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Moderate mag. 4.4 earthquake - Philippine Sea, 83 km southeast of Naha, Okinawa, Japan, on 20 Jul 10:33 pm (GMT +9) -

Moderate mag. 4.4 earthquake - Philippine Sea, 83 km southeast of Naha, Okinawa, Japan, on 20 Jul 10:33 pm (GMT +9) Moderate mag. 4.4 earthquake - Philippine Sea, 83 km southeast of Naha, Okinawa, Japan, on 20 Jul 10:33 pm (GMT +9)

Moderate magnitude 4.4 earthquake at 10 km depth

20 Jul 13:54 UTC: First to report: USGS after 20 minutes.
20 Jul 14:09: Magnitude recalculated from 4.3 to 4.4. Epicenter location corrected by 4.1 km (2.5 mi) towards NNE.
Update Tue, 20 Jul 2021, 14:00

Moderate earthquake of magnitude 4.3 just reported 84 km southeast of Naha, Japan

4.3 quake 20 Jul 10:33 pm (GMT +9)
4.3 quake 20 Jul 10:33 pm (GMT +9)
A magnitude 4.3 earthquake near Naha, Naha Shi, Okinawa, Japan, was reported only 26 minutes ago by the United States Geological Survey, considered one of the key international agencies that monitor seismic activity worldwide. The earthquake occurred at a shallow depth of 10 km beneath the epicenter late at night on Tuesday 20 July 2021 at 10:33 pm local time. 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 European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 4.3 earthquake as well.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Katsuren-haebaru (pop. 34,200) located 77 km from the epicenter, Gushikawa (pop. 65,300) 80 km away, Itoman (pop. 57,200) 80 km away, Chinon (pop. 91,800) 80 km away, Tomigusuku (pop. 55,700) 82 km away, Okinawa (pop. 125,500) 83 km away, Chatan (pop. 27,800) 83 km away, Naha (pop. 300,800) 84 km away, Ishikawa (pop. 22,400) 89 km away, and Nago (pop. 59,600) 98 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 details

Date & timeJul 20, 2021 13:33:56 UTC -
Local time at epicenter20 Jul 10:33 pm (GMT +9)
Depth10.0 km
Epicenter latitude / longitude25.8495°N / 128.4008°E (Philippine Sea, Japan)
Antipode25.85°S / 51.599°W
Shaking intensityLight shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoIo-Torishima (230 km / 143 mi)
Nearby towns and cities75 km (47 mi) SE of Katsuren-haebaru (Uruma) (pop: 34,200) | Show on map | Quakes nearby
78 km (48 mi) SE of Gushikawa (pop: 65,300) | Show on map | Quakes nearby
79 km (49 mi) SE of Chinon (pop: 91,800) | Show on map | Quakes nearby
79 km (49 mi) ESE of Itoman (pop: 57,200) | Show on map | Quakes nearby
81 km (50 mi) SE of Okinawa (pop: 125,500) | Show on map | Quakes nearby
81 km (50 mi) ESE of Tomigusuku (pop: 55,700) | Show on map | Quakes nearby
81 km (50 mi) SE of Chatan (Nakagami District) (pop: 27,800) | Show on map | Quakes nearby
83 km (51 mi) ESE of Naha (pop: 300,800) | Show on map | Quakes nearby
86 km (54 mi) SE of Ishikawa (Uruma) (pop: 22,400) | Show on map | Quakes nearby
95 km (59 mi) SSE of Naga (pop: 59,600) | Show on map | Quakes nearby
88 km (55 mi) SSE of Okinawa Island (pop: 1,301,000) | Show on map | Quakes nearby
115 km (71 mi) SSE of Iejima Island (pop: 4,610) | Show on map | Quakes nearby
Weather at epicenter at time of quakeHeavy Intensity Rain 27.3°C (81 F), humidity: 91%, wind: 23 m/s (45 kts) from ENE
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.
4.410 km75 Km SE of Katsuren-haebaru, JapanUSGS


Seismic station: Taipei, Taiwan (TATO/IU network) | Distance from quake: 700 km / 435 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
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User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.

Earlier earthquakes in the same area

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