M4.7 earthquake 15 km SSE of Asahi, Japan
A magnitude 4.7 earthquake struck 15 km SSE of Asahi, Japan on Mon, Oct 22, 1973, 4:40 AM JST (19:40 UTC), 60 km (37 mi) below the surface.
A larger quake followed: M4.9 15 km SSE of Asahi, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.7 (mb), light
- Local time
- UTC
- 1973-10-21 19:40:18 UTC
- Depth
- 60.0 km (37.3 mi), shallow
- Epicenter
- 35.581° N, 140.709° 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.
- Stations used
- 37
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.7 and up: 2 in the 60 days after this one and 6 in the 30 days before it.
After
- 4.013 km SSW of Hasaki, Japan · 19328 days ago · 53 km deep · 8 km away
- 4.915 km SSE of Asahi, Japan · 19321 days ago · 57 km deep · 4 km away
Before
- 3.953 km E of ?arai, Japan · 19340 days ago · 48 km deep · 96 km away
- 4.16 km ESE of Asahi, Japan · 19345 days ago · 59 km deep · 13 km away
- 4.01 km SW of Asahi, Japan · 19349 days ago · 61 km deep · 16 km away
- 5.62 km NNE of Y?kaichiba, Japan · 19349 days ago · 56 km deep · 20 km away
- 5.92 km ENE of Narut?, Japan · 19350 days ago · 62 km deep · 24 km away
- 4.137 km ENE of Kashima-shi, Japan · 19352 days ago · 59 km deep · 64 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00003w4. Read Tue, Sep 22, 2026, 9:16 AM UTC.