Moderate mag. 4.5 earthquake - 1.5 Km SE of Fagradalsfjall, Iceland, on Thursday, 4 Mar 2021 8:54 am (GMT +0) -
This quake was likely an aftershock of the 5.7 quake 3.0 Km S of Hella, Iceland, 24 Feb 2021 10:05 am (GMT +0), which had occurred 8 days earlier.
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Moderate magnitude 4.5 earthquake at 7 km depth
4 Mar 09:00 UTC: First to report: GFZ after 6 minutes.
4 Mar 09:05: Now using data updates from IMO
4 Mar 09:14: Magnitude recalculated from 4.2 to 4.5. Hypocenter depth recalculated from 7.3 to 6.7 km (from 4.5 to 4.2 mi). Epicenter location corrected by 1.8 km (1.1 mi) towards SSE.
4 Mar 09:05: Now using data updates from IMO
4 Mar 09:14: Magnitude recalculated from 4.2 to 4.5. Hypocenter depth recalculated from 7.3 to 6.7 km (from 4.5 to 4.2 mi). Epicenter location corrected by 1.8 km (1.1 mi) towards SSE.
Date & time: 4 Mar 2021 08:54:07 UTC -
Local time at epicenter: Thursday, 4 Mar 2021 8:54 am (GMT +0)
Magnitude: 4.5
Depth: 6.7 km
Epicenter latitude / longitude: 63.891°N / 22.256°W
(Hafnarfjarðarkaupstaður, Capital Region, Iceland)Nearest volcano: Krísuvík (9 km / 6 mi)
Nearby towns and cities:
11 km (7 mi) NE of Grindavik (Southern Peninsula) (pop: 2,860) --> See nearby quakes!
19 km (12 mi) SE of Reykjanesbaer (Southern Peninsula) (pop: 2,010) --> See nearby quakes!
25 km (16 mi) SW of Hafnarfjordur (pop: 26,800) --> See nearby quakes!
27 km (17 mi) SW of Garðabaer (pop: 11,400) --> See nearby quakes!
30 km (18 mi) SW of Kopavogur (pop: 31,700) --> See nearby quakes!
32 km (20 mi) SSW of Reykjavik (pop: 118,900) --> See nearby quakes!
41 km (25 mi) SW of Mosfellsbaer (pop: 8,650) --> See nearby quakes!
43 km (27 mi) W of Thorlakshofn (South) (pop: 1,490) --> See nearby quakes!
49 km (30 mi) S of Akranes (West) (pop: 6,610) --> See nearby quakes!
54 km (33 mi) WSW of Hveragerdi (South) (pop: 2,290) --> See nearby quakes!
Weather at epicenter at time of quake:
Broken Clouds
3°C (37 F), humidity: 100%, wind: 7 m/s (14 kts) from SE
Primary data source: IMO (Icelandic Met Office)Broken Clouds
3°C (37 F), humidity: 100%, wind: 7 m/s (14 kts) from SEEstimated released energy: 3.5 x 1011 joules (98.6 megawatt hours, equivalent to 84.8 tons of TNT) More info
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.
| Magnitude | Depth | Location | Source |
| 4.5 | 6.7 km | 1.5 Km SE of Fagradalsfjall, Iceland | IMO |
| 4.6 | 10 km | Iceland | GFZ |
| 4.7 | 10 km | 9 Km SSW of Hafnarfjörður, Iceland | USGS |
| 4.7 | 10 km | ICELAND | EMSC |
User reports for this quake (69)
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Reykjavik / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s : I’m on the 7. floor in 12 story building. I feel swaying sideways most times but sometimes back and forth. Nothing falling of walls etc. | One user found this interesting.
