Japan earthquakes

M4.7 earthquake 3 km SE of Toride, Japan

A magnitude 4.7 earthquake struck 3 km SE of Toride, Japan on Mon, Dec 17, 1984, 2:55 PM JST (05:55 UTC), 84 km (52 mi) below the surface.

A larger quake followed: M5.2 6 km WNW of Ichihara, Japan. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.7 (mb), light
Local time
UTC
1984-12-17 05:55:20 UTC
Depth
84.4 km (52.4 mi), intermediate-depth
Epicenter
35.877° N, 140.106° 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.

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.7 and up: 7 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 5.26 km WNW of Ichihara, Japan · 15254 days ago · 83 km deep · 39 km away
  2. 4.37 km SE of Hitachi, Japan · 15244 days ago · 59 km deep · 94 km away
  3. 5.05 km SW of Ichihara, Japan · 15233 days ago · 79 km deep · 45 km away
  4. 4.412 km E of Mobara, Japan · 15228 days ago · 38 km deep · 59 km away
  5. 4.537 km SSE of Hasaki, Japan · 15227 days ago · 33 km deep · 96 km away
  6. 4.2near the east coast of Honshu, Japan · 15225 days ago · 67 km deep · 24 km away
  7. 4.30 km N of Fujisawa, Japan · 15202 days ago · 113 km deep · 81 km away

Before

  1. 4.722 km SW of Nikk?, Japan · 15260 days ago · 34 km deep · 97 km away
  2. 4.817 km W of Kanuma, Japan · 15262 days ago · 36 km deep · 93 km away
  3. 4.78 km SE of Yotsukaid?, Japan · 15264 days ago · 79 km deep · 33 km away
  4. 5.010 km ESE of Funaishikawa, Japan · 15266 days ago · 67 km deep · 79 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002a4n. Read Tue, Sep 22, 2026, 8:05 AM UTC.