QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

Earthquake near Calexico, CA

No earthquake was likely felt in Calexico in the 24 hours to 8:10 am PST (16:10 UTC). The last one was M 4.9, 41 km (25 mi) SE, at 10:27 am PST on 3 November 2026, estimated intensity III (weak) in town; 321 felt reports to USGS. Every earthquake near Calexico

This page: a magnitude 1.5 earthquake was recorded 3 km (2 mi) west of Calexico, CA, at 9:29 am PDT on 29 April 2023 (16:29 UTC), 13 km deep. 1 person has reported feeling it to USGS.

USGS: 3km W of Calexico, CA

9:29 am PDT, Apr 29, 2023 · · 13 km deep · released about 5.6 lb of TNT

Every earthquake near Calexico Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Imperial County 43 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
9:29 am PDT on 29 April 2023 ()
Where
3 km (2 mi) west of Calexico, CA · earthquakes near Calexico
Magnitude
M 1.5 (ml)
Depth
13 km below the surface
Felt
1 report
Nearest
Imperial County, 43 km NNE
Nearest mapped fault
Imperial fault, 13 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 1290 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 Calexico, 3 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: Heber, El Centro, Imperial, Seeley, Holtville.

How big was it?

This earthquake released about 5.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.6 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 4.9 on 2020-10-01 — about 130,000 times the energy of this one.

Before 2016, the USGS record lists 45 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.2 The 2010 Sierra El Mayor, B.C., Mexico Earthquake · 49 km SSE of this epicentre
  2. 6.9 The 1940 Imperial Valley, California Earthquake · 23 km NE of this epicentre
  3. 6.6 The 1942 Fish Creek Mountains, California Earthquake · 40 km NW of this epicentre
  4. 6.6 The 1987 Superstition Hills, California Earthquake · 48 km NW of this epicentre
  5. 6.4 The 1979 Imperial Valley Earthquake, California-Baja California · 17 km E 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 32.6808, -115.5348. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Imperial County, CA 43 km (27 mi) NNE earthquakes near Imperial County
San Diego County, CA 122 km (76 mi) WNW earthquakes near San Diego County
Riverside County, CA 124 km (77 mi) NNW earthquakes near Riverside County

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

Aftershocks so far

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

  1. 1.8 20km ESE of Ocotillo, CA
  2. 1.7 2km WNW of Calexico, CA
  3. 1.6 4km WSW of Heber, CA
  4. 2.7 6km WNW of Delta, B.C., MX
  5. 2.8 2km SW of Heber, CA
  6. 2.3 5km NE of Delta, B.C., MX
  7. 2.0 3km SSW of Heber, CA
  8. 1.6 3km SSW of Heber, CA
  9. 2.3 2km SW of Heber, CA
  10. 1.8 3km SSW of Heber, CA
  11. 1.6 3km SSW of Heber, CA
  12. 1.9 3km S of Heber, CA
  13. 1.7 7km E of Progreso, B.C., MX
  14. 1.8 3km NW of Calexico, CA
  15. 3.0 2km SSW of Heber, 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.