Information on the earthquake: moderate mag. Earthquake 4.2 – Aegean Sea, 47 km south of Kos, Dodecanese, South Aegean, Greece, on Tuesday, October 5, 2021 at 10:54 a.m. (GMT +3)


Medium-magnitude earthquake 4.2 to 11 km deep

5 October 07:57 UTC: First to report: EMSC after 3 minutes.
Oct 5, 7:58 AM: Depth of the hypocenter recalculated from 2.0 to 0.0 km (from 1.2 to 0 mi). Epicenter location corrected 2.4 km (1.5 mi) towards SSW.
… [show all] …
5 October 08:28: Depth of the hypocenter recalculated from 13.4 to 11.0 km (from 8.3 to 6.8 mi). Epicenter location corrected 2.3 km (1.4 mi) towards S.

Updated Tue Oct 5, 2021, 08:09 AM

Moderate 4.2 magnitude earthquake just reported 45 km southwest of Kos, Greece

Earthquake 4.2 on October 5, 10:54 a.m. (GMT +3)

Earthquake 4.2 on October 5, 10:54 a.m. (GMT +3)

A shallow 4.2 magnitude earthquake was reported in the morning near Kos, Dodecanese, southern Aegean Sea, Greece.
According to the Athens National Observatory (NOA), the earthquake struck on Tuesday, October 5, 2021 at 10:54 a.m. local time at a shallow depth of 13.4 km. Shallow earthquakes are felt more strongly than deep ones because they are closer to the surface. The exact magnitude, epicenter and depth of the quake could be revised in the coming hours or minutes, as seismologists review the data and refine their calculations, or when other agencies release their report.
A second report was later released by the Kandilli Observatory and the Istanbul Earthquake Research Institute (KOERI-RETMC), which classified it as a magnitude 4.0 earthquake. A third agency, the Euro-Mediterranean Seismological Center (EMSC), reported the same magnitude 4.1 earthquake.
Based on preliminary seismic data, the quake should not have caused significant damage, but was likely felt by many as a slight vibration in the epicenter area.
Weak tremors could be felt in Nikia (48 inhabitants) located 8 km from the epicenter, Kardamena (1,900 inhabitants) at 31 km, Kefalos (2,500 inhabitants) at 33 km and Antimacheia (2,300 inhabitants) at 35 km.
Other towns close to the epicenter where the earthquake could have been felt as very weak tremors include Kos (19,200 inhabitants) located 45 km from the epicenter, Kalymnos (12,300 inhabitants) 52 km away, Turgutreis ( 16,500 inhabitants) 58 km to 64 km, Bodrum (39,300 inhabitants) 64 km and Rhodes (56,100 inhabitants) 95 km.

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Earthquake data

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Date and hour : October 5, 2021 07:54:08 AM UTC –
Local time at epicenter: Tuesday, October 5, 2021 10:54 a.m. (GMT +3)
Magnitude: 4.2
Depth: 11.0 km

Latitude / longitude of epicenter: 36.481 ° N / 27.1646 ° E↗ (Aegean Sea, Greece)
Antipode: 36.481 ° S / 152.835 ° W↗
Nearest volcano: Nisyros (13 km / 8 mi)

Nearby towns and villages:
10 km (6 mi) south of Nikia (pop: 48) -> See nearby earthquakes!
34 km (21 mi) south of Kardamena (Dodecanese) (pop: 1,930) -> See nearby earthquakes!
35 km (22 mi) to SSE of Kefalos (pop: 2,530) -> See nearby earthquakes!
47 km (29 mi) SSO of Kos (pop: 19,200) -> Observe the earthquakes nearby!
55 km (34 mi) to SSE of Kalymnos (Dodecanese) (pop: 12,300) -> See nearby earthquakes!
60 km (37 mi) south of Turgutreis (Bodrum, Turkey) (pop: 16,500) -> See earthquakes nearby!
62 km (38 mi) W of Symi (pop: 2350) -> Observe the earthquakes nearby!
66 km (41 mi) SSO of Bodrum (Turkey) (pop: 39,300) -> See nearby earthquakes!
95 km (59 mi) west of Rhodes (pop: 56,100) -> Observe the earthquakes nearby!
347 km (216 mi) ESE of Athens (pop: 664,000) -> Watch the earthquakes nearby!
125 km (78 mi) east of Anaphi Island (pop: 271) -> See nearby earthquakes!
111 km (69 mi) south of Agathonissi Island (pop: 150) -> See nearby earthquakes!
153 km (95 mi) ESE of Schinousa Island (pop: 256) -> See nearby earthquakes!

Weather at the epicenter at the time of the earthquake:
Clear sky 21.8 ° C (71 F), humidity: 64%, wind: 10 m / s (20 kts) from NW

Main data source: NOA (National Observatory of Athens)

Estimated energy released: 1.3 x 1011 joules (35 megawatt hours, equivalent to 30.1 tonnes of TNT) More info

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Data for the same earthquake reported by different agencies

Info: The more agencies report the same earthquake and publish similar data, the more confidence you can have in the data. It normally takes up to a few hours for the seismic parameters to be calculated with near optimum accuracy.

Mag. Depth Site Source
4.2 11 km Greece: 9 km south of Nissiros NDA
4.1 11 km Greece: 13 Km SSE From Nissiros EMSC
4.2 10 km Dodecanese Islands, Greece GFZ

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