QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0000v30
USGS usp0000v30

16 Jun 1978, 08:57

4 km WSW of Boston, Philippines

A magnitude 6 mb earthquake at 139 km depth.

Depth139 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated19 December 2025Latest timestamp stored in this record

Published location

Where is 4 km WSW of Boston, Philippines?

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

7.861000, 126.321000

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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

6 km NW of Mahanob, Philippines

M 6

28 km NE of Cortes, Philippines

M 6

32 km E of Loreto, Philippines

M 6

3 km ENE of Arteche, Philippines

M 6

19 km ESE of Lazi, Philippines

M 6

16 km NE of Cagdianao, Philippines

Catalog fields and provenance
Event ID
usp0000v30
Coordinates
7.861, 126.321
Network
us
Significance
554