Japan earthquakes

M4.2 earthquake 68 km SW of Yonakuni, Japan

A magnitude 4.2 earthquake struck 68 km SW of Yonakuni, Japan on Fri, May 31, 1985, 11:17 PM GMT+8 (15:17 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.9 38 km ESE of Yilan, Taiwan. This one was a foreshock.

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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
1985-05-31 15:17:10 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
23.985° N, 122.584° 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.

How well it is located

Reviewed by a seismologist.

Depth from
OPERATOR_ASSIGNED

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 2 in the 30 days before it.

After

  1. 4.360 km ESE of Yilan, Taiwan · 15083 days ago · 30 km deep · 75 km away
  2. 5.938 km ESE of Yilan, Taiwan · 15082 days ago · 28 km deep · 84 km away
  3. 4.363 km ESE of Yilan, Taiwan · 15082 days ago · 10 km deep · 63 km away
  4. 4.158 km ESE of Yilan, Taiwan · 15082 days ago · 10 km deep · 67 km away
  5. 3.963 km WNW of Yonakuni, Japan · 15080 days ago · 10 km deep · 79 km away
  6. 3.933 km SE of Yilan, Taiwan · 15080 days ago · 10 km deep · 87 km away
  7. 4.661 km WNW of Yonakuni, Japan · 15080 days ago · 10 km deep · 72 km away
  8. 4.356 km WNW of Yonakuni, Japan · 15079 days ago · 10 km deep · 77 km away
  9. 4.372 km SW of Yonakuni, Japan · 15077 days ago · 32 km deep · 13 km away
  10. 4.263 km WNW of Yonakuni, Japan · 15075 days ago · 10 km deep · 72 km away
  11. 4.086 km S of Yonakuni, Japan · 15073 days ago · 33 km deep · 52 km away
  12. 3.742 km ESE of Yilan, Taiwan · 15063 days ago · 10 km deep · 81 km away
  13. 4.864 km WNW of Yonakuni, Japan · 15060 days ago · 10 km deep · 73 km away
  14. 4.828 km NNE of Hualien City, Taiwan · 15054 days ago · 35 km deep · 88 km away
  15. 4.078 km E of Hualien City, Taiwan · 15051 days ago · 33 km deep · 24 km away

Before

  1. 4.263 km SW of Yonakuni, Japan · 15110 days ago · 10 km deep · 14 km away
  2. 4.664 km SE of Yilan, Taiwan · 15113 days ago · 38 km deep · 56 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002fcm. Read Mon, Sep 28, 2026, 1:02 AM UTC.