QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mw

6km NNW of Delta, B.C., MX

· 12 km deep · released about 17 tons of TNT

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10 km30 km60 km120 km N Imperial County 72 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
Magnitude
M 4.0 (mw)
Depth
12 km below the surface
Felt
3 reports · strongest reported intensity III
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Nearest
Imperial County, 72 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1422 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 17 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 10,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 450× the energy of this one
  3. Magna, Utah 2020 M 5.7 320× the energy of this one
  4. This earthquake M 4.0 about 17 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 35× more

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.

Where

Epicentre 32.4063, -115.2252. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Imperial County, CA 72 km (44 mi) S of here earthquakes near Imperial County

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

Aftershocks so far

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

  1. 2.0 20km W of Delta, B.C., MX
  2. 1.7 8km W of Holtville, CA
  3. 2.1 4km NNW of Delta, B.C., MX
  4. 2.0 7km SW of Holtville, CA
  5. 2.2 7km NNE of Delta, B.C., MX
  6. 3.2 6km W of Alberto Oviedo Mota, B.C., MX
  7. 2.5 13km WSW of Delta, B.C., MX
  8. 2.0 10km ESE of Puebla, B.C., MX
  9. 2.1 11km NNW of Delta, B.C., MX
  10. 2.0 9km NW of Delta, B.C., MX
  11. 2.3 12km NW of Delta, B.C., MX
  12. 1.5 9km WSW of Progreso, B.C., MX
  13. 1.8 8km SW of Holtville, CA
  14. 1.6 8km SSW of Holtville, CA
  15. 2.4 9km W of Alberto Oviedo Mota, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.8 on 2018-11-19 — it released about 15 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.