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Very strong mag. 6.5 Earthquake - Philippine Sea, 182 km southeast of Hirara, Okinawa, Japan, on Thursday, Nov 11, 2021, at 12:45 am (GMT +9)

A very strong magnitude 6.5 earthquake occurred in the Philippine Sea 166 km (103 mi) from  Japan in the early morning of Thursday, Nov 11, 2021 at 12.45 am local time (GMT +9). The quake had a very shallow depth of 20 km (12 mi) and was reported felt by some people near the epicenter.

Very strong mag. 6.5 Earthquake - Philippine Sea, 182 km southeast of Hirara, Okinawa, Japan, on Thursday, Nov 11, 2021, at 12:45 am (GMT +9) Very strong mag. 6.5 Earthquake - Philippine Sea, 182 km southeast of Hirara, Okinawa, Japan, on Thursday, Nov 11, 2021, at 12:45 am (GMT +9)

Very strong magnitude 6.5 earthquake at 20 km depth

10 Nov 15:51 UTC: First to report: VolcanoDiscovery after 6 minutes.
10 Nov 15:51: Now using data updates from GFZ
... [show all] ...
11 Nov 11:18: Hypocenter depth recalculated from 10.0 to 20.0 km (from 6.2 to 12.4 mi). Epicenter location corrected by 4.9 km (3 mi) towards SSE.

Earthquake details

Date & timeNov 10, 2021 15:45:14 UTC
Local time at epicenterThursday, Nov 11, 2021, at 12:45 am (GMT +9)
StatusConfirmed (manually revised)
Magnitude6.5
Depth20.0 km
Epicenter latitude / longitude23.55°N / 126.45°E Philippine Sea, Japan
Seismic antipode23.55°S / 53.55°W Brazil
Shaking intensityStrong shaking near epicenter
Felt4 reports
Primary data sourceGFZ (German Research Centre for Geosciences)
Weather at epicenter at time of quakeScattered Clouds 22°C (72 F), humidity: 56%, wind: 6 m/s (12 kts) from NNE
Estimated seismic energy released3.5 x 1014 joules (98.6 gigawatt hours, equivalent to 84802 tons of TNT or 5.3 atomic bombs!) | about seismic energy
Interactive map
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Nearby places

The closest larger town where the quake might have been felt is Hirara, a town with 34,000 inhabitants in Japan, in 182 km (113 mi) distance northwest of the epicenter. People likely experienced light shaking there.
The following table shows some of the places that might have been affected (or not) by the shaking.
Distance Place Max. shaking intensity(*) Region Country
182 km (113 mi)
NW of epicenter
Hirara
(pop: 34,400)
IV: Light
Miyakojima Shi, Okinawa
249 km (155 mi)
W of epicenter
Ishigaki
(pop: 44,800)
IV: Light
Okinawa
312 km (194 mi)
N of epicenter
Itoman
(pop: 57,200)
IV: Light
Okinawa
318 km (198 mi)
N of epicenter
Tomigusuku
(pop: 55,700)
IV: Light
Okinawa
322 km (200 mi)
N of epicenter
Naha
(pop: 300,800)
IV: Light
Okinawa
329 km (205 mi)
NE of epicenter
Chinon
(pop: 91,800)
IV: Light
Chinoun, Okinawa
338 km (210 mi)
NE of epicenter
Okinawa
(pop: 125,500)
IV: Light
Okinawa
341 km (212 mi)
NE of epicenter
Katsuren-haebaru
(pop: 34,200)
IV: Light
Uruma Shi, Okinawa
344 km (214 mi)
NE of epicenter
Gushikawa
(pop: 65,300)
IV: Light
Uruma Shi, Okinawa
374 km (233 mi)
NE of epicenter
Naga
(pop: 59,600)
IV: Light
Nago Shi, Okinawa
Notes:
(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.

