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Weak mag. 3.8 earthquake - East China Sea, 91 km west of Naha, Okinawa, Japan, on Thursday, Apr 8, 2021 at 10:54 pm (GMT +8)

Weak mag. 3.8 earthquake - East China Sea, 91 km west of Naha, Okinawa, Japan, on Thursday, Apr 8, 2021 at 10:54 pm (GMT +8) Weak mag. 3.8 earthquake - East China Sea, 91 km west of Naha, Okinawa, Japan, on Thursday, Apr 8, 2021 at 10:54 pm (GMT +8)

Weak magnitude 3.8 earthquake at 60 km depth

8 Apr 15:06 UTC: First to report: EMSC after 12 minutes.

Earthquake details

Date & timeApr 8, 2021 14:54:30 UTC
Local time at epicenterThursday, Apr 8, 2021 at 10:54 pm (GMT +8)
Depth60.0 km
Epicenter latitude / longitude26°N / 126.8°E (East China Sea, Japan)
Antipode26°S / 53.2°W
Shaking intensityVery weak shaking
Felt0 reports
Primary data sourceEMSC (European-Mediterranean Seismological Centre)
Nearby towns and cities88 km (55 mi) W of Itoman (pop: 57,200) | Show on map | Quakes nearby
90 km (56 mi) WSW of Tomigusuku (pop: 55,700) | Show on map | Quakes nearby
91 km (57 mi) WSW of Naha (pop: 300,800) | Show on map | Quakes nearby
100 km (62 mi) WSW of Chinon (pop: 91,800) | Show on map | Quakes nearby
103 km (64 mi) WSW of Chatan (Nakagami District) (pop: 27,800) | Show on map | Quakes nearby
107 km (66 mi) WSW of Okinawa (pop: 125,500) | Show on map | Quakes nearby
114 km (71 mi) WSW of Gushikawa (pop: 65,300) | Show on map | Quakes nearby
137 km (85 mi) WSW of Naga (pop: 59,600) | Show on map | Quakes nearby
127 km (79 mi) SW of Iejima Island (pop: 4,610) | Show on map | Quakes nearby
131 km (81 mi) WSW of Okinawa Island (pop: 1,301,000) | Show on map | Quakes nearby
Weather at epicenter at time of quakeBroken Clouds 20.6°C (69 F), humidity: 62%, wind: 6 m/s (12 kts) from ENE
Estimated seismic energy released3.2 x 1010 joules (8.78 megawatt hours, equivalent to 7.56 tons of TNT) | about seismic energy
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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.


Seismic station: Okinawa Kunigami (JOW/JP network) | Distance from quake: 174 km / 108 mi | Show on map | Station Info
Seismic station Okinawa Kunigami: 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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