kmSouthern GreeceRaspberryShake
4.610 kmSouthern GreeceGFZ
4.334 kmSouthern GreeceUSGS


Seismic station: Castrocucco, Italy (CUC/MN network) | Distance from quake: 527 km / 328 mi | Show on map | Station Info
Seismic station Castrocucco, 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. Bandpass filter applied: 0.2-5.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (14)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Leave a comment if you find a particular report interesting or want to add to it.
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Αμαλιάδα / Light shaking (MMI IV) / 20-30 s : Ένιωσα φόβο επειδή έβλεπε ότι διαρκούσε περισσότερο από άλλες φορές αλλά όταν σταματησε ησύχασε  
Zakynthos (42.5 km WSW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 5-10 s
47.5 km W of epicenter [Map] / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s (reported through our app)
Vanato, Zákynthos, Ionian Islands (41.1 km WSW of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
13 km SSE of epicenter [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 10-15 s
Agrinio (80 km N of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / 5-10 s
Pyrgos, Ilia Prefecture, West Greece (28.2 km SSE of epicenter) [Map] / Weak shaking (MMI III) / 5-10 s
Lithakia, Zákynthos, Ionian Islands (42.7 km WSW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 1-2 s (reported through our app)
Ilia greece (23 km SSE of epicenter) [Map] / Weak shaking (MMI III)
αμαλιάδα (18.8 km SE of epicenter) [Map] / Moderate shaking (MMI V) / 2-5 s
Zakynthos / Light shaking (MMI IV) / 2-5 s : Usually you hear an earthquake coming. This time I didn't and I had the feeling that it started straight away with a 'strong' shock  
Zakynthos / Weak shaking (MMI III) / rattling, vibrating / 5-10 s : House shook  
Gastouni / Light shaking (MMI IV) / 10-15 s
Αμαλιάδα / Light shaking (MMI IV) / both vertical and horizontal swinging / 10-15 s

Earlier earthquakes in the same area

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