QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

Earthquake near Calexico, CA

No earthquake was likely felt in Calexico in the 24 hours to 6:54 am PST (14:54 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 1.6 earthquake was recorded in Calexico, CA, at 4:27 am PDT on 11 September 2016 (11:27 UTC), 2.2 km deep.

USGS: 1km NW of Calexico, CA

4:27 am PDT, Sep 11, 2016 · · 2.2 km deep · released about 8.1 lb of TNT

Every earthquake near Calexico Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Imperial County 42 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
4:27 am PDT on 11 September 2016 ()
Where
in Calexico, CA · earthquakes near Calexico
Magnitude
M 1.6 (ml)
Depth
2.2 km below the surface
Felt
no reports yet
Nearest
Imperial County, 42 km NNE
Nearest mapped fault
Imperial fault, 11 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 3713 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 11 km (7 mi) from the epicentre. 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.

Likely felt in: Calexico in town, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 8.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,300,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 8.1 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 4.0 on 2016-07-31 — about 4,100 times the energy of this one.

Before 2016, the USGS record lists 46 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 · 21 km NNE of this epicentre
  3. 6.6 The 1942 Fish Creek Mountains, California Earthquake · 42 km NW of this epicentre
  4. 6.6 The 1987 Superstition Hills, California Earthquake · 49 km NW of this epicentre
  5. 6.4 The 1979 Imperial Valley Earthquake, California-Baja California · 14 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 32.6855, -115.5045. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Imperial County, CA 42 km (26 mi) NNE earthquakes near Imperial County
San Diego County, CA 125 km (77 mi) WNW earthquakes near San Diego County
Riverside County, CA 125 km (78 mi) NNW earthquakes near Riverside County

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

Aftershocks so far

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

  1. 2.1 8km NNE of Imperial, CA
  2. 1.7 20km ESE of Ocotillo, CA
  3. 2.0 8km S of Brawley, CA
  4. 1.7 5km SE of Brawley, CA
  5. 2.7 6km NNE of Westmorland, CA
  6. 2.3 6km NNE of Westmorland, CA
  7. 1.8 11km WSW of Puebla, B.C., MX
  8. 2.2 23km W of Delta, B.C., MX
  9. 1.6 9km N of Westmorland, CA
  10. 1.5 4km WSW of Brawley, CA
  11. 1.9 6km NW of Delta, B.C., MX
  12. 1.6 9km SSW of Holtville, CA
  13. 2.6 7km NNW of Delta, B.C., MX
  14. 1.6 11km NW of Progreso, B.C., MX
  15. 1.5 10km W of Progreso, 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.