QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

6km WNW of Castaic, CA

· 16 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ventura County 44 kmLos Angeles County 51 kmKern County 94 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
Magnitude
M 1.7 (ml)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Ventura County, 44 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2888 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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.

Where

Epicentre 34.5010, -118.6822. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Ventura County, CA 44 km (28 mi) ENE of here earthquakes near Ventura County
Los Angeles County, CA 51 km (32 mi) NW of here earthquakes near Los Angeles County
Kern County, CA 94 km (58 mi) S of here earthquakes near Kern County
Orange County, CA 124 km (77 mi) NW of here earthquakes near Orange County

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

Aftershocks so far

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

  1. 1.7 14km NE of Ojai, CA
  2. 2.3 15km NE of Ojai, CA
  3. 1.5 10km N of Piru, CA
  4. 1.7 16km NE of Ojai, CA
  5. 2.0 10km S of Agua Dulce, CA
  6. 1.7 8km NNE of Malibu, CA
  7. 1.5 10km N of Piru, CA
  8. 2.0 3km ESE of Northridge, CA
  9. 2.7 3km ESE of Northridge, CA
  10. 2.1 6km SW of Valencia, CA
  11. 1.7 4km SE of San Fernando, CA
  12. 1.6 10km N of Piru, CA
  13. 1.8 14km N of Fillmore, CA
  14. 1.5 6km N of Pacoima, CA
  15. 1.8 20km SSW of Frazier Park, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.1 on 2016-03-12 — it released about 4,400 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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