QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

4km N of Simi Valley, CA

· 20 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ventura County 37 kmLos Angeles County 46 kmOrange County 113 kmKern County 115 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
20 km below the surface
Felt
no reports yet
Nearest
Ventura County, 37 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3421 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 12 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 870,000× the energy of this one
  3. Around the size people start to feel M 3.0 78× the energy of this one
  4. This earthquake M 1.7 about 12 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 34.3095, -118.7390. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Ventura County, CA 37 km (23 mi) E of here earthquakes near Ventura County
Los Angeles County, CA 46 km (28 mi) WNW of here earthquakes near Los Angeles County
Orange County, CA 113 km (70 mi) NW of here earthquakes near Orange County
Kern County, CA 115 km (72 mi) S of here earthquakes near Kern County
Santa Barbara County, CA 122 km (76 mi) ESE of here earthquakes near Santa Barbara County

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

Aftershocks so far

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

  1. 1.5 7km N of Ventura, CA
  2. 1.9 3km SE of Chatsworth, CA
  3. 1.5 8km E of Ojai, CA
  4. 1.6 15km NNE of Ojai, CA
  5. 1.9 5km NW of Westwood, CA
  6. 3.6 5km NW of Westwood, CA
  7. 2.0 17km SSE of Malibu, CA
  8. 2.1 2km N of Ojai, CA
  9. 1.5 6km SSE of Malibu, CA
  10. 1.8 17km SSE of Malibu, CA
  11. 1.6 4km S of Hollywood, CA
  12. 1.7 3km NW of Castaic, CA
  13. 3.4 3km NW of Castaic, CA
  14. 1.5 2km N of Ojai, CA
  15. 1.8 0km WNW of View Park-Windsor Hills, 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 3,800 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.