Japan earthquakes

M5.4 earthquake 28 km N of Yonakuni, Japan

A magnitude 5.4 earthquake struck 28 km N of Yonakuni, Japan on Sat, Mar 22, 1986, 11:27 PM JST (14:27 UTC), 33 km (21 mi) below the surface.

Ishigaki forecast More in Japan

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 5.4 (Mw, moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, Mar 22, 1986, 11:27 PM JST
UTC: 1986-03-22 14:27:17 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 24.726° N, 123.015° E
Region: Japan
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

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
5.4	Mw, moment	USGS National Earthquake Information Center	Preferred · Reviewed
5.33	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.3	Mwc, centroid moment	Global CMT project	Preliminary

What happened

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

CENTROID, MOMENT TENSOR (HRV) Data Used: GDSN L.P.B.: 7S, 17C Centroid Location: Origin Time 14:27:17.9 1.1 Lat 24.46N 0.16 Lon 122.66E 0.19 Dep 15.0 FIX Half-duration 1.6 Moment Tensor; Scale 10**23 D-CM Mrr=-9.34 1.97 Mtt=7.01 1.26 Mff=2.33 2.73 Mrt=9.49 5.69 Mrf=0.44 2.99 Mtf=0.60 1.50 Principal Axes: (T) Val=11.42 Plg=25 Azm=355 (N) Val=2.28 Plg=1 Azm=86 (P) Val=-13.70 Plg=65 Azm=179 Best Double Couple:Mo=1.3*10**24 NP1:Strike=82 Dip=20 Slip=-94 NP2:Strike=266 Dip=70 Slip=-88

From the USGS event page for usp0002s3c. U.S. Geological Survey text and figures are in the public domain.

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Depth from: OPERATOR_ASSIGNED

Nearest places

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

Nearby

Within 100 km, magnitude 2.4 and up: 83 in the 60 days after this one and 55 in the 30 days before it.

After

The first 60 of 83.

Before

Earthquakes today Japan earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002s3c (also filed as gcmtb032286e, gcmt19860322142717, iscgem501219). Read Fri, Oct 2, 2026, 5:29 AM UTC.