Japan earthquakes

M4.5 earthquake 1 km NW of Iwai, Japan

A magnitude 4.5 earthquake struck 1 km NW of Iwai, Japan on Sat, Aug 27, 2016, 10:46 PM JST (13:46 UTC), 44 km (28 mi) below the surface.

A larger quake followed: M5.3 7 km S of Sawara, 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: 4.5 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, Aug 27, 2016, 10:46 PM JST
UTC: 2016-08-27 13:46:28 UTC
Depth: 44.3 km (27.5 mi), shallow
Epicenter: 36.060° N, 139.883° E
Region: Japan
Felt reports: 26
Tsunami flag: No
Status: Reviewed by a seismologist

What happened

The USGS’s account of the effects of this earthquake.

Felt (III) at Tsuchiura and (II) at Tokyo. Also felt at Hitachinaka, Ichikawa, Kasama, Kashiwa, Kawaguchi, Kawasaki, Kuki, Musashino, Naka, Ora, Saitama, Soka and Utsunomiya. Recorded (3 JMA) in Saitama and Tochigi.

From the USGS event page for us20006ujq. U.S. Geological Survey text and figures are in the public domain.

Did you feel it?

26 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 6.3 km horizontally, 6.1 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 126°
Stations used: 84

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 12 in the 60 days after this one and 2 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us20006ujq. Read Mon, Oct 5, 2026, 12:00 PM UTC.