QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp000327d
USGS usp000327d

6 Feb 1987, 13:16

72 km E of Iwaki, Japan

A magnitude 6.8 mw earthquake at 47.7 km depth.

Depth47.7 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated27 April 2022Latest timestamp stored in this record

Published location

Where is 72 km E of Iwaki, 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.

36.988000, 141.689000

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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 6.8

166 km SE of Katsuura, Japan

M 6.77

76 km E of ?arai, Japan

M 6.76

21 km SE of Shimoda, Japan

M 6.84

130 km ESE of Namie, Japan

M 6.85

80 km ESE of Kitaibaraki, Japan

M 6.74

60 km ENE of Hasaki, Japan

Catalog fields and provenance
Event ID
usp000327d
Coordinates
36.988, 141.689
Network
us
Significance
711