Earthquake · Reviewed by USGS

M4.0 earthquake 112 km SSW of Ōyama, Japan

A magnitude 4.0 earthquake struck 112 km SSW of Ōyama, Japan at Apr 21, 2026, 00:59 UTC, at a depth of 323 km. The epicentre was 112 km (69 mi) SSW of Omaezaki.

Details

Magnitude	4.0 mb
Time	Apr 21, 2026, 00:59 UTC
Depth	322.9 km
Coordinates	33.650, 137.815
Felt reports	0
Tsunami flag	None
Source	USGS event page

Fig. 1The epicentre and other earthquakes within 100 km, since the day before

01 — Nearby

Nearest cities

Omaezaki112 km (69 mi)
Iwata117 km (73 mi)
Hamamatsu117 km (73 mi)
Arai117 km (73 mi)
Shima118 km (73 mi)

02 — Around it

Other earthquakes within 100 km

Other earthquakes within 100 km since the day before this event
Magnitude	Location	Distance	Depth	Time
4.7	58 km SE of Shima, Japan	59 km / 37 mi	depth 358 km	Sep 20, 13:54 UTC
4.1	89 km SSE of Shima, Japan	59 km / 37 mi	depth 363 km	Sep 17, 05:42 UTC
4.6	87 km SE of Kumano, Japan	96 km / 60 mi	depth 386 km	Jul 4, 02:56 UTC
4.2	49 km SE of Shima, Japan	69 km / 43 mi	depth 330 km	May 21, 01:06 UTC

USGS can revise magnitude and location after the first report. See magnitude vs intensity and aftershocks.