Moderate magnitude 5.0 earthquake at 136 km depth

24 Feb 23:52 UTC: First to report: GFZ after 15 minutes.

Update Wed, 24 Feb 2021, 23:57

Magnitude 5.0 earthquake strikes near Dededo Village, Dededo, Guam

5.0 quake 25 Feb 9:37 am (GMT +10)

5.0 quake 25 Feb 9:37 am (GMT +10)

An earthquake of magnitude 5.0 occurred in the morning on Thursday 25 February 2021 at 9:37 am local time near Dededo Village, Dededo, Guam, as reported by the German Research Centre for Geosciences (GFZ).
According to preliminary data, the quake was located at an intermediate depth of 136 km. The strength of the earthquake may have been tempered by its relative great depth below the surface, which makes it feel weaker in absolute terms. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
A second report was later issued by the United States Geological Survey, which listed it as a magnitude 5.1 earthquake. A third agency, the European-Mediterranean Seismological Centre (EMSC), reported the same quake at magnitude 5.1.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Dededo Village (pop. 44,900) located 33 km from the epicenter, Tamuning-Tumon-Harmon Village (pop. 19,700) 37 km away, Hagåtña (pop. 1,100) 39 km away, and Talofofo Village (pop. 3,200) 52 km away.
VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you’re in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.

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Earthquake data:

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Date & time: 24 Feb 2021 23:37:25 UTC –
Local time at epicenter: Thursday, 25 Feb 2021 9:37 am (GMT +10)
Magnitude: 5
Depth: 136.0 km
Epicenter latitude / longitude: 13.81°N / 144.85°E (
Philippines Sea, Guam)
Nearest volcano: NW Rota-1 (88 km / 55 mi)
Nearby towns and cities:
33 km (20 mi) N of Dededo Village (pop: 44,900) –> See nearby quakes!
37 km (23 mi) N of Tamuning-Tumon-Harmon Village (pop: 19,700) –> See nearby quakes!
39 km (24 mi) NNE of Hagåtña (pop: 1,050) –> See nearby quakes!
52 km (32 mi) N of Talofofo Village (pop: 3,220) –> See nearby quakes!
153 km (95 mi) SSW of San Jose (Northern Mariana Islands) (pop: 15,000) –> See nearby quakes!
184 km (114 mi) SSW of Saipan (Northern Mariana Islands) (pop: 48,200) –> See nearby quakes!
43 km (27 mi) NNE of Guam Island (pop: 159,400) –> See nearby quakes!

Weather at epicenter at time of quake:
Scattered Clouds 28.3°C (83 F), humidity: 70%, wind: 8 m/s (15 kts) from E

Primary data source: GFZ (German Research Centre for Geosciences)
Estimated released energy: 2 x 1012 joules (554 megawatt hours, equivalent to 477 tons of TNT) More info

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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.

Magnitude Depth Location Source
M 5.0 136 km Mariana Islands, Guam GFZ
M 5.1 135 km 32 Km NNW of Yigo Village, Guam USGS

User reports for this quake (7)

Leave a comment if you find a particular report interesting or want to add to it.
Flag as inappropriate.

Yona,Guam / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s : I was on third floor in bed, bed started vibrating, the wall made creaking noise. | One user found this interesting.

45.4 km SSW of epicenter [Map] / Moderate shaking (MMI V) / single vertical bump / 5-10 s

Inarajan / Light shaking (MMI IV) / 5-10 s

Tumon, Guam (32.9 km S of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s

Mnagilao / Light shaking (MMI IV) / 2-5 s

32.9 km S of epicenter [Map] / Light shaking (MMI IV)

tamuning guam / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s


More info

Recorded aftershocks, latest first (0 quakes so far, frequently updated):
So far, no aftershocks have been registered.

Earlier earthquakes in the same area

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