QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

2km SW of Heber, CA

· 10 km deep · released about 14 lb of TNT

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10 km30 km60 km120 km N Imperial County 40 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 1.8 (ml)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Imperial County, 40 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1243 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 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 32.7178, -115.5402. 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 (75 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. 1.7 3km SSW of Heber, CA
  2. 3.5 2km SW of Heber, CA
  3. 2.2 2km SSW of Heber, CA
  4. 1.6 3km SW of Heber, CA
  5. 1.5 3km SSW of Heber, CA
  6. 1.7 3km WNW of Calexico, CA
  7. 1.9 3km SSW of Heber, CA
  8. 1.6 2km SW of Heber, CA
  9. 2.0 4km NW of Delta, B.C., MX
  10. 1.7 2km WSW of Heber, CA
  11. 2.2 4km SSW of Heber, CA
  12. 1.6 6km NNE of Westmorland, CA
  13. 2.1 3km SSW of Heber, CA
  14. 2.5 2km SW of Heber, CA
  15. 1.8 20km ESE of Ocotillo, 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 170,000 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.