M3.8 earthquake 20 km N of Yonakuni, Japan
A magnitude 3.8 earthquake struck 20 km N of Yonakuni, Japan on Sun, Sep 1, 1985, 6:57 PM GMT+8 (10:57 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.5 56 km ESE of Yilan, Taiwan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.8 (mb), minor
- Local time
- UTC
- 1985-09-01 10:57:19 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 24.654° N, 122.975° 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: 8 in the 60 days after this one and 5 in the 30 days before it.
After
- 5.114 km NW of Yonakuni, Japan · 14995 days ago · 106 km deep · 14 km away
- 4.972 km SW of Yonakuni, Japan · 14991 days ago · 35 km deep · 89 km away
- 4.049 km ESE of Yilan, Taiwan · 14984 days ago · 10 km deep · 84 km away
- 5.556 km ESE of Yilan, Taiwan · 14984 days ago · 18 km deep · 71 km away
- 3.742 km W of Ishigaki, Japan · 14973 days ago · 33 km deep · 82 km away
- 4.224 km E of Yilan, Taiwan · 14970 days ago · 10 km deep · 99 km away
- 4.017 km W of Yonakuni, Japan · 14948 days ago · 93 km deep · 24 km away
- 4.149 km ESE of Yilan, Taiwan · 14946 days ago · 10 km deep · 79 km away
Before
- 3.745 km SE of Yilan, Taiwan · 15005 days ago · 28 km deep · 98 km away
- 4.554 km ESE of Yilan, Taiwan · 15006 days ago · 10 km deep · 76 km away
- 4.668 km ENE of Hualien City, Taiwan · 15006 days ago · 43 km deep · 92 km away
- 4.152 km WNW of Yonakuni, Japan · 15010 days ago · 10 km deep · 47 km away
- 4.965 km NE of Yonakuni, Japan · 15020 days ago · 118 km deep · 56 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002jb6. Read Tue, Sep 29, 2026, 11:46 PM UTC.