M4.4 earthquake 66 km SW of Yonakuni, Japan
A magnitude 4.4 earthquake struck 66 km SW of Yonakuni, Japan on Fri, Aug 7, 1987, 3:57 AM GMT+8 (19:57 UTC), 36 km (22 mi) below the surface.
A larger quake followed: M5.0 26 km E 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
- 4.4 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1987-08-06 19:57:39 UTC
- Depth
- 35.9 km (22.3 mi), shallow
- Epicenter
- 24.031° N, 122.546° 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
- FROM_LOCATION
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.944 km ESE of Yonakuni, Japan · 14299 days ago · 62 km deep · 90 km away
- 4.49 km SSE of Hualien City, Taiwan · 14282 days ago · 19 km deep · 93 km away
- 5.026 km E of Yonakuni, Japan · 14277 days ago · 79 km deep · 90 km away
- 4.3115 km S of Yonakuni, Japan · 14269 days ago · 33 km deep · 82 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00037ae. Read Sat, Oct 3, 2026, 3:22 PM UTC.