User-reports for this quake (4)

We received 4 reports for this quake.
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Contribute:
Leave a comment if you find a particular report interesting or want to add to it.
Flag as inappropriate.
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Send your own user report!
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Okinawa, japan / Light shaking (MMI IV) / horizontal (sideways) swinging / 1-2 minutes : Could be felt on 5th floor. Bed was shaking side to side and window was rattling. | 5 users found this interesting.  
yomitan / Very weak shaking (MMI II) / 5-10 s : I was falling asleep and it felt like my bed was moving slightly, it took my a while to realise what was likely happening but then it stopped | One user found this interesting.  
Metro manila,Quezon City / Very weak shaking (MMI II) : No, not at all (reported through our app)  
Hsinchu Taiwan / Very weak shaking (MMI II) / horizontal (sideways) swinging / 2-5 s

What is Intensity and the Mercalli Intensity Scale?


The amount of shaking that occurs on the surface due to an earthquake is called the intensity. It is commonly measured on the so-called Modified Mercalli Intensity Scale (MMI) ranging from 1 (not felt) to 10 (extreme shaking), and given in Roman numerals as I,II,...IX, X, and often displayed with color codes ranging from light blue to dark red.
Earthquake intensity depends mainly on the magnitude and depth of the quake as well as the distance from the epicenter: The further away, the less shaking intensity occurs.
Read more about the MMI scale!

Compare Quake Data

Data for the same earthquake as reported by different agencies

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 Depth Time GMT
2021-11-10
Epicenter Agency
6.5 20 km
12 mi
15:45:14 Japan: Southeast of Ryukyu Islands GFZ (German Research Centre for Geosciences)
6.5 2 km
1.2 mi
15:45:12 Japan: SOUTHEAST OF RYUKYU ISLANDS
9.3 km (5.8 mi) epicenter difference with GFZ
EMSC (European-Mediterranean Seismological Centre)
6.5 10 km
6.2 mi
(*)
15:45:14 Japan: Southeast of Ryukyu Islands
3.8 km (2.4 mi) epicenter difference with GFZ
BMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)
6.3 10 km
6.2 mi
(*)
15:45:14 Japan: Near Taipei
14 km (8.6 mi) epicenter difference with GFZ
RENASS (Réseau National de Surveillance Sismique (RéNaSS))
6.6 10 km
6.2 mi
(*)
15:45:13 Japan: Southeast of Ryukyu Islands
10.3 km (6.4 mi) epicenter difference with GFZ
GeoAu (Geoscience Australia )
6.6 12 km
7.5 mi
15:45:13 177 Km SE of Hirara, Japan
4.8 km (3 mi) epicenter difference with GFZ
USGS (United States Geological Survey)
6.6 9.8 km
6.1 mi
15:45:13 Southeast of Ryukyu Islands, Japan [Sea: Japan]
6.6 km (4.1 mi) epicenter difference with GFZ
INGV (Istituto Nazionale di Geofisica e Vulcanologia)
Notes:
(*) A depth given as 10 km often means that the the depth of the quake could not determined with sufficient accuracy.

Seismograms

Seismic station: Taipei, Taiwan (TATO/IU network) | Distance from quake: 526 km / 327 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. Bandpass filter applied: 0.02-5.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
Show more

4 aftershocks for this quake

For this strong earthquake, 4 aftershocks have been detected so far. The strongest was a magnitude 4.8 quake that hit 1 day 5 hours after the mainshock in 32 km (20 mi) distance, in 196 km southeast of Hirara, Okinawa, Japan, on Friday, Nov 12, 2021 on 05:53 am (Tokyo local time GMT +9).
The most recent aftershock occurred 2 years ago 169 km southeast of Hirara, Okinawa, Japan, and had a magnitude of 4.4.

What are aftershocks?


Larger earthquakes (above magnitude 5 or so) such as this one are usually followed by smaller ones known as aftershocks that occur in the same area during the days, weeks, months or even years after the main shock.
[More info]

What about this quake?


