M4.1 earthquake 2 km SE of Mito, Japan
A magnitude 4.1 earthquake struck 2 km SE of Mito, Japan on Mon, Oct 28, 1985, 11:16 PM JST (14:16 UTC), 83 km (51 mi) below the surface.
A larger quake followed: M4.8 1 km WSW of Iwai, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.1 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1985-10-28 14:16:16 UTC
- Depth
- 82.8 km (51.4 mi), intermediate-depth
- Epicenter
- 36.329° N, 140.468° E
- Region
- Japan
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
What happened
The USGS’s account of the effects of this earthquake.
Felt (I JMA) at Mito.
From the USGS event page for usp0002m7j. U.S. Geological Survey text and figures are in the public domain.
Did you feel it?
No one has reported feeling this quake to the USGS.
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
- 4.319 km ESE of Takahagi, Japan · 14927 days ago · 64 km deep · 56 km away
- 4.515 km SE of Hasaki, Japan · 14924 days ago · 58 km deep · 88 km away
- 4.81 km WSW of Iwai, Japan · 14924 days ago · 61 km deep · 61 km away
- 3.96 km E of Hasaki, Japan · 14921 days ago · 64 km deep · 77 km away
- 4.14 km SSW of Tsukuba, Japan · 14910 days ago · 89 km deep · 40 km away
- 4.721 km N of Kuroiso, Japan · 14900 days ago · 35 km deep · 99 km away
Before
- 4.310 km S of Okunoya, Japan · 14950 days ago · 78 km deep · 17 km away
- 4.31 km SSW of Koshigaya, Japan · 14959 days ago · 74 km deep · 80 km away
- 5.09 km SE of Yotsukaid?, Japan · 14960 days ago · 56 km deep · 86 km away
- 4.880 km ESE of Takahagi, Japan · 14962 days ago · 33 km deep · 93 km away
- 5.057 km ESE of Kitaibaraki, Japan · 14964 days ago · 41 km deep · 88 km away
- 4.37 km ENE of Shiroi, Japan · 14965 days ago · 88 km deep · 64 km away
- 4.36 km SSW of Ry?gasaki, Japan · 14972 days ago · 91 km deep · 60 km away
- 5.92 km NE of Shiroi, Japan · 14972 days ago · 85 km deep · 66 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002m7j. Read Thu, Oct 1, 2026, 4:57 PM UTC.