Information on the earthquake: moderate mag. 5.6 earthquake – North Pacific Ocean, 94 km northeast of Iwaki, Fukushima, Japan, on Sunday, August 22, 2021 at 11:24 a.m. (GMT +9)

Updated: Aug 22, 2021 08:24 GMT – Refresh

Moderate magnitude earthquake 5.6 to 54 km deep

22 Aug 02:31 UTC: First to report: NIED after 7 minutes.

Updated Sun Aug 22, 2021, 02:36 AM

Significant 5.6 magnitude earthquake 94 km northeast of Iwaki, Japan

5.6 earthquake 22 August 11:24 (GMT +9)

5.6 earthquake 22 August 11:24 (GMT +9)

A magnitude 5.6 earthquake near Iwaki, Iwaki-shi, Fukushima, Japan was reported just 12 minutes ago by the Japan National Research Institute for Earth Sciences and Disaster Resilience ( NIED), considered to be the main national agency monitoring seismic activity in this part of the world. The earthquake occurred at a moderately shallow depth of 54.3 km below the epicenter on the morning of Sunday, August 22, 2021 at 11:24 a.m. local time. 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.
Our monitoring service identified a second report from the National Seismic Surveillance Network (RéNaSS) of France which also listed the earthquake at a magnitude of 5.6. Other agencies reporting the same earthquake include the Euro-Mediterranean Seismological Center (EMSC) at magnitude 5.4 and the German Research Center for Geosciences (GFZ) at magnitude 5.4.
Typically, earthquakes of this magnitude are recorded by more than one agency and results may vary, with subsequent reports that come after the first often showing more accuracy.
Based on preliminary seismic data, the quake was likely felt by many people in the epicenter area. It should not have caused any significant damage, other than objects falling from shelves, broken glass, etc.
In Namie (21,900 inhabitants) located 63 km from the epicenter, the earthquake should have been felt as slight tremors.
Weak tremors could have been felt in Watari (pop. 36,300) located 90 km from the epicenter, Marumori (16,800 inhabitants) 90 km, Kakuda (pop. 33,200) 93 km, Iwaki (pop. 357 300) 94 km, Iwanuma (42,400 inhabitants) 94 km, Ishinomaki (117,200 inhabitants) 99 km and Ōkawara (23,300 inhabitants) 100 km.
VolcanoDiscovery will automatically update the magnitude and depth if these change and follow up if other significant earthquake news becomes available. If you are in the region, please share your experience with us through our reporting mechanism, online or through our mobile app. This will help us provide more first-hand updates to anyone in the world who is interested in learning more about this earthquake.

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Earthquake data:

I felt this tremor

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Date and time: Aug 22, 2021 02:24:35 UTC –
Local time at epicenter: Sunday August 22, 2021 11:24 am (GMT +9)
Size: 5.6

Depth: 54.3 km
Latitude / longitude of epicenter: 37.586 ° N / 141.703 ° E↗ (North Pacific Ocean, Japan)
Antipode: 37.586 ° S / 38.297 ° W↗
Nearest volcano: Adatara (125 km / 78 mi)

Nearby towns and villages:
63 km (39 mi) east of Namie (Futaba-gun) (pop: 21,900) -> Observe the earthquakes nearby!
90 km (56 mi) ESE of Watari (pop: 36,300) -> Observe the earthquakes nearby!
90 km (56 mi) ESE of Marumori (Igu district) (pop: 16,800) -> See nearby earthquakes!
93 km (58 mi) ESE of Kakuda (pop: 33,200) -> Observe the earthquakes nearby!
94 km (58 mi) northeast of Iwaki (pop: 357,300) -> Observe the earthquakes nearby!
94 km (58 mi) southeast of Iwanuma (pop: 42,400) -> Observe the earthquakes nearby!
99 km (61 mi) to SSE of Ishinomaki (pop: 117,200) -> See nearby earthquakes!
100 km (62 mi) ESE of kawara (pop: 23,300) -> See nearby earthquakes!
277 km (172 mi) northeast of Tokyo (pop: 8 336 600) -> Watch the earthquakes nearby!
302 km (187 mi) northeast of Yokohama (pop: 3,574,400) -> See nearby earthquakes!
374 km (232 mi) ENE of Honshū Island (pop: 104,000,000) -> See earthquakes nearby!
426 km (265 mi) NNE of Shikine-jima Island (pop: 600) -> See nearby earthquakes!

Weather at the epicenter at the time of the earthquake:
Heavy rain 24.5 ° C (76 F), humidity: 92%, wind: 3 m / s (5 kts) from NW

Main data source: NIED (National Research Institute for Earth Sciences and Disaster Resilience)

Estimated energy released: 1.6 x 1013 joules (4.4 gigawatt hours, equivalent to 3788 tonnes of TNT or 0.2 atomic bombs!) 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
5.2 54 km Near east coast of Honshu, Japan GFZ
5.3 58 km Japan: Near Sendai RENASS
5.3 54 km 75 km on the east of Namie, Japan USGS
5.3 57 km Near east coast of Honshu, Japan GeoAu

User reports for this earthquake (4)

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Shiroishi shi / Weak shaking (MMI III) / rattling, vibrations / 10-15 s : Low shaking | One user found this interesting.

Sendai, Miyagi (105.5 km northwest of epicenter) [Map] / Slight shaking (MMI IV) / 20-30 s

Sendai, Miyagi (111.1 km northwest of epicenter) [Map] / Slight shaking (MMI IV) / horizontal oscillation (sideways) / 1-2 s (reported via our app)

Sendai (102.6 km northwest of epicenter) [Map] / Slight shaking (MMI IV) / vertical and horizontal oscillation / 10-15 s

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More information

Aftershocks recorded, most recent first (1 earthquakes so far, frequently updated):

  • 22 Aug 2021 05:47 UTC

    | M 2.8 |

    42.3 km (26.3 mi) deep


    Distance of 31 km (19 mi)

    | NIED | Details

Previous earthquakes in the same region

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