QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp00034cp
USGS usp00034cp

22 Apr 1987, 21:13

62 km E of Iwaki, Japan

A magnitude 6.7 mw earthquake at 30.3 km depth.

Depth30.3 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated27 April 2022Latest timestamp stored in this record

Published location

Where is 62 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.

37.155000, 141.573000

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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 6.7

143 km SE of Katsuura, Japan

M 6.7

71 km E of Namie, Japan

M 6.7

10 km SW of Mobara, Japan

M 6.7

123 km E of Namie, Japan

M 6.71

8 km S of Ninomiya, Japan

M 6.69

96 km ENE of Hasaki, Japan

Catalog fields and provenance
Event ID
usp00034cp
Coordinates
37.155, 141.573
Network
us
Significance
691