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Light mag. 4.4 earthquake - Philippine Sea, 49 km east of Naga, Nago Shi, Okinawa, Japan, on 1 Aug 4:53 pm (GMT +9) -

Light mag. 4.4 earthquake - Philippine Sea, 49 km east of Naga, Nago Shi, Okinawa, Japan, on 1 Aug 4:53 pm (GMT +9) Light mag. 4.4 earthquake - Philippine Sea, 49 km east of Naga, Nago Shi, Okinawa, Japan, on 1 Aug 4:53 pm (GMT +9)

Light magnitude 4.4 earthquake at 31 km depth

1 Aug 07:56 UTC: First to report: VolcanoDiscovery after 3 minutes.
1 Aug 08:06: Now using data updates from EMSC
1 Aug 08:52: Magnitude recalculated from 4.1 to 4.4. Hypocenter depth recalculated from 30.0 to 31.0 km (from 18.6 to 19.3 mi). Epicenter location corrected by 14 km (8.7 mi) towards SSE.
Update Sun, 1 Aug 2021, 08:12

Moderate tremor of magnitude 4.1 just reported 46 km northeast of Nago, Japan

4.1 quake 1 Aug 4:53 pm (GMT +9)
4.1 quake 1 Aug 4:53 pm (GMT +9)
Just 19 minutes ago, a 4.1-magnitude earthquake struck near Nago, Nago Shi, Okinawa, Japan. The tremor was recorded in the afternoon on Sunday 1 August 2021 at 4:53 pm local time, at a moderately shallow depth of 30 km below the surface.
The event was filed by the European-Mediterranean Seismological Centre (EMSC), the first seismological agency to report it.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Nago (pop. 59,600) located 46 km from the epicenter, Ishikawa (pop. 22,400) 71 km away, Gushikawa (pop. 65,300) 72 km away, Katsuren-haebaru (pop. 34,200) 74 km away, Okinawa (pop. 125,500) 79 km away, Chatan (pop. 27,800) 83 km away, Chinon (pop. 91,800) 87 km away, Naha (pop. 300,800) 96 km away, and Tomigusuku (pop. 55,700) 99 km away.

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Earthquake details

Date & timeAug 1, 2021 07:53:18 UTC -
Local time at epicenter1 Aug 4:53 pm (GMT +9)
Depth31.0 km
Epicenter latitude / longitude26.69°N / 128.47°E (Philippine Sea, Japan)
Antipode26.69°S / 51.53°W
Shaking intensityVery weak shaking
Felt2 reports
Primary data sourceEMSC (European-Mediterranean Seismological Centre)
Nearest volcanoIo-Torishima (127 km / 79 mi)
Nearby towns and cities49 km (30 mi) E of Naga (pop: 59,600) | Show on map | Quakes nearby
70 km (44 mi) ENE of Gushikawa (pop: 65,300) | Show on map | Quakes nearby
71 km (44 mi) ENE of Ishikawa (Uruma) (pop: 22,400) | Show on map | Quakes nearby
71 km (44 mi) NE of Katsuren-haebaru (Uruma) (pop: 34,200) | Show on map | Quakes nearby
77 km (48 mi) ENE of Okinawa (pop: 125,500) | Show on map | Quakes nearby
82 km (51 mi) ENE of Chatan (Nakagami District) (pop: 27,800) | Show on map | Quakes nearby
85 km (53 mi) NE of Chinon (pop: 91,800) | Show on map | Quakes nearby
94 km (59 mi) NE of Naha (pop: 300,800) | Show on map | Quakes nearby
96 km (60 mi) NE of Tomigusuku (pop: 55,700) | Show on map | Quakes nearby
101 km (63 mi) NE of Itoman (pop: 57,200) | Show on map | Quakes nearby
53 km (33 mi) ENE of Okinawa Island (pop: 1,301,000) | Show on map | Quakes nearby
68 km (42 mi) E of Iejima Island (pop: 4,610) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 28.3°C (83 F), humidity: 84%, wind: 8 m/s (15 kts) from SSE
Estimated seismic energy released2.5 x 1011 joules (69.8 megawatt hours, equivalent to 60 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.
4.431 km48 Km E of Nago, JapanUSGS


Seismic station: Taipei, Taiwan (TATO/IU network) | Distance from quake: 723 km / 449 mi | Show on map | Station Info
Seismic station Taipei, Taiwan: 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
Show more

User reports for this quake (2)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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!
Chatan, Okinawa (82.5 km WSW of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 15-20 s : Pretty decent! | 8 users found this interesting.  
near Nago, Okinawa (31.4 km W of epicenter) [Map] / Very weak shaking (MMI II) : Three or four wiggles of my queen size bed. | 5 users found this interesting.  

Earlier earthquakes in the same area

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