QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

31km SE of San Clemente Is. (SE tip), CA

Yes. A magnitude 1.8 earthquake was recorded 31km SE of San Clemente Is. (SE tip), CA, 94 km (58 mi) WSW of San Diego, CA, at 12:04 pm PDT on 23 June 2022 (19:04 UTC), 20 km deep.

94 km (58 mi) WSW of San Diego, CA

· 20 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N
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 1.8 (ml)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Orange County, 121 km NNE
Nearest mapped fault
San Clemente fault, under 1 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 1603 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. 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 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× the energy of this one
  4. This earthquake M 1.8 about 16 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 4.3 on 2019-06-05 — about 5,200 times the energy of this one.

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

  1. 5.8 11km NNE of San Clemente Is. (SE tip), CA · 37 km NNW of this epicentre
  2. 5.5 The 1986 Oceanside, California Earthquake · 44 km NNE of this epicentre
  3. 5.2 42km SSW of San Clemente Is. (SE tip), CA · 46 km WSW 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 32.6258, -118.1130. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 121 km (75 mi) NNE earthquakes near Orange County

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

Aftershocks so far

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

  1. 1.8 50 km WSW of Encinitas, CA
  2. 1.6 42 km WSW of Encinitas, CA
  3. 2.6 6 km SE of San Clemente Is. (SE tip), CA
  4. 3.0 25 km SE of San Clemente Is. (SE tip), CA
  5. 2.7 42 km NE of San Clemente Is. (SE tip), CA
  6. 2.3 6 km SSE of San Clemente Is. (SE tip), CA
  7. 3.0 8 km SSE of San Clemente Is. (SE tip), CA
  8. 2.0 41 km NE of San Clemente Is. (SE tip), CA
  9. 2.5 43 km NE of San Clemente Is. (SE tip), CA
  10. 3.2 42 km NE of San Clemente Is. (SE tip), CA
  11. 1.9 47 km WSW of Carlsbad, CA
  12. 2.2 48 km WSW of Coronado, CA
  13. 1.7 46 km ENE of San Clemente Is. (SE tip), CA
  14. 2.0 43 km ENE of San Clemente Is. (SE tip), CA
  15. 1.6 43 km ENE of San Clemente Is. (SE tip), 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.