QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem909158
USGS iscgem909158
21 Mar 1927, 15:05
Southwest Indian Ridge
A magnitude 6.4 mw earthquake at 10 km depth.
Published location
Where is Southwest Indian 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.
-33.605000, 57.685000
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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.
Need a current safety answer?
Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
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Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
iscgem909158
Coordinates
-33.605, 57.685
Network
iscgem
Significance
630