Japan earthquakes

M4.8 earthquake 27 km ENE of Iwaki, Japan

A magnitude 4.8 earthquake struck 27 km ENE of Iwaki, Japan on Mon, Feb 27, 2017, 12:03 AM JST (15:03 UTC), 48 km (30 mi) below the surface.

A larger quake followed: M5.7 30 km ENE of Namie, Japan. This one was a foreshock.

Iwaki forecastMore in Japan

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.8 (Mww, W-phase moment), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2017-02-26 15:03:33 UTC
Depth
48.3 km (30.0 mi), shallow
Epicenter
37.159° N, 141.166° E
Region
Japan
Felt reports
34
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

34 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting
Reverse (thrust)
Moment magnitude
4.8 Mww
Nodal plane 1
Strike 183°, dip 23°, rake 80°
Nodal plane 2
Strike 13°, dip 67°, rake 94°

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 4.6 km horizontally, 4.5 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
75°
Stations used
288

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.8 and up: 18 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 4.2near the east coast of Honshu, Japan · 3507 days ago · 19 km deep · 29 km away
  2. 5.730 km ENE of Namie, Japan · 3506 days ago · 47 km deep · 48 km away · felt by 100
  3. 4.8111 km E of Iwaki, Japan · 3506 days ago · 24 km deep · 89 km away
  4. 4.234 km E of ?arai, Japan · 3505 days ago · 59 km deep · 98 km away · felt by 1
  5. 5.037 km ENE of Namie, Japan · 3505 days ago · 54 km deep · 51 km away · felt by 12
  6. 4.136 km E of Namie, Japan · 3502 days ago · 46 km deep · 39 km away
  7. 4.640 km SE of Namie, Japan · 3500 days ago · 14 km deep · 18 km away · felt by 2
  8. 5.345 km E of Namie, Japan · 3494 days ago · 44 km deep · 51 km away · felt by 49
  9. 4.345 km SE of Namie, Japan · 3494 days ago · 35 km deep · 20 km away
  10. 4.649 km E of Namie, Japan · 3484 days ago · 14 km deep · 43 km away · felt by 1
  11. 4.126 km ESE of Kitaibaraki, Japan · 3483 days ago · 47 km deep · 54 km away · felt by 2
  12. 4.419 km N of Daigo, Japan · 3479 days ago · 57 km deep · 77 km away
  13. 4.012 km W of Kitaibaraki, Japan · 3473 days ago · 35 km deep · 64 km away · felt by 5
  14. 4.850 km E of Namie, Japan · 3466 days ago · 43 km deep · 57 km away · felt by 8
  15. 4.610 km NW of Takahagi, Japan · 3455 days ago · 24 km deep · 63 km away · felt by 8
  16. 5.073 km ESE of Namie, Japan · 3455 days ago · 38 km deep · 59 km away · felt by 19
  17. 4.44 km NW of Takahagi, Japan · 3455 days ago · 10 km deep · 64 km away · felt by 6
  18. 4.433 km ENE of Iwaki, Japan · 3451 days ago · 39 km deep · 6 km away · felt by 1

Before

  1. 4.632 km SSE of Namie, Japan · 3507 days ago · 61 km deep · 8 km away · felt by 1
  2. 4.343 km ESE of Hitachi, Japan · 3508 days ago · 36 km deep · 82 km away · felt by 2
  3. 4.183 km ENE of Namie, Japan · 3515 days ago · 57 km deep · 91 km away
  4. 4.143 km ENE of Iwaki, Japan · 3523 days ago · 10 km deep · 17 km away
  5. 5.266 km ESE of Namie, Japan · 3523 days ago · 7 km deep · 49 km away · felt by 23
  6. 4.251 km ESE of Hitachi, Japan · 3525 days ago · 41 km deep · 78 km away · felt by 7
  7. 4.543 km ESE of Namie, Japan · 3526 days ago · 23 km deep · 27 km away
  8. 4.613 km WNW of Takahagi, Japan · 3526 days ago · 36 km deep · 68 km away · felt by 6
  9. 4.461 km E of Namie, Japan · 3527 days ago · 47 km deep · 65 km away
  10. 4.830 km ESE of Namie, Japan · 3530 days ago · 25 km deep · 27 km away · felt by 1
  11. 4.3near the east coast of Honshu, Japan · 3530 days ago · 37 km deep · 100 km away · felt by 2

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us20008mit. Read Sun, Oct 4, 2026, 7:51 PM UTC.