Japan earthquakes

M6.1 earthquake 52 km E of Iwaki, Japan

A magnitude 6.1 earthquake struck 52 km E of Iwaki, Japan on Fri, Apr 17, 1987, 4:23 AM JST (19:23 UTC), 55 km (34 mi) below the surface.

A larger quake followed: M6.7 62 km E of Iwaki, 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
6.1 (mw), strong
Local time
UTC
1987-04-16 19:23:25 UTC
Depth
54.9 km (34.1 mi), shallow
Epicenter
37.065° N, 141.473° E
Region
Japan
Strongest shaking
IV, light shaking
Tsunami flag
No
Status
Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated
IV, light shaking
Peak ground acceleration
4.5% of gravity
Peak ground velocity
1.4 cm/s
Map
Automatic
USGS ShakeMap: estimated shaking intensity around the epicenter
Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

No one has reported feeling this quake to the USGS.

Nearest places

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

Nearby

Within 100 km, magnitude 2.5 and up: 15 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 5.042 km E of Namie, Japan · 14401 days ago · 61 km deep · 48 km away
  2. 4.466 km E of Iwaki, Japan · 14399 days ago · 56 km deep · 14 km away
  3. 6.762 km E of Iwaki, Japan · 14398 days ago · 30 km deep · 13 km away
  4. 4.361 km SE of Namie, Japan · 14398 days ago · 55 km deep · 14 km away
  5. 4.479 km ESE of Namie, Japan · 14398 days ago · 33 km deep · 28 km away
  6. 4.631 km SE of Namie, Japan · 14397 days ago · 57 km deep · 31 km away
  7. 4.256 km SE of Namie, Japan · 14395 days ago · 60 km deep · 15 km away
  8. 4.941 km ENE of Iwaki, Japan · 14390 days ago · 61 km deep · 19 km away
  9. 4.565 km ESE of Namie, Japan · 14390 days ago · 50 km deep · 17 km away
  10. 5.184 km E of Iwaki, Japan · 14389 days ago · 48 km deep · 32 km away
  11. 4.649 km ESE of Namie, Japan · 14388 days ago · 55 km deep · 21 km away
  12. 4.740 km SE of Namie, Japan · 14386 days ago · 90 km deep · 23 km away
  13. 4.288 km ESE of Namie, Japan · 14386 days ago · 33 km deep · 41 km away
  14. 5.180 km E of Namie, Japan · 14380 days ago · 40 km deep · 67 km away
  15. 4.639 km ESE of Iwaki, Japan · 14361 days ago · 62 km deep · 17 km away

Before

  1. 4.112 km N of Namie, Japan · 14405 days ago · 118 km deep · 72 km away
  2. 4.4109 km ESE of Iwaki, Japan · 14413 days ago · 53 km deep · 66 km away
  3. 6.771 km E of Namie, Japan · 14414 days ago · 29 km deep · 44 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp000347a (also filed as gcmtb041687c, gcmt19870416192324, iscgem469342). Read Tue, Sep 22, 2026, 10:31 PM UTC.