QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp000363y
USGS usp000363y
27 Jun 1987, 01:17
256 km ESE of Biak, Indonesia
A magnitude 6.6 mw earthquake at 20.7 km depth.
Published location
Where is 256 km ESE of Biak, Indonesia?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
-2.164000, 138.170000
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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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Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
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Catalog fields and provenance
Event ID
usp000363y
Coordinates
-2.164, 138.17
Network
us
Significance
670