QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0001n8w
USGS usp0001n8w

4 Jul 1982, 02:20

west of the Bonin Islands, Japan

A magnitude 7.1 mw earthquake at 536 km depth.

Depth536 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated28 April 2022Latest timestamp stored in this record

Published location

Where is west of the Bonin Islands, 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.

27.929000, 136.967000

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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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Continue exploring

Nearby events with a similar magnitude

M 6.7

Izu Islands, Japan region

M 6.35

97 km SSW of Muroto-misakicho, Japan

M 6.11

179 km ESE of Nichinan, Japan

M 6

southeast of Shikoku, Japan

M 5.8

166 km E of Nishinoomote, Japan

M 5.3

262 km SSE of Muroto-misakicho, Japan

Catalog fields and provenance
Event ID
usp0001n8w
Coordinates
27.929, 136.967
Network
us
Significance
776