Moderate mag. 4.3 earthquake - 12 km south of Kumamoto, Japan, on Thursday, 6 May 2021 9:16 am (GMT +9) -
Moderate magnitude 4.3 earthquake at 13 km depth
6 May 00:19 UTC: First to report: VolcanoDiscovery after 3 minutes.
6 May 00:23: Now using data updates from NIED
Update Thu, 6 May 2021, 00:27Moderate magnitude 4.3 earthquake 12 km south of Kumamoto, Japan
4.3 quake 12 km south of Kumamoto, Japan, 6 May 2021 9:16 am (GMT +9)
An earthquake of magnitude 4.3 occurred only 10 minutes ago 12 km south of Kumamoto, Japan, Japan's National Research Institute for Earth Science and Disaster Resilience (NIED) reported.
The quake hit at a shallow depth of 12.9 km beneath the epicenter near Kumamoto, Kumamoto Shi, Japan, in the morning on Thursday 6 May 2021 at 9:16 am 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.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 4.0.
Based on the preliminary seismic data, the quake was probably felt by many people in the area of the epicenter. It should not have caused significant damage, other than objects falling from shelves, broken windows, etc.
In Uto (pop. 39,200) located 4 km from the epicenter, and Matsubase (pop. 26,200) 7 km away, the quake should have been felt as light shaking.
Weak shaking might have been felt in Kumamoto (pop. 680,400) located 12 km from the epicenter, Uekimachi-mōno (pop. 31,700) 23 km away, Honmachi (pop. 104,300) 24 km away, Ōzu (pop. 29,800) 25 km away, Yamaga (pop. 32,300) 36 km away, and Omuta (pop. 132,000) 45 km away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Fukuoka (pop. 1,392,300) located 104 km from the epicenter.
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
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Date & time: 6 May 2021 00:16:50 UTC -
Local time at epicenter:
Thursday, 6 May 2021 9:16 am (GMT +9)
Depth: 12.9 km
Epicenter latitude / longitude: 32.696°N / 130.711°E
Nearest volcano: Unzen
(71 km / 44 mi)
Nearby towns and cities:4 km (3 mi) ENE of Uto
(pop: 39,200) --> See nearby quakes!7 km (4 mi) NE of Matsubase (Uki)
(pop: 26,200) --> See nearby quakes!12 km (8 mi) S of Kumamoto
(pop: 680,400) --> See nearby quakes!23 km (14 mi) S of Uekimachi-mōno (Kumamoto)
(pop: 31,700) --> See nearby quakes!24 km (15 mi) NNE of Honmachi
(pop: 104,300) --> See nearby quakes!25 km (16 mi) SW of Ōzu (Kikuchi District)
(pop: 29,800) --> See nearby quakes!36 km (22 mi) S of Yamaga
(pop: 32,300) --> See nearby quakes!45 km (28 mi) SE of Omuta (Fukuoka)
(pop: 132,000) --> See nearby quakes!104 km (65 mi) SSE of Fukuoka
(pop: 1,392,300) --> See nearby quakes!890 km (553 mi) WSW of Tokyo
(pop: 8,336,600) --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky 16.8°C
(62 F), humidity: 48%, wind: 2 m/s (4 kts)
Primary data source: NIED
(National Research Institute for Earth Science and Disaster Resilience)
Estimated released energy: 1.8 x 1011
joules (49.4 megawatt hours, equivalent to 42.5 tons of TNT) More info
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.
|4.3||13 km||Near Sasebo, Nagasaki, Japan||NIED|
|unknown||n/a||NW KUMAMOTO PREF, Japan||VolcanoDiscovery|
|4.0||10 km||KYUSHU, JAPAN||EMSC|
User reports for this quake (7)
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Sasebo (107.6 km WNW of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / very short : Very weak shaking that lasted a couple of seconds. | One user found this interesting.
Kumamoto City / Weak shaking (MMI III) / 2-5 s
Daizenji / Very weak shaking (MMI II) / single lateral shake / 5-10 s
Lake ezu (9.6 km N of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s
Tosu / Weak shaking (MMI III)
久留米市 (66.5 km NNW of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / 2-5 s
Fukuoka / Very weak shaking (MMI II) / very short
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