QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

14km SW of Westmorland, CA

· 9.8 km deep · released about 47 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Imperial County 36 kmRiverside County 91 kmSan Diego County 98 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 2.1 (ml)
Depth
9.8 km below the surface
Felt
no reports yet
Nearest
Imperial County, 36 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3182 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 47 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 320,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 20× the energy of this one
  4. This earthquake M 2.1 about 47 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 32.9490, -115.7252. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Imperial County, CA 36 km (22 mi) WSW of here earthquakes near Imperial County
Riverside County, CA 91 km (56 mi) SSE of here earthquakes near Riverside County
San Diego County, CA 98 km (61 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

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

  1. 2.3 8km S of Brawley, CA
  2. 1.7 7km NE of Imperial, CA
  3. 1.9 8km NE of Imperial, CA
  4. 2.1 8km S of Brawley, CA
  5. 1.6 14km WNW of Progreso, B.C., MX
  6. 2.4 17km ESE of Ocotillo, CA
  7. 1.9 5km NNE of Imperial, CA
  8. 1.5 6km S of Brawley, CA
  9. 2.0 12km NW of Progreso, B.C., MX
  10. 1.5 8km W of Progreso, B.C., MX
  11. 2.0 5km S of Brawley, CA
  12. 1.8 3km NNW of El Centro, CA
  13. 1.7 16km W of Imperial, CA
  14. 2.7 16km W of Imperial, CA
  15. 2.3 16km W of Imperial, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.3 on 2016-09-27 — it released about 2,000 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.