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Moderate mag. 3.9 earthquake - 2.4 Km S of Fagradalsfjall, Iceland, on Friday, Mar 12, 2021 at 3:51 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 2 days earlier.
Moderate mag. 3.9 earthquake - 2.4 Km S of Fagradalsfjall, Iceland, on Friday, Mar 12, 2021 at 3:51 am (GMT +0) Moderate mag. 3.9 earthquake - 2.4 Km S of Fagradalsfjall, Iceland, on Friday, Mar 12, 2021 at 3:51 am (GMT +0)

Moderate magnitude 3.9 earthquake at 5 km depth

12 Mar 03:56 UTC: First to report: EMSC after 4 minutes.
12 Mar 03:57: Now using data updates from IMO
... [show all] ...
12 Mar 17:26: Hypocenter depth recalculated from 4.0 to 4.5 km (from 2.5 to 2.8 mi).

Earthquake details

Date & timeMar 12, 2021 03:51:58 UTC
Local time at epicenterFriday, Mar 12, 2021 at 3:51 am (GMT +0)
Depth4.5 km
Epicenter latitude / longitude63.881°N / 22.275°W (Grindavikurbær, Southern Peninsula, Iceland)
Antipode63.881°S / 157.725°E
Shaking intensityLight shaking
Felt1 report
Primary data sourceIMO (Icelandic Met Office)
Nearest volcanoFagradalsfjall (2 km / 1 mi)
Nearby towns and cities9 km (6 mi) ENE of Grindavik (pop: 2,860) | Show on map | Quakes nearby
19 km (12 mi) SE of Reykjanesbær (Penisola meridionale) (pop: 2,010) | Show on map | Quakes nearby
26 km (16 mi) SW of Hafnarfjordur (Capital Region) (pop: 26,800) | Show on map | Quakes nearby
29 km (18 mi) SW of Garðabaer (Capital Region) (pop: 11,400) | Show on map | Quakes nearby
31 km (19 mi) SW of Kopavogur (Capital Region) (pop: 31,700) | Show on map | Quakes nearby
34 km (21 mi) SSW of Reykjavik (Capital Region) (pop: 118,900) | Show on map | Quakes nearby
42 km (26 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
50 km (31 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: 11 m/s (21 kts) from NNE
Estimated seismic energy released4.5 x 1010 joules (12.4 megawatt hours, equivalent to 10.7 tons of TNT) | about seismic energy
Show interactive Map
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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.
3.94.5 km2.4 Km S of Fagradalsfjall, IcelandIMO


Seismic station: Borgarfjordur, Asbjarnarstadir, Iceland (BORG/II network) | Distance from quake: 107 km / 66 mi | Show on map | Station Info
Seismic station Borgarfjordur, Asbjarnarstadir, Iceland: 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 (1)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Kopavogur, Capital Region (31.6 km NNE of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake

Earlier earthquakes in the same area

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