QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

20km SSE of Santa Cruz Is. (E end), CA

· 1.9 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ventura County 61 kmSanta Barbara County 93 kmLos Angeles County 113 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 2.1 (ml)
Depth
1.9 km below the surface
Felt
no reports yet
Nearest
Ventura County, 61 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2001 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 38 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 33.8713, -119.4285. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Ventura County, CA 61 km (38 mi) SSW of here earthquakes near Ventura County
Santa Barbara County, CA 93 km (58 mi) SE of here earthquakes near Santa Barbara County
Los Angeles County, CA 113 km (70 mi) WSW of here earthquakes near Los Angeles County

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

Aftershocks so far

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

  1. 2.1 18km WNW of Malibu, CA
  2. 1.9 16km WSW of Santa Cruz Is. (E end), CA
  3. 1.9 11km S of Camarillo, CA
  4. 1.6 17km WNW of Malibu, CA
  5. 2.1 8km SW of Camarillo, CA
  6. 1.7 20km SSE of Port Hueneme, CA
  7. 2.4 19km SSE of Port Hueneme, CA
  8. 1.9 18km SSE of Port Hueneme, CA
  9. 2.3 16km SSE of Port Hueneme, CA
  10. 2.2 25km N of Santa Barbara Is., CA
  11. 2.4 19km SSE of Port Hueneme, CA
  12. 2.4 19km SSE of Port Hueneme, CA
  13. 2.5 20km SSE of Port Hueneme, CA
  14. 1.9 18km SSW of Santa Cruz Is. (E end), CA
  15. 1.8 20km NNW of Santa Cruz Is. (E end), 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 5.3 on 2018-04-05 — it released about 68,000 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.