M4.0 earthquake 11 km ESE of Yonakuni, Japan
A magnitude 4.0 earthquake struck 11 km ESE of Yonakuni, Japan on Mon, Apr 21, 1986, 9:00 PM JST (12:00 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.5 15 km N of Yonakuni, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.0 (mb), light
- Local time
- UTC
- 1986-04-21 12:00:24 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 24.444° N, 123.110° 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: 7 in the 60 days after this one and 94 in the 30 days before it.
After
- 4.515 km N of Yonakuni, Japan · 14764 days ago · 33 km deep · 21 km away
- 4.339 km WNW of Yonakuni, Japan · 14763 days ago · 29 km deep · 51 km away
- 4.162 km ENE of Hualien City, Taiwan · 14755 days ago · 33 km deep · 99 km away
- 4.576 km NE of Yonakuni, Japan · 14749 days ago · 72 km deep · 71 km away
- 4.850 km N of Yonakuni, Japan · 14737 days ago · 33 km deep · 53 km away
- 5.372 km SSE of Yonakuni, Japan · 14722 days ago · 39 km deep · 65 km away
- 4.841 km N of Yonakuni, Japan · 14705 days ago · 33 km deep · 46 km away
Before
- 5.162 km NE of Yonakuni, Japan · 14765 days ago · 33 km deep · 58 km away
- 5.054 km NE of Yonakuni, Japan · 14765 days ago · 29 km deep · 50 km away
- 4.429 km SE of Yonakuni, Japan · 14776 days ago · 33 km deep · 21 km away
- 4.788 km NE of Yonakuni, Japan · 14777 days ago · 11 km deep · 86 km away
- 4.361 km N of Yonakuni, Japan · 14779 days ago · 33 km deep · 65 km away
- 4.744 km NNE of Yonakuni, Japan · 14780 days ago · 30 km deep · 42 km away
- 3.944 km NNE of Yonakuni, Japan · 14782 days ago · 33 km deep · 43 km away
- 4.327 km NNW of Yonakuni, Japan · 14783 days ago · 33 km deep · 35 km away
- 4.557 km SSE of Yonakuni, Japan · 14783 days ago · 33 km deep · 52 km away
- 4.638 km NNW of Yonakuni, Japan · 14785 days ago · 33 km deep · 47 km away
- 5.039 km NNW of Yonakuni, Japan · 14786 days ago · 33 km deep · 46 km away
- 4.462 km NNE of Yonakuni, Japan · 14787 days ago · 33 km deep · 61 km away
- 4.434 km NNW of Yonakuni, Japan · 14787 days ago · 33 km deep · 41 km away
- 3.8Taiwan region · 14787 days ago · 33 km deep · 42 km away
- 4.438 km NNE of Yonakuni, Japan · 14787 days ago · 33 km deep · 38 km away
- 4.659 km NE of Yonakuni, Japan · 14788 days ago · 33 km deep · 56 km away
- 4.439 km NW of Yonakuni, Japan · 14788 days ago · 33 km deep · 50 km away
- 4.948 km N of Yonakuni, Japan · 14788 days ago · 33 km deep · 51 km away
- 4.333 km NNW of Yonakuni, Japan · 14788 days ago · 33 km deep · 42 km away
- 4.448 km NE of Yonakuni, Japan · 14789 days ago · 33 km deep · 45 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002t2v. Read Tue, Sep 22, 2026, 10:03 AM UTC.