QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0001z2b
USGS usp0001z2b
17 Oct 1983, 20:36
Azores-Cape St. Vincent Ridge
A magnitude 6.4 mw earthquake at 10 km depth.
Published location
Where is Azores-Cape St. Vincent 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.
37.588000, -17.520000
Open the interactive map ↗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.
Need a current safety answer?
Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
Continue exploring
Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
usp0001z2b
Coordinates
37.588, -17.52
Network
us
Significance
630