QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0000phf
USGS usp0000phf
28 Jun 1977, 20:18
northern Mid-Atlantic Ridge
A magnitude 6 ms earthquake at 33 km depth.
Published location
Where is northern Mid-Atlantic Ridge?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
22.615000, -45.111000
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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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Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
usp0000phf
Coordinates
22.615, -45.111
Network
us
Significance
554