Based on its magnitude, the fault that was active during the quake likely ruptured beneath a surface of approx. 316 km2 (=122 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 31 km (19 mi).
[More info]


Recorded aftershocks, latest first (4 quakes)

Date and Time GMTMag
Depth
DistanceRegionDetails
Jan 10, 2022 10:12 pm (GMT +9)
2 years ago
9 weeks after main shock
4.4

10 km
27 km (17 mi)
W of main shock
169 km SE of Hirara, Okinawa, JapanMore
Nov 12, 2021 05:53 am (GMT +9)
2 years ago
1 day 5 hours after main shock
4.8

10 km
32 km (20 mi)
SW of main shock
196 km SE of Hirara, Okinawa, JapanMore
Nov 11, 2021 01:21 pm (GMT +9)
2 years ago
13 hours after main shock
4.6

10 km
26 km (16 mi)
NW of main shock
156 km SE of Hirara, Okinawa, JapanMore
Nov 11, 2021 10:12 am (GMT +9)
2 years ago
9 hours after main shock
4.5

10 km
25 km (16 mi)
NW of main shock
158 km SE of Hirara, Okinawa, JapanMore
Nov 11, 2021 12:45 am (GMT +9)
2 years ago - felt
6.5

20 km
0 km - This quakePhilippine Sea, 182 km SE of Hirara, Okinawa, Japan
Main Shock (this quake)
More

Map of aftershocks

Earthquake statistics

Average number of earthquakes

Based on data from the past 10 years and our earthquake archive back to 1900, there are about 60 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):
  • Mag. 6 or higher: 0.06 quakes per year (or 1 quake every 18.2 years)
  • Mag. 5 or higher: 0.39 quakes per year (or 1 quake every 2.6 years)
  • Mag. 4 or higher: 3 quakes per year
  • Mag. 3 or higher: 3.6 quakes per year
  • Mag. 2 or higher: 4.2 quakes per year
The area where this quake occurred has a high level of seismic activity. It has had at least 3 quakes above magnitude 6 since 1970, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 15 to 20 years.

Number of quakes per year

Previous quakes in the same area of this earthquake


Strongest in 24 years

The earthquake was the strongest to hit this part of  Japan in over 24 years. Earlier, the last quake of equal or greater strength near the present epicenter had been a magnitude 7.5 earthquake on Monday, May 4, 1998, at 08:30 am (GMT +9) in 181 km (113 mi) distance to the southwest:
Mag. 7.5 earthquake Philippine Sea, Okinawa, Japan - May 4, 1998 -

The strongest-ever (since 1900) recorded quake in this area measured magnitude 7.7. It had occurred 86 years ago earlier, on Friday, Jun 10, 1938, at 06:53 pm (GMT +9) in Okinawa,  Japan:
Mag. 7.7 earthquake East China Sea, Okinawa, Japan - Jun 10, 1938 -




Below is a list and map of (larger or recent) quakes that had occurred near the area of the epicenter before this earthquake (within up to 100 km/61 mi distance, up to 300 km/183 mi for very large quakes above mag. 7). Filter the list to limit the number to show, by magnitude or time before.
Date and TimeMag
Depth
DistanceLocationDetailsMap
Apr 11, 2021 03:24 pm (GMT +9)
Apr 11, 2021 06:24 GMT
4.6

10 km
87 km (54 mi) to the N Philippine Sea, 136 km east of Miyako Island, Okinawa, Japan Info
Feb 7, 2021 09:53 am (GMT +9)
Feb 7, 2021 00:53 GMT
4.3

10 km
67 km (41 mi) to the NW Philippine Sea, 115 km southeast of Hirara, Okinawa, Japan Info
Nov 27, 2020 01:41 pm (GMT +9)
Nov 27, 2020 04:41 GMT
4.3

10 km
66 km (41 mi) to the S Philippine Sea, 220 km southeast of Hirara, Okinawa, Japan Info
Sep 2, 2020 09:48 am (GMT +9)
Sep 2, 2020 00:48 GMT
4.4

