Japan earthquakes

M4.8 earthquake 56 km SSE of Hasaki, Japan

A magnitude 4.8 earthquake struck 56 km SSE of Hasaki, Japan on Thu, Apr 6, 1978, 12:34 AM JST (15:34 UTC), 40 km (25 mi) below the surface.

A larger quake followed: M5.0 58 km E of ?hara, Japan. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.8 (mb), light
Local time
UTC
1978-04-05 15:34:38 UTC
Depth
40.0 km (24.9 mi), shallow
Epicenter
35.275° N, 141.102° 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
42

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.8 and up: 14 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 4.666 km SE of Katsuura, Japan · 17701 days ago · 70 km deep · 66 km away
  2. 5.058 km E of ?hara, Japan · 17701 days ago · 27 km deep · 13 km away
  3. 4.556 km E of ?hara, Japan · 17701 days ago · 45 km deep · 14 km away
  4. 4.378 km SSE of Hasaki, Japan · 17701 days ago · 33 km deep · 22 km away
  5. 5.255 km E of ?hara, Japan · 17701 days ago · 38 km deep · 10 km away
  6. 5.958 km E of ?hara, Japan · 17701 days ago · 31 km deep · 10 km away
  7. 4.780 km SSE of Hasaki, Japan · 17701 days ago · 19 km deep · 25 km away
  8. 4.284 km SSE of Hasaki, Japan · 17701 days ago · 15 km deep · 28 km away
  9. 5.02 km WNW of Asahi, Japan · 17700 days ago · 57 km deep · 66 km away
  10. 4.516 km SSW of Hasaki, Japan · 17696 days ago · 55 km deep · 44 km away
  11. 4.583 km SSE of Hasaki, Japan · 17691 days ago · 33 km deep · 29 km away
  12. 4.5140 km ESE of ?hara, Japan · 17678 days ago · 33 km deep · 94 km away
  13. 4.55 km ESE of Mobara, Japan · 17653 days ago · 35 km deep · 70 km away
  14. 4.3135 km SE of Hasaki, Japan · 17652 days ago · 33 km deep · 91 km away

Before

  1. 4.747 km NE of Hasaki, Japan · 17730 days ago · 42 km deep · 84 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000txm. Read Tue, Sep 22, 2026, 4:03 PM UTC.