QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/nc71127029
USGS nc71127029

20 Dec 2021, 20:10

29km W of Petrolia, CA

A magnitude 5.7 ml earthquake at 16.5 km depth.

Depth16.5 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated22 December 2025Latest timestamp stored in this record

Published location

Where is 29km W of Petrolia, CA?

This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.

40.297833, -124.626000

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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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Nearby events with a similar magnitude

M 5.64

124 km WSW of Ferndale, California

M 5.7

85 km WSW of Ferndale, California

M 5.7

195 km WSW of Port Orford, Oregon

M 5.7

218 km W of Ferndale, California

M 5.7

174 km WSW of Port Orford, Oregon

M 5.6

26 km NNW of Willow Creek, California

Catalog fields and provenance
Event ID
nc71127029
Coordinates
40.2978333, -124.626
Network
nc
Significance
491