10 km
65 km (40 mi) to the NW Philippine Sea, 117 km southeast of Hirara, Okinawa, Japan Info
May 5, 2020 07:28 am (GMT +9)
May 4, 2020 22:28 GMT
4.9

22 km
68 km (42 mi) to the N 494 km east of Taipei, Taipei City, Taiwan, Japan Info
Jul 28, 2019 01:37 am (GMT +9)
Jul 27, 2019 16:37 GMT
4.7

10 km
56 km (35 mi) to the NW Philippine Sea, 125 km southeast of Hirara, Okinawa, Japan 2 reportsInfo
Jul 14, 2018 07:03 am (GMT +9)
Jul 13, 2018 22:03 GMT
4.6

10 km
56 km (35 mi) to the N Philippine Sea, 135 km southeast of Hirara, Okinawa, Japan Info
Feb 25, 2018 01:59 am (GMT +9)
Feb 24, 2018 16:59 GMT
4.6

10 km
100 km (62 mi) to the W Philippine Sea, 137 km south of Hirara, Okinawa, Japan Info
Jan 11, 2018 09:43 am (GMT +9)
Jan 11, 2018 00:43 GMT
5.1

10 km
30 km (18 mi) to the N Philippine Sea, 292 km southwest of Naha, Okinawa, Japan Info
May 10, 2017 07:42 pm (GMT +9)
May 10, 2017 10:42 GMT
4.5

10 km
86 km (53 mi) to the N Philippine Sea, 117 km southeast of Hirara, Okinawa, Japan Info
Jul 7, 2016 07:09 pm (GMT +9)
Jul 7, 2016 10:09 GMT
4.8

10 km
84 km (52 mi) to the N Philippine Sea, 243 km southwest of Naha, Okinawa, Japan Info
Jul 6, 2016 07:41 pm (GMT +9)
Jul 6, 2016 10:41 GMT
4.6

10 km
92 km (57 mi) to the NW Philippine Sea, 92 km southeast of Hirara, Okinawa, Japan Info
Jun 4, 2016 06:00 am (GMT +9)
Jun 3, 2016 21:00 GMT
4.6

10 km
84 km (52 mi) to the N Philippine Sea, 122 km southeast of Hirara, Okinawa, Japan Info
May 30, 2016 06:47 pm (GMT +9)
May 30, 2016 09:47 GMT
5.1

10 km
93 km (58 mi) to the N Philippine Sea, 136 km east of Hirara, Okinawa, Japan Info
May 13, 2016 10:19 pm (GMT +9)
May 13, 2016 13:19 GMT
4.5

19 km
87 km (54 mi) to the NW Philippine Sea, 96 km southeast of Hirara, Okinawa, Japan Info
Apr 27, 2016 04:02 am (GMT +9)
Apr 26, 2016 19:02 GMT
4.8

2 km
70 km (44 mi) to the N Philippine Sea, 119 km southeast of Hirara, Okinawa, Japan Info
Jan 16, 2015 11:24 am (GMT +9)
Jan 16, 2015 02:24 GMT
4.8

2 km
79 km (49 mi) to the NE Philippine Sea, 244 km south of Naha, Okinawa, Japan Info
Jul 30, 2013 07:56 am (GMT +9)
Jul 29, 2013 22:56 GMT
4.8

26 km
26 km (16 mi) to the W Philippine Sea, 169 km southeast of Hirara, Okinawa, Japan Info
Jul 30, 2013 07:56 am (GMT +9)
Jul 29, 2013 22:56 GMT
4.8

9.9 km
25 km (15 mi) to the SW Philippine Sea, 194 km southeast of Hirara, Okinawa, Japan Info
Sep 10, 2012 02:41 pm (GMT +9)
Sep 10, 2012 05:41 GMT
4.7

32 km
73 km (45 mi) to the N Philippine Sea, 115 km southeast of Hirara, Okinawa, Japan Info
Sep 9, 2012 05:55 am (GMT +9)
Sep 8, 2012 20:55 GMT
4.8

