QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

Earthquake near Campo, CA

No earthquake was likely felt in Campo in the 24 hours to 1:47 pm PST (21:47 UTC). The last one was M 4.9, 122 km (76 mi) E, at 10:27 am PST on 3 November 2026, estimated intensity II (weak) in town; 321 felt reports to USGS. Every earthquake near Campo

This page: a magnitude 1.7 earthquake was recorded 32 km (20 mi) southeast of Campo, CA, at 8:04 pm PDT on 21 April 2023 (03:04 UTC), 18 km deep.

USGS: 32km SE of Campo, CA

96 km (60 mi) ESE of San Diego, CA

8:04 pm PDT, Apr 21, 2023 · · 18 km deep · released about 11 lb of TNT

Every earthquake near Campo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 86 kmImperial County 110 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
8:04 pm PDT on 21 April 2023 ()
Where
32 km (20 mi) southeast of Campo, CA · earthquakes near Campo
Magnitude
M 1.7 (ml)
Depth
18 km below the surface
Felt
no reports yet
Nearest
San Diego County, 86 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1299 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. In Campo, 32 km away, the estimate is intensity I (not felt). 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 11 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 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 970,000× the energy of this one
  3. Around the size people start to feel M 3.0 86× the energy of this one
  4. This earthquake M 1.7 about 11 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 4.2 on 2018-07-25 — about 5,200 times the energy of this one.

Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:

  1. 5.7 8km ESE of Ocotillo, CA · 47 km NE of this epicentre
  2. 5.6 37km ENE of Ensenada, B.C., MX · 46 km S of this epicentre
  3. 5.4 62km SSW of Progreso, B.C., MX · 48 km SE of this epicentre
  4. 5.1 40km SSW of Progreso, B.C., MX · 47 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 32.3898, -116.2447. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Diego County, CA 86 km (54 mi) NW earthquakes near San Diego County
Imperial County, CA 110 km (69 mi) NE earthquakes near Imperial County

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

Aftershocks so far

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

  1. 2.1 13 km SE of Ocotillo, CA
  2. 2.1 44 km ENE of Ensenada, B.C., MX
  3. 2.2 30 km NNE of Ensenada, B.C., MX
  4. 2.0 46 km ENE of Ensenada, B.C., MX
  5. 1.6 33 km ENE of Ensenada, B.C., MX
  6. 2.3 36 km SSE of Campo, CA
  7. 1.7 44 km ENE of Ensenada, B.C., MX
  8. 2.9 43 km ENE of Ensenada, B.C., MX
  9. 1.5 16 km ENE of Campo, CA
  10. 2.0 36 km ENE of Ensenada, B.C., MX
  11. 1.6 26 km SE of Campo, CA
  12. 1.6 29 km SE of Campo, CA
  13. 1.6 59km SE of Campo, CA
  14. 2.3 9km SSW of Ocotillo, CA
  15. 2.2 28km NE of Ensenada, B.C., MX

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.