QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/nc21323712
USGS nc21323712

22 Dec 2003, 19:15

10 km NE of San Simeon, California

A magnitude 6.5 mw earthquake at 8.4 km depth.

Depth8.4 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated29 March 2025Latest timestamp stored in this record

Published location

Where is 10 km NE of San Simeon, California?

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

35.700500, -121.100500

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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 6.5

1922 Parkfield, California Earthquake

M 6.45

Near Morgan Hill, California

M 6.4

1901 Parkfield, California Earthquake

M 6.4

The 1933 Long Beach, California Earthquake

M 6.6

1971 San Fernando Earthquake, California

M 6.4

Ridgecrest Earthquake Sequence

Catalog fields and provenance
Event ID
nc21323712
Coordinates
35.7005, -121.1005
Network
nc
Significance
1390