QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

5km NNE of Westmorland, CA

· 11 km deep · released about 800 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Imperial County 23 kmRiverside County 82 kmSan Diego 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
Magnitude
M 3.0 (ml)
Depth
11 km below the surface
Felt
11 reports · strongest reported intensity III
Nearest
Imperial County, 23 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2062 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 11 people have reported feeling it to USGS.

How big was it?

This earthquake released about 800 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 420,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 19,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 13,000× the energy of this one
  4. This earthquake M 3.0 about 800 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.

Where

Epicentre 33.0737, -115.5957. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Imperial County, CA 23 km (14 mi) W of here earthquakes near Imperial County
Riverside County, CA 82 km (51 mi) SSE of here earthquakes near Riverside County
San Diego County, CA 110 km (68 mi) E of here earthquakes near San Diego 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 10km SW of Niland, CA
  2. 1.6 10km SW of Niland, CA
  3. 1.5 9km SW of Niland, CA
  4. 1.5 8km SE of Bombay Beach, CA
  5. 1.5 20km WNW of Imperial, CA
  6. 1.9 10km SW of Niland, CA
  7. 2.5 5km SW of Salton City, CA
  8. 1.5 10km SW of Niland, CA
  9. 1.5 13km E of Ocotillo Wells, CA
  10. 1.6 12km E of Ocotillo Wells, CA
  11. 1.9 16km E of Ocotillo, CA
  12. 1.7 14km WNW of Calipatria, CA
  13. 3.3 4km ENE of Westmorland, CA
  14. 1.7 5km NE of Westmorland, CA
  15. 1.5 11km NNW 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.9 on 2020-10-01 — it released about 930 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.