QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem897814
USGS iscgem897814

11 Apr 1947, 15:29

86 km W of Basco, Philippines

A magnitude 6.4 mw earthquake at 30 km depth.

Depth30 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated26 April 2022Latest timestamp stored in this record

Published location

Where is 86 km W of Basco, 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.

20.437000, 121.137000

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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 6.37

87 km WSW of Hengchun, Taiwan

M 6.4

36 km E of Awallan, Philippines

M 6.34

62 km ENE of Hengchun, Taiwan

M 6.4

119 km SSW of Hengchun, Taiwan

M 6.4

22 km SSE of Basco, Philippines

M 6.4

11 km E of Dolores, Philippines

Catalog fields and provenance
Event ID
iscgem897814
Coordinates
20.437, 121.137
Network
iscgem
Significance
624