QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/nc10085763
USGS nc10085763

21 Jul 1986, 15:42

The 1986 Chalfant Valley, California Earthquake

A magnitude 6.4 ml earthquake at 8.8 km depth.

Depth8.8 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated25 February 2024Latest timestamp stored in this record

Published location

Where is The 1986 Chalfant Valley, California Earthquake?

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

37.538000, -118.442833

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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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Continue exploring

Nearby events with a similar magnitude

M 6.4

Near Fernley, Nevada

M 6.5

17 km ESE of Fallon Station, Nevada

M 6.5

Monte Cristo Range, NV Earthquake

M 6.3

The 1934 Excelsior Mountains, Nevada Earthquake

M 6.2

The 1954 Rainbow Mountain, Nevada Earthquake

M 6.2

9 km SW of Aspen Springs, California

Catalog fields and provenance
Event ID
nc10085763
Coordinates
37.538, -118.4428333
Network
nc
Significance
630