Hátún 4 105 Reykjavík (32.8 km NNE of epicenter) [Map] / Moderate shaking (MMI V) / rattling, vibrating
32.9 km NE of epicenter [Map] / Moderate shaking (MMI V) / 2-5 s
reykjavik (32.4 km NNE of epicenter) [Map] / Moderate shaking (MMI V) / 2-5 s
Kópavogur (29.6 km NNE of epicenter) [Map] / Moderate shaking (MMI V) (reported through our app)
9.5 km WSW of epicenter [Map] / Moderate shaking (MMI V) (reported through our app)
17.2 km WNW of epicenter [Map] / Light shaking (MMI IV) (reported through our app)
17.9 km WNW of epicenter [Map] / Strong shaking (MMI VI) / rattling, vibrating / 2-5 s (reported through our app)
17.3 km WNW of epicenter [Map] / Moderate shaking (MMI V) / 2-5 s
Hátún 4 105 Reykjavík (32.8 km NNE of epicenter) [Map] / Moderate shaking (MMI V) / rattling, vibrating
10.6 km WSW of epicenter [Map] / Weak shaking (MMI III) / 1-2 s (reported through our app)
18.7 km NW of epicenter [Map] / Moderate shaking (MMI V) (reported through our app)
11.9 km NNW of epicenter [Map] / Weak shaking (MMI III) / 1-2 s (reported through our app)
28.1 km NNE of epicenter [Map] / Light shaking (MMI IV)
82 km E of epicenter [Map] / Weak shaking (MMI III) (reported through our app)
25.5 km NE of epicenter [Map] / Light shaking (MMI IV) (reported through our app)
15.9 km WNW of epicenter [Map] / Strong shaking (MMI VI) / 5-10 s (reported through our app)
11.4 km NNW of epicenter [Map] / Light shaking (MMI IV) (reported through our app)
53 km ENE of epicenter [Map] / Weak shaking (MMI III) (reported through our app)
19 km NW of epicenter [Map] / Light shaking (MMI IV) / 2-5 s : Wake me up, quite rapid and long shake
27 km NW of epicenter [Map] / Moderate shaking (MMI V) (reported through our app)
Reykjavik 109 (31.1 km NE of epicenter) [Map] / Moderate shaking (MMI V) / both vertical and horizontal swinging / 2-5 s (reported through our app)
26.3 km NE of epicenter [Map] / Light shaking (MMI IV) / 1-2 s (reported through our app)
Grafarvogi (35 km NE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s (reported through our app)
29.6 km NE of epicenter [Map] / Light shaking (MMI IV) / 2-5 s (reported through our app)
Reykjavik (32.2 km NNE of epicenter) [Map] / Light shaking (MMI IV) / 2-5 s (reported through our app)
27.8 km NE of epicenter [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s
31.6 km NNE of epicenter [Map] / Light shaking (MMI IV)
22.3 km NE of epicenter [Map] / Very strong shaking (MMI VII) (reported through our app)
25 km NE of epicenter [Map] / Weak shaking (MMI III) (reported through our app)
18.3 km WNW of epicenter [Map] / Very strong shaking (MMI VII) (reported through our app)
32.9 km NNE of epicenter [Map] / Very weak shaking (MMI II) / rattling, vibrating (reported through our app)
10.9 km WSW of epicenter [Map] / Light shaking (MMI IV) (reported through our app)
Reykjavík (31.8 km NE of epicenter) [Map] / Moderate shaking (MMI V) (reported through our app)
31.9 km NNE of epicenter [Map] / not felt / 1-2 s (reported through our app)
Reykjavik (32.6 km NE of epicenter) [Map] / Strong shaking (MMI VI) / rattling, vibrating
31.7 km NNE of epicenter [Map] / Light shaking (MMI IV) / 2-5 s (reported through our app)
18.2 km WNW of epicenter [Map] / Moderate shaking (MMI V) (reported through our app)
18 km NW of epicenter [Map] / Moderate shaking (MMI V) / 2-5 s (reported through our app)
33.3 km NE of epicenter [Map] / Weak shaking (MMI III) (reported through our app)
32.9 km NE of epicenter [Map] / Moderate shaking (MMI V) / 2-5 s
26.1 km NE of epicenter [Map] / Light shaking (MMI IV) (reported through our app)
19 km NW of epicenter [Map] / Moderate shaking (MMI V) (reported through our app)
18.3 km WNW of epicenter [Map] / Moderate shaking (MMI V) (reported through our app)
33.4 km NE of epicenter [Map] / Weak shaking (MMI III)
21.6 km WNW of epicenter [Map] / Light shaking (MMI IV) (reported through our app)
Reykjavik, Hlemmur area / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
Vogar / Weak shaking (MMI III) / rattling, vibrating / very short
Reykjavík 105 - ground floor / Moderate shaking (MMI V) / 2-5 s : The rumbling noise woke me up, and I’m a heavy sleeper. Then bed and house started vibrating
Austurkór Kópavogur / Weak shaking (MMI III) / both vertical and horizontal swinging / 1-2 s
Reykjavik 101 / Light shaking (MMI IV)
reykjavik / Light shaking (MMI IV)
Reykjavik / Moderate shaking (MMI V) / rattling, vibrating / 5-10 s : I was sitting in school with my friends and the building started shaking
Njarðvík / Weak shaking (MMI III) / horizontal (sideways) swinging / 1-2 s
Keflavik / Light shaking (MMI IV) / 1-2 s
vesturbær / Weak shaking (MMI III) / rattling, vibrating / 1-2 s
Reykjavík / Moderate shaking (MMI V)
Reykjavik, Hamraborg / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Woke up from the vibrations
108 Reykjavik / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
Grindavík / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
Reykjavik, Korngardar 3 / Weak shaking (MMI III)
Innri-Njarðvík / Weak shaking (MMI III) / rattling, vibrating / 1-2 s
Njarðvík / Weak shaking (MMI III) / horizontal (sideways) swinging / 1-2 s
Hlemmur / Moderate shaking (MMI V) / 2-5 s
Gardur / Moderate shaking (MMI V)
Njarðvík / Light shaking (MMI IV)
Njarðvík / Light shaking (MMI IV)
Reykjavík / Light shaking (MMI IV)
Mosfellsbær / Weak shaking (MMI III) / rattling, vibrating / 2-5 s
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