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Light mag. 4.8 earthquake - East China Sea, 48 km west of Naha, Okinawa, Japan, on Wednesday, Dec 22, 2021 at 4:07 pm (GMT +9) -

Light mag. 4.8 earthquake - East China Sea, 48 km west of Naha, Okinawa, Japan, on Wednesday, Dec 22, 2021 at 4:07 pm (GMT +9) Light mag. 4.8 earthquake - East China Sea, 48 km west of Naha, Okinawa, Japan, on Wednesday, Dec 22, 2021 at 4:07 pm (GMT +9)

Light magnitude 4.8 earthquake at 109 km depth

22 Dec 07:10 UTC: First to report: VolcanoDiscovery after 4 minutes.
22 Dec 07:16: Now using data updates from EMSC
22 Dec 07:26: Now using data updates from USGS
Update Wed, 22 Dec 2021, 07:27

Moderate earthquake of magnitude 4.8 just reported 48 km west of Naha, Japan

4.8 quake 22 Dec 4:07 pm (GMT +9)
4.8 quake 22 Dec 4:07 pm (GMT +9)
Just 20 minutes ago, a 4.8-magnitude earthquake struck near Naha, Naha Shi, Okinawa, Japan. The tremor was recorded in the afternoon on Wednesday, December 22nd, 2021, at 4:07 pm local time, at an intermediate depth of 108.6 km below the surface.
The event was filed by the United States Geological Survey, the first seismological agency to report it.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 4.8 as well.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Naha (pop. 300,800) located 48 km from the epicenter, Tomigusuku (pop. 55,700) 49 km away, Itoman (pop. 57,200) 49 km away, Chinon (pop. 91,800) 56 km away, Chatan (pop. 27,800) 57 km away, Okinawa (pop. 125,500) 60 km away, Ishikawa (pop. 22,400) 64 km away, Gushikawa (pop. 65,300) 67 km away, Katsuren-haebaru (pop. 34,200) 67 km away, and Naga (pop. 59,600) 87 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 & timeDec 22, 2021 07:07:01 UTC -
Local time at epicenterWednesday, Dec 22, 2021 at 4:07 pm (GMT +9)
StatusConfirmed
Magnitude4.8
Depth108.6 km
Epicenter latitude / longitude26.2732°N / 127.202°E (East China Sea, Japan)
Antipode26.273°S / 52.798°W
Shaking intensityWeak shaking
Felt2 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoIo-Torishima (205 km / 127 mi)
Nearby towns and cities48 km (30 mi) W of Naha (pop: 300,800) | Show on map | Quakes nearby
49 km (30 mi) W of Tomigusuku (pop: 55,700) | Show on map | Quakes nearby
49 km (31 mi) WNW of Itoman (pop: 57,200) | Show on map | Quakes nearby
56 km (35 mi) W of Chinon (pop: 91,800) | Show on map | Quakes nearby
57 km (35 mi) W of Chatan (Nakagami District) (pop: 27,800) | Show on map | Quakes nearby
60 km (37 mi) W of Okinawa (pop: 125,500) | Show on map | Quakes nearby
64 km (40 mi) WSW of Ishikawa (Uruma) (pop: 22,400) | Show on map | Quakes nearby
67 km (42 mi) W of Gushikawa (pop: 65,300) | Show on map | Quakes nearby
67 km (42 mi) W of Katsuren-haebaru (Uruma) (pop: 34,200) | Show on map | Quakes nearby
87 km (54 mi) WSW of Naga (pop: 59,600) | Show on map | Quakes nearby
77 km (48 mi) SW of Iejima Island (pop: 4,610) | Show on map | Quakes nearby
82 km (51 mi) WSW of Okinawa Island (pop: 1,301,000) | Show on map | Quakes nearby
Weather at epicenter at time of quakeLight Rain 20.1°C (68 F), humidity: 90%, wind: 9 m/s (18 kts) from ENE
Estimated seismic energy released1 x 1012 joules (278 megawatt hours, equivalent to 239 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.
Mag.DepthLocationSource
4.8109 kmJapan: NORTHWEST OF RYUKYU ISLANDSUSGS
4.8109 kmRYUKYU ISLANDS, JAPANEMSC
4.8109 kmRyukyu Islands, JapanRaspberryShake

Seismograms

Seismic station: Taipei, Taiwan (TATO/IU network) | Distance from quake: 590 km / 367 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.
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Translate
Ginowan (54.2 km E of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / 5-10 s : Very weak. But a little scary being on the 14th floor  
Okinawa (55.9 km E of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 1-2 s

Earlier earthquakes in the same area

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