QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

Earthquake near Grover Beach, CA

No earthquake was likely felt in Grover Beach in the 24 hours to 4:28 am PST (12:28 UTC). The last one was M 2.3, 6 km (4 mi) N, at 6:27 pm PST on 14 December 2025, estimated intensity II (weak) in town; 25 felt reports to USGS. Every earthquake near Grover Beach

This page: a magnitude 2.4 earthquake was recorded 50 km (31 mi) southwest of Grover Beach, CA, at 10:49 am PDT on 26 April 2022 (17:49 UTC), 17 km deep.

USGS: 44km WSW of Guadalupe, CA

53 km (33 mi) WSW of Santa Maria, CA

10:49 am PDT, Apr 26, 2022 · · 17 km deep · released about 130 lb of TNT

Every earthquake near Grover Beach Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Luis Obispo County 83 kmSanta Barbara 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
10:49 am PDT on 26 April 2022 ()
Where
50 km (31 mi) southwest of Grover Beach, CA · earthquakes near Grover Beach
Magnitude
M 2.4 (md)
Depth
17 km below the surface
Felt
no reports yet
Nearest
San Luis Obispo County, 83 km NE
Nearest mapped fault
Hosgri fault, 22 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 1661 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 13 km (8 mi) from the epicentre. In Grover Beach, 50 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.

How big was it?

This earthquake released about 130 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 80,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.2× the energy of this one
  4. This earthquake M 2.4 about 130 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 6.9 The 1927 Lompoc, California Earthquake · 31 km ESE of this epicentre
  2. 5.8 87 km W of Vandenberg Air Force Base, California · 46 km WSW of this epicentre
  3. 5.4 77km WSW of Vandenberg Air Force Base, CA · 38 km SW 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 34.8038, -121.0083. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Luis Obispo County, CA 83 km (51 mi) NE earthquakes near San Luis Obispo County
Santa Barbara County, CA 94 km (58 mi) ESE earthquakes near Santa Barbara County

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

Aftershocks so far

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

  1. 1.8 26 km W of Lompoc, CA
  2. 1.9 16 km SSW of Baywood-Los Osos, CA
  3. 1.8 8 km WSW of Orcutt, CA
  4. 1.7 27 km WSW of Lompoc, CA
  5. 2.1 40 km SW of Baywood-Los Osos, CA
  6. 2.0 34 km WSW of Lompoc, CA
  7. 2.2 17 km SSW of Avila Beach, CA
  8. 2.4 62 km W of Vandenberg Air Force Base, CA
  9. 1.6 14 km W of Lompoc, CA
  10. 1.8 27 km W of Guadalupe, CA
  11. 2.0 34 km WSW of Guadalupe, CA
  12. 2.4 33 km WSW of Vandenberg Air Force Base, CA
  13. 2.0 17 km W of Vandenberg Air Force Base, CA
  14. 1.6 22 km SW of Vandenberg Air Force Base, CA
  15. 2.1 36 km SW of Lompoc, 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.