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Moderate mag. 4.0 earthquake - 3.5 Km S of Fagradalsfjall, Iceland, on Friday, Mar 12, 2021 at 12:58 am (GMT +0) -

This quake was likely an aftershock of the 5.1 quake 10.4 Km ESE of Grindavík, Iceland, Mar 10, 2021 3:14 am (GMT +0), which had occurred 1 day 22 hours earlier.
Moderate mag. 4.0 earthquake - 3.5 Km S of Fagradalsfjall, Iceland, on Friday, Mar 12, 2021 at 12:58 am (GMT +0) Moderate mag. 4.0 earthquake - 3.5 Km S of Fagradalsfjall, Iceland, on Friday, Mar 12, 2021 at 12:58 am (GMT +0)

Moderate magnitude 4.0 earthquake at 6 km depth

12 Mar 01:01 UTC: First to report: EMSC after 3 minutes.
12 Mar 01:04: Magnitude recalculated from 3.3 to 3.4.
... [show all] ...
12 Mar 11:26: Hypocenter depth recalculated from 5.4 to 5.9 km (from 3.4 to 3.7 mi).

Earthquake details

Date & timeMar 12, 2021 00:58:40 UTC -
Local time at epicenterFriday, Mar 12, 2021 at 12:58 am (GMT +0)
Depth5.9 km
Epicenter latitude / longitude63.871°N / 22.276°W (Grindavikurbær, Southern Peninsula, Iceland)
Antipode63.871°S / 157.724°E
Shaking intensityWeak shaking
Felt2 reports
Primary data sourceIMO (Icelandic Met Office)
Nearest volcanoFagradalsfjall (3 km / 2 mi)
Nearby towns and cities9 km (5 mi) ENE of Grindavik (pop: 2,860) | Show on map | Quakes nearby
20 km (12 mi) SE of Reykjanesbær (Penisola meridionale) (pop: 2,010) | Show on map | Quakes nearby
27 km (17 mi) SW of Hafnarfjordur (Capital Region) (pop: 26,800) | Show on map | Quakes nearby
30 km (18 mi) SW of Garðabaer (Capital Region) (pop: 11,400) | Show on map | Quakes nearby
32 km (20 mi) SSW of Kopavogur (Capital Region) (pop: 31,700) | Show on map | Quakes nearby
35 km (22 mi) SSW of Reykjavik (Capital Region) (pop: 118,900) | Show on map | Quakes nearby
43 km (27 mi) SW of Mosfellsbaer (Capital Region) (pop: 8,650) | Show on map | Quakes nearby
44 km (27 mi) W of Thorlakshofn (South) (pop: 1,490) | Show on map | Quakes nearby
51 km (32 mi) S of Akranes (West) (pop: 6,610) | Show on map | Quakes nearby
55 km (34 mi) WSW of Hveragerdi (South) (pop: 2,290) | Show on map | Quakes nearby
Weather at epicenter at time of quakeBroken Clouds 1.5°C (35 F), humidity: 86%, wind: 9 m/s (18 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.
4.05.9 km3.5 Km S of Fagradalsfjall, IcelandIMO

User reports for this quake (2)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Reykjanesbaer, Southern Peninsula (18.3 km NW of epicenter) [Map] / Weak shaking (MMI III) (reported through our app)
Reykjavík 105 (35.4 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / 1-2 s (reported through our app)
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