M5.5 earthquake 6 km S of Ichihara, Japan
A magnitude 5.5 earthquake struck 6 km S of Ichihara, Japan on Thu, Sep 25, 1980, 2:59 AM JST (17:59 UTC), 74 km (46 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.5 (mb), moderate
- Local time
- UTC
- 1980-09-24 17:59:48 UTC
- Depth
- 74.0 km (46.0 mi), intermediate-depth
- Epicenter
- 35.460° N, 140.080° E
- Region
- Japan
- Strongest shaking
- IV, light shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- IV, light shaking
- Peak ground acceleration
- 3.5% of gravity
- Peak ground velocity
- 0.5 cm/s
- Map
- Automatic
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
- 41
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.5 and up: 7 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.97 km WSW of Ichihara, Japan · 16799 days ago · 76 km deep · 8 km away
- 4.77 km SW of Ichihara, Japan · 16799 days ago · 75 km deep · 5 km away
- 4.75 km E of Ishige, Japan · 16787 days ago · 82 km deep · 74 km away
- 4.69 km W of ?ami, Japan · 16780 days ago · 78 km deep · 14 km away
- 4.78 km W of Hasaki, Japan · 16769 days ago · 62 km deep · 67 km away
- 4.65 km ENE of Shiroi, Japan · 16753 days ago · 58 km deep · 41 km away
- 4.23 km WSW of Ushiku, Japan · 16746 days ago · 80 km deep · 55 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00019yn (also filed as iscgem639187). Read Tue, Sep 22, 2026, 9:20 AM UTC.