QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

Earthquake near Santa Barbara, CA

No earthquake was likely felt in Santa Barbara in the 24 hours to 4:21 am PST (12:21 UTC). The last one was M 2.1, 15 km (9 mi) S, at 9:33 pm PST on 4 November 2026, estimated intensity II (weak) in town. Every earthquake near Santa Barbara

This page: a magnitude 2.3 earthquake was recorded 25 km (16 mi) south-southeast of Santa Barbara, CA, at 5:26 pm PDT on 23 April 2018 (00:26 UTC), less than 1 km deep.

USGS: 21km NNW of Santa Cruz Is. (E end), CA

24 km (15 mi) SSE of Santa Barbara, CA · 112 km (69 mi) W of Los Angeles, CA

5:26 pm PDT, Apr 23, 2018 · · -0.0 km deep · released about 85 lb of TNT

Every earthquake near Santa Barbara Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ventura County 46 kmSanta Barbara County 54 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
5:26 pm PDT on 23 April 2018 ()
Where
25 km (16 mi) south-southeast of Santa Barbara, CA · earthquakes near Santa Barbara
Magnitude
M 2.3 (ml)
Depth
-0.0 km below the surface
Felt
no reports yet
Nearest
Ventura County, 46 km ENE
Nearest mapped fault
Mid-Channel fault, 2 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 3030 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 20 km (12 mi) from the epicentre. In Santa Barbara, 25 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.

Earthquakes near other towns within 30 km: Carpinteria, Summerland, Toro Canyon, Montecito, Mission Canyon, Ventura.

How big was it?

This earthquake released about 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 85 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 5.3 on 2018-04-05 — about 31,000 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.8 The 1925 Santa Barbara, California Earthquake · 21 km WNW of this epicentre
  2. 5.5 30 km SW of Channel Islands Beach, California · 25 km SSE of this epicentre
  3. 5.5 10 km NE of Toro Canyon, California · 34 km NNE of this epicentre
  4. 5.5 The 1941 Santa Barbara, California Earthquake · 14 km NNE of this epicentre
  5. 5.2 9 km SW of Channel Islands Beach, California · 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 34.2073, -119.6007. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Ventura County, CA 46 km (29 mi) ENE earthquakes near Ventura County
Santa Barbara County, CA 54 km (34 mi) NW earthquakes near Santa Barbara County

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

Aftershocks so far

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

  1. 1.9 20km NNW of Santa Cruz Is. (E end), CA
  2. 2.0 19km NNW of Santa Cruz Is. (E end), CA
  3. 1.6 19km NNW of Santa Cruz Is. (E end), CA
  4. 2.5 20km NNW of Santa Cruz Is. (E end), CA
  5. 1.6 21km NNW of Santa Cruz Is. (E end), CA
  6. 1.6 20km NNW of Santa Cruz Is. (E end), CA
  7. 1.7 13km SW of Ojai, CA
  8. 2.0 13km W of Port Hueneme, CA
  9. 1.6 6km WSW of Ojai, CA
  10. 1.7 18km W of Isla Vista, CA
  11. 2.2 22km WSW of Isla Vista, CA
  12. 2.2 15km S of Carpinteria, CA
  13. 2.0 11km WNW of Ojai, CA
  14. 1.8 7km NE of Ventura, CA
  15. 2.4 18km S of Port Hueneme, 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.