Japan earthquakes

M4.1 earthquake 52 km WNW of Yonakuni, Japan

A magnitude 4.1 earthquake struck 52 km WNW of Yonakuni, Japan on Mon, Aug 26, 1985, 11:25 AM GMT+8 (03:25 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.5 56 km ESE of Yilan, Taiwan. This one was a foreshock.

Yilan 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
4.1 (mb), light
Local time
UTC
1985-08-26 03:25:10 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
24.634° N, 122.514° 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: 10 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 4.668 km ENE of Hualien City, Taiwan · 15007 days ago · 43 km deep · 60 km away
  2. 4.554 km ESE of Yilan, Taiwan · 15007 days ago · 10 km deep · 31 km away
  3. 3.745 km SE of Yilan, Taiwan · 15006 days ago · 28 km deep · 53 km away
  4. 3.820 km N of Yonakuni, Japan · 15004 days ago · 33 km deep · 47 km away
  5. 5.114 km NW of Yonakuni, Japan · 14995 days ago · 106 km deep · 39 km away
  6. 4.972 km SW of Yonakuni, Japan · 14992 days ago · 35 km deep · 77 km away
  7. 4.049 km ESE of Yilan, Taiwan · 14985 days ago · 10 km deep · 38 km away
  8. 5.556 km ESE of Yilan, Taiwan · 14985 days ago · 18 km deep · 24 km away
  9. 4.224 km E of Yilan, Taiwan · 14971 days ago · 10 km deep · 53 km away
  10. 4.421 km NE of Hualien City, Taiwan · 14952 days ago · 33 km deep · 97 km away

Before

  1. 4.48 km N of Yilan, Taiwan · 15024 days ago · 32 km deep · 79 km away
  2. 3.738 km SSE of Yilan, Taiwan · 15028 days ago · 10 km deep · 73 km away
  3. 4.444 km SSE of Yilan, Taiwan · 15031 days ago · 10 km deep · 58 km away
  4. 4.841 km S of Yilan, Taiwan · 15031 days ago · 10 km deep · 78 km away
  5. 5.542 km SSE of Yilan, Taiwan · 15031 days ago · 10 km deep · 69 km away
  6. 4.647 km E of Yonakuni, Japan · 15035 days ago · 33 km deep · 98 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002j5c. Read Wed, Sep 30, 2026, 11:12 AM UTC.