Strong mag. 5.3 earthquake - North Pacific Ocean, 130 km east of Mito, Ibaraki, Japan, on Wednesday, Aug 4, 2021 1:40 pm (GMT +9) -

This quake was likely an aftershock of the 5.8 quake North Pacific Ocean, 98 km northeast of Hasaki, Chōshi-shi, Chiba, Japan, Aug 4, 2021 5:33 am (GMT +9), which had occurred 8 hours earlier.
Strong mag. 5.3 earthquake - North Pacific Ocean, 130 km east of Mito, Ibaraki, Japan, on Wednesday, Aug 4, 2021 1:40 pm (GMT +9)

Strong magnitude 5.3 earthquake at 10 km depth

4 Aug 04:48 UTC: First to report: GFZ after 8 minutes.
4 Aug 04:50: Magnitude recalculated from 5.3 to 5.5. Epicenter location corrected by 4.2 km (2.6 mi) towards WNW.
4 Aug 06:50: Magnitude recalculated from 5.5 to 5.3.
Date & time: Aug 4, 2021 04:40:24 UTC -
Local time at epicenter: Wednesday, Aug 4, 2021 1:40 pm (GMT +9)
Magnitude: 5.3
Depth: 10.0 km
Epicenter latitude / longitude: 36.1°N / 141.86°E (North Pacific Ocean, Japan)
Antipode: 36.1°S / 38.14°W
Nearest volcano: Nasu (204 km / 127 mi)
Nearby towns and cities:
101 km (63 mi) ENE of Hasaki (pop: 39,200) --> See nearby quakes!
110 km (69 mi) E of Kashima-shi (pop: 65,800) --> See nearby quakes!
122 km (76 mi) ESE of Hitachi (pop: 186,300) --> See nearby quakes!
123 km (76 mi) ESE of Katsuta (pop: 156,000) --> See nearby quakes!
123 km (77 mi) ESE of Hitachi-Naka (pop: 156,800) --> See nearby quakes!
124 km (77 mi) E of Katori-shi (pop: 83,200) --> See nearby quakes!
130 km (80 mi) E of Mito (pop: 246,500) --> See nearby quakes!
137 km (85 mi) SE of Iwaki (pop: 357,300) --> See nearby quakes!
201 km (125 mi) ENE of Tokyo (pop: 8,336,600) --> See nearby quakes!
213 km (132 mi) ENE of Yokohama (pop: 3,574,400) --> See nearby quakes!
347 km (216 mi) E of Honshū Island (pop: 104,000,000) --> See nearby quakes!
311 km (193 mi) NE of Shikine-jima Island (pop: 600) --> See nearby quakes!
Weather at epicenter at time of quake:
Scattered Clouds 26.9°C (80 F), humidity: 78%, wind: 4 m/s (8 kts) from SSE
Primary data source: GFZ (German Research Centre for Geosciences)
Estimated released energy: 5.6 x 1012 joules (1.56 gigawatt hours, equivalent to 1344 tons of TNT) More info
Show interactive Map
[smaller] [bigger]
If you felt this quake (or if you were near the epicenter), please share your experience and submit a short "I felt it" report! Other users would love to hear about it!
If you did NOT feel the quake although you were in the area, please report it! Your contribution is valuable to earthquake science, seismic hazard analysis and mitigation efforts. You can use your device location or the map to indicate where you were during the earthquake. Thank you!

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.
Mag.DepthLocationSource
5.310 kmNear East Coast of Honshu, JapanGFZ
5.410 kmOFF EAST COAST OF HONSHU, JAPANEMSC
5.410 kmJapan: Near TokyoRENASS
5.410.1 km95 Km ENE of Hasaki, JapanUSGS
5.910 kmNear East Coast of Honshu, JapanBMKG
5.429 kmNear East Coast of Honshu, JapanGeoAu

User reports for this quake (4)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Contribute:
Leave a comment if you find a particular report interesting or want to add to it.
Flag as inappropriate.
Mark as helpful or interesting.
Send your own user report!
Translate
Narita / Very weak shaking (MMI II) / horizontal (sideways) swinging / 5-10 s
Chuo-ku Tokyo (192.6 km WSW of epicenter) [Map] / Weak shaking (MMI III) / 10-15 s (reported through our app)
牛久市 (152.7 km W of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s (reported through our app)
Fukushima ken (222.2 km NW of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake : Weak shaking  
Volcanoes & Earthquakes - new app for Android

Earlier earthquakes in the same area

Try our free app!
Volcanoes & Earthquakes - new app for Android
Android | iOS version
Why is there advertising on this site?
Support us - Help us upgrade our services!
We truly love working to bring you the latest volcano and earthquake data from around the world. Maintaining our website and our free apps does require, however, considerable time and resources.
We need financing to increase hard- and software capacity as well as support our editor team. We're aiming to achieve uninterrupted service wherever an earthquake or volcano eruption unfolds, and your donations can make it happen! Every donation will be highly appreciated. If you find the information useful and would like to support our team in integrating further features, write great content, and in upgrading our soft- and hardware, please make a donation (PayPal or Online credit card payment).

Planned features:
  • Improved multilanguage support
  • Tsunami alerts
  • Faster responsiveness
Thanks to your past donations, these features have been added recently:
  • Earthquake archive from 1900 onwards
  • Detailed quake stats
  • Additional seismic data sources
Download and Upgrade the Volcanoes & Earthquakes app to get one of the fastest seismic and volcano alerts online:
Android | IOS
Thank you!
Copyrights: VolcanoDiscovery and other sources as noted.
Use of material: Most texts and images, in particular photographs, on this website are protected by copyright. Further reproduction and use of without authorization is usually not consented. If you are not sure or need licensing rights for photographs, for example for publications and commercial use, please contact us.