QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5mw

2km SW of Heber, CA

· 5.2 km deep · released about 3.2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Imperial County 40 kmSan Diego County 120 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 3.5 (mw)
Depth
5.2 km below the surface
Felt
15 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Imperial County, 40 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1170 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 15 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 53,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,700× the energy of this one
  4. This earthquake M 3.5 about 3.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 6.7× 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 32.7175, -115.5492. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Imperial County, CA 40 km (25 mi) SSW of here earthquakes near Imperial County
San Diego County, CA 120 km (74 mi) ESE of here earthquakes near San Diego County
Riverside County, CA 120 km (75 mi) SSE of here earthquakes near Riverside County

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

Aftershocks so far

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

  1. 1.6 17km WNW of Progreso, B.C., MX
  2. 1.5 4km SSW of Imperial, CA
  3. 2.1 3km SSW of Heber, CA
  4. 1.5 8km SSW of Holtville, CA
  5. 1.8 7km SSW of Holtville, CA
  6. 1.6 8km SSW of Holtville, CA
  7. 2.1 6km WSW of Calipatria, CA
  8. 1.5 10km E of Puebla, B.C., MX
  9. 2.2 20km ESE of Ocotillo, CA
  10. 1.8 7km NNW of Delta, B.C., MX
  11. 1.8 5km NNE of Westmorland, CA
  12. 1.8 5km NNE of Westmorland, CA
  13. 1.8 5km NW of Delta, B.C., MX
  14. 1.7 8km SSW of Holtville, CA
  15. 1.8 8km SSW of Holtville, 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 5.3 on 2021-06-05 — it released about 350 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.