M4.2 earthquake 84 km SSE of Hasaki, Japan
A magnitude 4.2 earthquake struck 84 km SSE of Hasaki, Japan on Fri, Apr 7, 1978, 9:45 AM JST (00:45 UTC), 15 km (9 mi) below the surface.
A larger quake followed: M5.0 2 km WNW 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
- 4.2 (mb), light
- Local time
- UTC
- 1978-04-07 00:45:40 UTC
- Depth
- 15.0 km (9.3 mi), shallow
- Epicenter
- 35.075° N, 141.297° 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
- 11
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 8 in the 30 days before it.
After
- 5.02 km WNW of Asahi, Japan · 17707 days ago · 57 km deep · 95 km away
- 4.516 km SSW of Hasaki, Japan · 17703 days ago · 55 km deep · 73 km away
- 4.583 km SSE of Hasaki, Japan · 17698 days ago · 33 km deep · 5 km away
- 4.5140 km ESE of ?hara, Japan · 17685 days ago · 33 km deep · 66 km away
- 4.55 km ESE of Mobara, Japan · 17660 days ago · 35 km deep · 94 km away
- 4.3135 km SE of Hasaki, Japan · 17659 days ago · 33 km deep · 69 km away
Before
- 4.780 km SSE of Hasaki, Japan · 17708 days ago · 19 km deep · 4 km away
- 5.958 km E of ?hara, Japan · 17708 days ago · 31 km deep · 29 km away
- 5.255 km E of ?hara, Japan · 17708 days ago · 38 km deep · 32 km away
- 4.378 km SSE of Hasaki, Japan · 17708 days ago · 33 km deep · 6 km away
- 4.556 km E of ?hara, Japan · 17708 days ago · 45 km deep · 29 km away
- 5.058 km E of ?hara, Japan · 17708 days ago · 27 km deep · 27 km away
- 4.666 km SE of Katsuura, Japan · 17708 days ago · 70 km deep · 57 km away
- 4.856 km SSE of Hasaki, Japan · 17709 days ago · 40 km deep · 28 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000tyd. Read Tue, Sep 29, 2026, 5:49 PM UTC.