M5.5 earthquake 171 km S of Yonakuni, Japan

A magnitude 5.5 earthquake struck 171 km S of Yonakuni, Japan on Wed, Jun 25, 1975, 8:28 AM GMT+9 (23:28 UTC), 13 km (8 mi) below the surface.

Map

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

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
5.5	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed
5.47	Mw, moment	ISC-GEM global catalog	Final · ±0.2

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 2.5 and up: 2 in the 60 days after this one and 5 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event usp0000brx (also filed as iscgem728178). Read Sun, Oct 4, 2026, 9:05 AM UTC.