Japan earthquakes

M5.6 earthquake 32 km NW of Yonakuni, Japan

A magnitude 5.6 earthquake struck 32 km NW of Yonakuni, Japan on Sat, Mar 22, 1986, 7:19 PM GMT+8 (11:19 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.8 29 km NW of Yonakuni, 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: 5.6 (Mw, moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, Mar 22, 1986, 7:19 PM GMT+8
UTC: 1986-03-22 11:19:36 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 24.681° N, 122.778° 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
5.6	Mw, moment	USGS National Earthquake Information Center	Preferred · Reviewed
5.55	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.5	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.: 11S, 18C Centroid Location: Origin Time 11:19:33.1 0.9 Lat 24.70N FIX;Lon 122.79E FIX Dep 15.0 FIX Half-duration 2.2 Moment Tensor; Scale 10**24 D-CM Mrr=-0.47 0.30 Mtt=2.59 0.20 Mff=-2.13 0.44 Mrt=1.31 0.60 Mrf=-0.14 0.48 Mtf=-0.21 0.22 Principal Axes: (T) Val=3.09 Plg=20 Azm=3 (N) Val=-0.94 Plg=69 Azm=172 (P) Val=-2.14 Plg=4 Azm=272 Best Double Couple:Mo=2.6*10**24 NP1:Strike=45 Dip=73 Slip=168 NP2:Strike=139 Dip=79 Slip=17

From the USGS event page for usp0002s2r. 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 2.6 and up: 105 in the 60 days after this one and 37 in the 30 days before it.

After

The first 60 of 105.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002s2r (also filed as gcmtb032286c, gcmt19860322111936, iscgem501164). Read Mon, Oct 5, 2026, 2:51 AM UTC.