M4.1 earthquake 12 km E of Mobara, Japan
A magnitude 4.1 earthquake struck 12 km E of Mobara, Japan on Fri, Dec 18, 1987, 6:05 AM JST (21:05 UTC), 51 km (32 mi) below the surface.
A larger quake followed: M4.3 19 km SE of T?gane, 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), light
- Local time
- UTC
- 1987-12-17 21:05:29 UTC
- Depth
- 50.8 km (31.6 mi), shallow
- Epicenter
- 35.416° N, 140.431° 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.
- Depth from
- FROM_LOCATION
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 4 in the 30 days before it.
After
- 4.319 km SE of T?gane, Japan · 14141 days ago · 47 km deep · 8 km away
- 4.417 km NNE of ?hara, Japan · 14138 days ago · 49 km deep · 7 km away
- 4.712 km ESE of ?hara, Japan · 14138 days ago · 36 km deep · 23 km away
- 4.211 km ENE of ?hara, Japan · 14138 days ago · 33 km deep · 14 km away
- 5.1near the east coast of Honshu, Japan · 14129 days ago · 48 km deep · 20 km away
- 4.61 km NNE of Fujisawa, Japan · 14118 days ago · 131 km deep · 86 km away
- 4.927 km SE of Tateyama, Japan · 14111 days ago · 88 km deep · 76 km away
- 5.220 km SSE of Y?kaichiba, Japan · 14102 days ago · 58 km deep · 23 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0003bc9. Read Tue, Sep 22, 2026, 4:16 PM UTC.