QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp00047jt
USGS usp00047jt

6 Apr 1990, 15:57

197 km E of Saipan, Northern Mariana Islands

A magnitude 6.3 mw earthquake at 15.5 km depth.

Depth15.5 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated28 April 2022Latest timestamp stored in this record

Published location

Where is 197 km E of Saipan, Northern Mariana Islands?

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

15.177000, 147.596000

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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 6.3

Mariana Islands region

M 6.31

215 km ENE of Saipan, Northern Mariana Islands

M 6.1

Mariana Islands region

M 6

Mariana Islands region

M 5.9

Mariana Islands region

M 7

233 km ESE of Saipan, Northern Mariana Islands

Catalog fields and provenance
Event ID
usp00047jt
Coordinates
15.177, 147.596
Network
us
Significance
611