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Moderate mag. 4.6 earthquake - East China Sea, 69 km southwest of Jeju City, Jeju-do, South Korea, on Tuesday, Dec 14, 2021 at 5:19 pm (GMT +9) -

Moderate mag. 4.6 earthquake - East China Sea, 69 km southwest of Jeju City, Jeju-do, South Korea, on Tuesday, Dec 14, 2021 at 5:19 pm (GMT +9) Moderate mag. 4.6 earthquake - East China Sea, 69 km southwest of Jeju City, Jeju-do, South Korea, on Tuesday, Dec 14, 2021 at 5:19 pm (GMT +9)

Moderate magnitude 4.6 earthquake at 10 km depth

14 Dec 08:26 UTC: First to report: VolcanoDiscovery after 7 minutes.
14 Dec 09:03: Now using data updates from GFZ
14 Dec 15:12: Now using data updates from USGS
21 Dec 07:52: Epicenter location corrected by 2.5 km (1.5 mi) towards SE.

Earthquake details

Date & timeDec 14, 2021 08:19:15 UTC -
Local time at epicenterTuesday, Dec 14, 2021 at 5:19 pm (GMT +9)
StatusConfirmed
Magnitude4.6
Depth10.0 km
Epicenter latitude / longitude33.066°N / 126.0034°E (East China Sea, South Korea)
Antipode33.066°S / 53.997°W
Shaking intensityLight shaking
Felt34 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoHalla (60 km / 37 mi)
Nearby towns and cities53 km (33 mi) SSW of Gaigeturi (pop: 23,700) | Show on map | Quakes nearby
56 km (35 mi) WSW of Seogwipo (pop: 155,700) | Show on map | Quakes nearby
69 km (43 mi) SW of Jeju City (pop: 486,300) | Show on map | Quakes nearby
198 km (123 mi) S of Mokpo (pop: 268,400) | Show on map | Quakes nearby
218 km (136 mi) S of Muan (pop: 75,700) | Show on map | Quakes nearby
242 km (150 mi) SSW of Masan (pop: 434,400) | Show on map | Quakes nearby
243 km (151 mi) SW of Yeosu (pop: 295,500) | Show on map | Quakes nearby
247 km (154 mi) SSW of Gwangju (pop: 1,416,900) | Show on map | Quakes nearby
359 km (223 mi) SW of Busan (pop: 3,678,600) | Show on map | Quakes nearby
508 km (316 mi) S of Seoul (pop: 10,349,300) | Show on map | Quakes nearby
63 km (39 mi) SW of Jejudo Island (pop: 621,600) | Show on map | Quakes nearby
Estimated seismic energy released5 x 1011 joules (139 megawatt hours, equivalent to 120 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
4.610 km52 Km SW of Gaigeturi, South KoreaUSGS
4.710 kmSOUTH KOREAEMSC
4.610 kmSouth KoreaRaspberryShake
4.710 kmNear Daejeon, Daejeon, South KoreaGFZ

Seismograms

Seismic station: Inchon, Republic of Korea (INCN/IU network) | Distance from quake: 494 km / 307 mi | Show on map | Station Info
Seismic station Inchon, Republic of Korea: 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 (39)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Daejeon (387.9 km NNE of epicenter) [Map] / Weak shaking (MMI III) / vibration and rolling : Like on a boat | 4 users found this interesting.  
Gwangju, South Korea (245 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / 1-2 s : I felt floor shaking. As well I could see the desktop shaking. | 3 users found this interesting.  
At home in Bitgaram dong in Naju / Very weak shaking (MMI II) / single lateral shake / 15-20 s : It felt like a very wake shake but it felt king of strong I was in the 13 floor so the building really move a lot | 2 users found this interesting.  
Hallasan / not felt : I didn't feel anything during the hike at mount halla.then suddenly right after we boarded the bus, there was news about the earthquake | 2 users found this interesting.  
Gwangju Metropolitan City (245.2 km NNE of epicenter) [Map] / Light shaking (MMI IV) / simple rolling (tilting sideways along one direction) / 2-5 s : (I was sitting in bed) It rocked my bed enough that it was as if I was shifting positions heavily, moving my mattress and making the headboard hit the wall as I was sitting still in bed, studying. As I ran to take shelter (as a precaution) I could feel th | One user found this interesting.  
Gwangju Bukgu / Weak shaking (MMI III) / horizontal (sideways) swinging / 2-5 s : I was in the elevator, 12th floor, it suddenly moved left-right. | 3 users found this interesting.  
Sagye / Light shaking (MMI IV) / single lateral shake / 2-5 s : A bang heard followed by light lateral shaking lasting a few seconds. | 2 users found this interesting.  
Seoul / Very weak shaking (MMI II) : Felt nothing at all. | 2 users found this interesting.  
GEC seogwipo jeju / Moderate shaking (MMI V) / horizontal (sideways) swinging / 5-10 s : It was the strongest earthquake I felt ever since | 2 users found this interesting.  
홍성군 홍성읍 / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : it was like something huge moving at the bottom. | 2 users found this interesting.  
near Gaigeturi, Jeju-do (36.7 km NE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 10-15 s : Furniture shaking, no damage! | One user found this interesting.  
Sangbang-ro (35.2 km NE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s : Vibration | One user found this interesting.  
Pyeongtaek / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s : I was lying on my bed watching TV when I recieved an alert of the earthquake on my phone. I immediately switched to a news channel for more information. Less than two minutes later my apartment building began to noticably sway back and forth for approxima  
Seoul / not felt : Not felt | One user found this interesting.  
Yongsu-ri / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : Building shaking and rumbling for 4-5 seconds | One user found this interesting.  
near Gaigeturi, Jeju-do (35.3 km NE of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / 1-2 s
Suncheon (249.4 km NNE of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / very short
Daejeong-eup (35.4 km NE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 1-2 s
Gwangju (244 km NNE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 5-10 s
mokpo (192.9 km NNE of epicenter) [Map] / Light shaking (MMI IV) / 2-5 s
near Gaigeturi, Jeju-do (42.1 km NE of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / 1-2 s
Jeju-si (67 km NE of epicenter) [Map] / Light shaking (MMI IV) / 2-5 s
Seogwipo-si (45.6 km NE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 10-15 s
Mokpo, Jeollanam-do (196.4 km N of epicenter) [Map] / Light shaking (MMI IV) / 2-5 s
Masan (247 km NNE of epicenter) [Map] / not felt
near Gaigeturi, Jeju-do (37.2 km NE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
Jeju do (43.2 km NE of epicenter) [Map] / Weak shaking (MMI III)
Jeju do (43.2 km NE of epicenter) [Map] / Weak shaking (MMI III)
Suwon / Weak shaking (MMI III) / 1-2 s (reported through our app)
Mount Hallasan / not felt
Incheon Airport / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s (reported through our app)
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