Japan earthquakes

M4.2 earthquake 46 km ENE of Iwaki, Japan

A magnitude 4.2 earthquake struck 46 km ENE of Iwaki, Japan on Fri, Jan 30, 1987, 8:14 AM JST (23:14 UTC), 57 km (36 mi) below the surface.

A larger quake followed: M6.4 80 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
4.2 (mb), light
Local time
UTC
1987-01-29 23:14:52 UTC
Depth
57.2 km (35.5 mi), shallow
Epicenter
37.185° N, 141.382° E
Region
Japan
Tsunami flag
No
Status
Reviewed by a seismologist

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 1.5 and up: 15 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 6.480 km E of Iwaki, Japan · 14473 days ago · 36 km deep · 42 km away
  2. 6.872 km E of Iwaki, Japan · 14473 days ago · 48 km deep · 35 km away
  3. 4.791 km E of Iwaki, Japan · 14473 days ago · 33 km deep · 49 km away
  4. 4.959 km ESE of Hitachi, Japan · 14467 days ago · 62 km deep · 86 km away
  5. 5.117 km ESE of Takahagi, Japan · 14467 days ago · 64 km deep · 76 km away
  6. 4.3113 km ESE of Iwaki, Japan · 14465 days ago · 54 km deep · 77 km away
  7. 4.767 km E of Iwaki, Japan · 14465 days ago · 60 km deep · 23 km away
  8. 4.930 km ESE of Iwaki, Japan · 14464 days ago · 42 km deep · 30 km away
  9. 4.389 km SE of Ishinomaki, Japan · 14453 days ago · 49 km deep · 88 km away
  10. 5.664 km E of Iwaki, Japan · 14452 days ago · 49 km deep · 32 km away
  11. 4.825 km ESE of Watari, Japan · 14452 days ago · 92 km deep · 87 km away
  12. 4.836 km ESE of Namie, Japan · 14451 days ago · 62 km deep · 21 km away
  13. 4.851 km E of Iwaki, Japan · 14447 days ago · 56 km deep · 10 km away
  14. 5.670 km ESE of Iwaki, Japan · 14442 days ago · 47 km deep · 38 km away
  15. 5.184 km E of Iwaki, Japan · 14442 days ago · 46 km deep · 48 km away

Before

  1. 4.415 km SW of Iwaki, Japan · 14485 days ago · 100 km deep · 60 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0003213. Read Tue, Sep 22, 2026, 10:25 PM UTC.