QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6ml

Earthquake near Castaic, CA

No earthquake was likely felt in Castaic in the 24 hours to 12:24 pm PST (20:24 UTC). The last one was M 2.2, 11 km (7 mi) S, at 8:32 am PDT on 18 October 2026, estimated intensity II (weak) in town; 16 felt reports to USGS. Every earthquake near Castaic

This page: a magnitude 2.6 earthquake was recorded 6 km (4 mi) west of Castaic, CA, at 3:40 pm PDT on 6 October 2025 (22:40 UTC), 17 km deep.

USGS: 6 km W of Castaic, CA

58 km (36 mi) NNW of Los Angeles, CA · 19 km (12 mi) WNW of Santa Clarita, CA

3:40 pm PDT, Oct 6, 2025 · · 17 km deep · released about 280 lb of TNT

Every earthquake near Castaic Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ventura County 43 kmLos Angeles County 51 kmKern County 96 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
3:40 pm PDT on 6 October 2025 ()
Where
6 km (4 mi) west of Castaic, CA · earthquakes near Castaic
Magnitude
M 2.6 (ml)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Ventura County, 43 km WSW
Nearest mapped fault
San Gabriel fault, 5 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 328 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 17 km (11 mi) from the epicentre. In Castaic, 6 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Valencia 9 km, intensity II · Piru 12 km, intensity II · Santa Clarita 17 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 280 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 55,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 39,000× the energy of this one
  3. Around the size people start to feel M 3.0 3.5× the energy of this one
  4. This earthquake M 2.6 about 280 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 5.1 on 2023-08-20 — about 4,600 times the energy of this one.

Before 2016, the USGS record lists 18 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.7 Northridge, California, earthquake · 34 km SSE of this epicentre
  2. 6.6 1971 San Fernando Earthquake, California · 30 km ESE of this epicentre
  3. 6.0 Tejon Pass, California · 50 km NNW of this epicentre
  4. 5.9 1km ENE of Granada Hills, California · 30 km SE of this epicentre
  5. 5.8 10km SSW of Agua Dulce, CA · 30 km ESE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 34.4880, -118.6902. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Ventura County, CA 43 km (27 mi) WSW earthquakes near Ventura County
Los Angeles County, CA 51 km (32 mi) SE earthquakes near Los Angeles County
Kern County, CA 96 km (59 mi) N earthquakes near Kern County
Orange County, CA 123 km (77 mi) SE earthquakes near Orange County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

52 earthquakes have been recorded within 50 km since this one.

  1. 2.4 8 km W of Frazier Park, CA
  2. 1.6 10 km SSW of Valencia, CA
  3. 2.5 10 km SSW of Valencia, CA
  4. 2.6 10 km SSW of Valencia, CA
  5. 1.8 2 km SE of North Hollywood, CA
  6. 1.6 2 km N of Universal City, CA
  7. 1.6 2 km NNW of Universal City, CA
  8. 2.5 10 km SSW of Valencia, CA
  9. 1.7 14 km NW of Fillmore, CA
  10. 1.9 11 km SSW of Valencia, CA
  11. 1.7 2 km NNW of Universal City, CA
  12. 2.0 8 km E of Santa Clarita, CA
  13. 1.8 13 km NW of Fillmore, CA
  14. 1.9 13 km NW of Fillmore, CA
  15. 2.8 13 km NW of Fillmore, CA

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.