QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0002wh5
USGS usp0002wh5

26 Jul 1986, 00:41

177 km W of Itoman, Japan

A magnitude 6.1 mw earthquake at 21.7 km depth.

Depth21.7 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated27 April 2022Latest timestamp stored in this record

Published location

Where is 177 km W of Itoman, Japan?

This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.

26.384000, 125.917000

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Map data © OpenStreetMap contributors

What the numbers mean

Magnitude measures event size; depth locates the source below the surface. Neither value alone establishes local damage or personal risk.

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Nearby events with a similar magnitude

M 6.1

104 km ESE of Hirara, Japan

M 6.1

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M 6.1

62 km S of Hirara, Japan

M 6.1

198 km SE of Hirara, Japan

M 6.1

103 km NNW of Hirara, Japan

M 6.1

66 km SSW of Hirara, Japan

Catalog fields and provenance
Event ID
usp0002wh5
Coordinates
26.384, 125.917
Network
us
Significance
572