10 km
31 km (19 mi) to the E Philippine Sea, 198 km southeast of Hirara, Okinawa, Japan Info
Mar 31, 2012 05:04 am (GMT +9)
Mar 30, 2012 20:04 GMT
4.9

7.1 km
88 km (55 mi) to the N Philippine Sea, 240 km southwest of Naha, Okinawa, Japan Info
May 4, 1998 08:30 am (GMT +9)
May 3, 1998 23:30 GMT
7.5

33 km
181 km (113 mi) to the SW Philippine Sea, 255 km southeast of Ishigaki, Okinawa, Japan Info
Apr 11, 1994 08:45 am (GMT +9)
Apr 10, 1994 23:45 GMT
6.1

10.2 km
45 km (28 mi) to the NE 298 km south of Chinon, Okinawa, Japan Info
Sep 3, 1993 02:00 pm (GMT +9)
Sep 3, 1993 05:00 GMT
5.3

37 km
49 km (30 mi) to the N 145 km southeast of Hirara, Okinawa, Japan Info
May 20, 1989 09:28 pm (GMT +9)
May 20, 1989 12:28 GMT
5.1

33 km
68 km (43 mi) to the W 203 km southeast of Ishigaki, Okinawa, Japan Info
Sep 26, 1988 10:29 am (GMT +9)
Sep 26, 1988 01:29 GMT
5.4

16 km
45 km (28 mi) to the N 293 km southwest of Okinawa, Okinawa, Japan Info
Jul 12, 1986 02:02 am (GMT +9)
Jul 11, 1986 17:02 GMT
5.4

33 km
98 km (61 mi) to the NE 232 km south of Chinon, Okinawa, Japan Info
Dec 12, 1981 01:52 pm (GMT +9)
Dec 12, 1981 04:52 GMT
6.3

10 km
74 km (46 mi) to the NW Philippine Sea, 112 km southeast of Hirara, Okinawa, Japan Info
Nov 3, 1981 07:03 pm (GMT +9)
Nov 3, 1981 10:03 GMT
5.4

33 km
13 km (8.3 mi) to the W 236 km east of Ishigaki, Okinawa, Japan Info
Apr 17, 1980 03:29 pm (GMT +9)
Apr 17, 1980 06:29 GMT
5.4

33 km
41 km (25 mi) to the NE 291 km south of Naha, Okinawa, Japan Info
Feb 5, 1976 01:08 pm (GMT +9)
Feb 5, 1976 04:08 GMT
5.5

33 km
89 km (55 mi) to the W 153 km south of Hirara, Okinawa, Japan Info
Jun 7, 1975 12:49 am (GMT +9)
Jun 6, 1975 15:49 GMT
5.8

16 km
16 km (10 mi) to the SE 198 km southeast of Hirara, Okinawa, Japan Info
Jun 26, 1958 04:39 pm (GMT +9)
Jun 26, 1958 07:39 GMT
5.6

20 km
65 km (40 mi) to the NW 117 km southeast of Hirara, Okinawa, Japan Info
Mar 11, 1958 09:26 am (GMT +9)
Mar 11, 1958 00:26 GMT
7.2

35 km
265 km (165 mi) to the NW East China Sea, 69 km north of Ishigaki, Okinawa, Japan Info
Jun 10, 1938 06:53 pm (GMT +9)
Jun 10, 1938 09:53 GMT
7.7

20 km
214 km (133 mi) to the NW East China Sea, 38 km north of Hirara, Okinawa, Japan Info
Dec 18, 1935 03:17 am (GMT +8)
Dec 17, 1935 19:17 GMT
7.0

15 km
136 km (85 mi) to the SW Philippine Sea, 263 km southeast of Ishigaki, Okinawa, Japan Info
Apr 2, 1921 06:36 pm (GMT +9)
Apr 2, 1921 09:36 GMT
7.0

15 km
167 km (104 mi) to the W Philippine Sea, 91 km southeast of Ishigaki, Okinawa, Japan Info

Map of earlier quakes in the area of this quake

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