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Moderate mag. 4.9 earthquake - East China Sea, Japan, on Tuesday, Oct 12, 2021 at 12:35 pm (GMT +9) -

Moderate mag. 4.9 earthquake - East China Sea, Japan, on Tuesday, Oct 12, 2021 at 12:35 pm (GMT +9) Moderate mag. 4.9 earthquake - East China Sea, Japan, on Tuesday, Oct 12, 2021 at 12:35 pm (GMT +9)

Moderate magnitude 4.9 earthquake at 29 km depth

12 Oct 04:00 UTC: First to report: USGS after 24 minutes.
15 Oct 02:44: Hypocenter depth recalculated from 36.0 to 29.2 km (from 22 to 18.1 mi). Epicenter location corrected by 3 km (1.9 mi) towards N.

Earthquake details

Date & timeOct 12, 2021 03:35:43 UTC -
Local time at epicenterTuesday, Oct 12, 2021 at 12:35 pm (GMT +9)
StatusConfirmed
Magnitude4.9
Depth29.2 km
Epicenter latitude / longitude25.4799°N / 126.497°E (East China Sea, Japan)
Antipode25.48°S / 53.503°W
Shaking intensityWeak shaking
Felt1 report
Primary data sourceUSGS (United States Geological Survey)
Nearby towns and cities138 km (86 mi) WSW of Itoman (pop: 57,200) | Show on map | Quakes nearby
142 km (88 mi) ENE of Hirara (Miyakojima) (pop: 34,400) | Show on map | Quakes nearby
142 km (88 mi) SW of Tomigusuku (pop: 55,700) | Show on map | Quakes nearby
144 km (90 mi) SW of Naha (pop: 300,800) | Show on map | Quakes nearby
154 km (95 mi) SW of Chinon (pop: 91,800) | Show on map | Quakes nearby
157 km (98 mi) SW of Chatan (Nakagami District) (pop: 27,800) | Show on map | Quakes nearby
162 km (100 mi) SW of Okinawa (pop: 125,500) | Show on map | Quakes nearby
167 km (104 mi) SW of Katsuren-haebaru (Uruma) (pop: 34,200) | Show on map | Quakes nearby
168 km (105 mi) SW of Gushikawa (pop: 65,300) | Show on map | Quakes nearby
195 km (121 mi) SW of Naga (pop: 59,600) | Show on map | Quakes nearby
188 km (117 mi) SW of Okinawa Island (pop: 1,301,000) | Show on map | Quakes nearby
189 km (117 mi) SW of Iejima Island (pop: 4,610) | Show on map | Quakes nearby
Weather at epicenter at time of quakeLight Rain 27.1°C (81 F), humidity: 87%, wind: 14 m/s (27 kts) from ESE
Estimated seismic energy released1.4 x 1012 joules (392 megawatt hours, equivalent to 338 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
4.929 km137 Km WSW of Itoman, JapanUSGS
4.940 kmRYUKYU ISLANDS, JAPANEMSC
4.845 kmRyukyu Islands, JapanGFZ

Seismograms

Seismic station: Taipei, Taiwan (TATO/IU network) | Distance from quake: 506 km / 314 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 (1)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Chatan / Weak shaking (MMI III) / very short : Noticed my laptop was slightly moving and then felt the building move ever so slightly. It was over before I knew what was going on  

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