QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp00022ud
USGS usp00022ud

21 Mar 1984, 08:27

Mid-Indian Ridge

A magnitude 6.1 mw earthquake at 10 km depth.

Depth10 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated27 April 2022Latest timestamp stored in this record

Published location

Where is Mid-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.

-43.950000, 77.915000

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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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Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.

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Continue exploring

Nearby events with a similar magnitude

M 5.2

Mid-Indian Ridge

M 5

Mid-Indian Ridge

Catalog fields and provenance
Event ID
usp00022ud
Coordinates
-43.95, 77.915
Network
us
Significance
572