QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0001yt1
USGS usp0001yt1

3 Oct 1983, 14:33

96 km SSE of Shimoda, Japan

A magnitude 6 mw earthquake at 12.4 km depth.

Depth12.4 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated19 December 2025Latest timestamp stored in this record

Published location

Where is 96 km SSE of Shimoda, 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.

33.941000, 139.513000

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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

131 km ESE of Namie, Japan

M 6

161 km SE of Katsuura, Japan

M 6

76 km SE of Shimoda, Japan

M 6

45 km ESE of Hitachi, Japan

M 6

229 km SSE of Tateyama, Japan

M 6

7 km NNE of Kisarazu, Japan

Catalog fields and provenance
Event ID
usp0001yt1
Coordinates
33.941, 139.513
Network
us
Significance
554