M4.6 earthquake 7 km WNW of Tsukuba, Japan
A magnitude 4.6 earthquake struck 7 km WNW of Tsukuba, Japan on Fri, Jul 27, 1973, 11:52 PM JST (14:52 UTC), 81 km (50 mi) below the surface.
A larger quake followed: M5.1 11 km WSW of Kanuma, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.6 (mb), light
- Local time
- UTC
- 1973-07-27 14:52:22 UTC
- Depth
- 81.0 km (50.3 mi), intermediate-depth
- Epicenter
- 36.219° N, 140.019° 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
- 31
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 5 in the 60 days after this one and 5 in the 30 days before it.
After
- 4.68 km ENE of Funaishikawa, Japan · 19411 days ago · 61 km deep · 65 km away
- 4.15 km ESE of Sakai, Japan · 19391 days ago · 61 km deep · 21 km away
- 3.58 km NNW of Funaishikawa, Japan · 19390 days ago · 53 km deep · 59 km away
- 3.64 km N of Urayasu, Japan · 19388 days ago · 50 km deep · 57 km away
- 5.111 km WSW of Kanuma, Japan · 19388 days ago · 115 km deep · 49 km away
Before
- 3.36 km N of Ashikaga, Japan · 19416 days ago · 14 km deep · 55 km away
- 3.85 km ENE of Funaishikawa, Japan · 19420 days ago · 62 km deep · 61 km away
- 5.834 km ENE of ?arai, Japan · 19422 days ago · 46 km deep · 86 km away
- 4.24 km ENE of Iwai, Japan · 19436 days ago · 63 km deep · 18 km away
- 4.26 km SW of Oyama, Japan · 19438 days ago · 69 km deep · 25 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00002vw. Read Tue, Sep 22, 2026, 9:26 AM UTC.