Japan earthquakes

M5.8 earthquake 29 km NW of Yonakuni, Japan

A magnitude 5.8 earthquake struck 29 km NW of Yonakuni, Japan on Sat, Mar 22, 1986, 8:06 PM GMT+8 (12:06 UTC), 33 km (21 mi) below the surface.

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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: 5.8 (Mw, moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, Mar 22, 1986, 8:06 PM GMT+8
UTC: 1986-03-22 12:06:33 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 24.669° N, 122.814° E
Region: Japan
Strongest shaking: V, moderate shaking
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
5.8	Mw, moment	USGS National Earthquake Information Center	Preferred · Reviewed
5.76	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.8	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.: 12S, 22C Centroid Location: Origin Time 12:06:31.2 0.6 Lat 25.03N 0.09 Lon 122.31E 0.14 Dep 15.0 FIX Half-duration 2.6 Moment Tensor; Scale 10**24 D-CM Mrr=-3.29 0.43 Mtt=4.24 0.29 Mff=-0.95 0.59 Mrt=-2.78 1.40 Mrf=-1.64 0.72 Mtf=-1.84 0.35 Principal Axes: (T) Val=5.42 Plg=15 Azm=192 (N) Val=-0.13 Plg=30 Azm=93 (P) Val=-5.29 Plg=56 Azm=306 Best Double Couple:Mo=5.4*10**24 NP1:Strike=317 Dip=40 Slip=-39 NP2:Strike=79 Dip=66 Slip=-123

From the USGS event page for usp0002s2w. U.S. Geological Survey text and figures are in the public domain.

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: V, moderate shaking
Peak ground acceleration: 5.6% of gravity
Peak ground velocity: 1.2 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

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 2.8 and up: 100 in the 60 days after this one and 42 in the 30 days before it.

After

The first 60 of 100.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002s2w (also filed as gcmtb032286d, gcmt19860322120633, iscgem501185). Read Thu, Oct 1, 2026, 2:33 PM UTC.