M4.2 earthquake 4 km ENE of Iwai, Japan
A magnitude 4.2 earthquake struck 4 km ENE of Iwai, Japan on Sat, Jul 7, 1973, 6:11 AM JST (21:11 UTC), 63 km (39 mi) below the surface.
A larger quake followed: M5.8 34 km ENE of ?arai, 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, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1973-07-06 21:11:28 UTC
- Depth
- 63.0 km (39.1 mi), shallow
- Epicenter
- 36.065° N, 139.951° 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
- 16
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 5 in the 30 days before it.
After
- 5.834 km ENE of ?arai, Japan · 19432 days ago · 46 km deep · 97 km away
- 3.85 km ENE of Funaishikawa, Japan · 19431 days ago · 62 km deep · 76 km away
- 3.36 km N of Ashikaga, Japan · 19426 days ago · 14 km deep · 58 km away
- 4.67 km WNW of Tsukuba, Japan · 19425 days ago · 81 km deep · 18 km away
- 4.68 km ENE of Funaishikawa, Japan · 19421 days ago · 61 km deep · 79 km away
- 4.15 km ESE of Sakai, Japan · 19401 days ago · 61 km deep · 9 km away
- 3.58 km NNW of Funaishikawa, Japan · 19400 days ago · 53 km deep · 75 km away
- 3.64 km N of Urayasu, Japan · 19399 days ago · 50 km deep · 40 km away
- 5.111 km WSW of Kanuma, Japan · 19398 days ago · 115 km deep · 58 km away
Before
- 4.26 km SW of Oyama, Japan · 19448 days ago · 69 km deep · 28 km away
- 5.24 km ESE of Funaishikawa, Japan · 19463 days ago · 65 km deep · 73 km away
- 4.62 km N of Fujishiro, Japan · 19466 days ago · 76 km deep · 21 km away
- 4.71 km ENE of Shiroi, Japan · 19473 days ago · 77 km deep · 31 km away
- 4.84 km NE of Ishige, Japan · 19474 days ago · 80 km deep · 10 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00002kc. Read Fri, Oct 2, 2026, 3:34 PM UTC.