QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

4km WNW of Calexico, CA

· 6.6 km deep · released about 11 lb of TNT

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10 km30 km60 km120 km N Imperial County 42 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 1.7 (ml)
Depth
6.6 km below the surface
Felt
no reports yet
Nearest
Imperial County, 42 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1244 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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 32.6940, -115.5335. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Imperial County, CA 42 km (26 mi) SSW of here earthquakes near Imperial County
San Diego County, CA 122 km (76 mi) ESE of here earthquakes near San Diego County
Riverside County, CA 123 km (77 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

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

  1. 1.7 2km WNW of Calexico, CA
  2. 1.6 4km WSW of Heber, CA
  3. 2.7 6km WNW of Delta, B.C., MX
  4. 2.8 2km SW of Heber, CA
  5. 2.3 5km NE of Delta, B.C., MX
  6. 2.0 3km SSW of Heber, CA
  7. 1.6 3km SSW of Heber, CA
  8. 2.3 2km SW of Heber, CA
  9. 1.8 3km SSW of Heber, CA
  10. 1.6 3km SSW of Heber, CA
  11. 1.9 3km S of Heber, CA
  12. 1.7 7km E of Progreso, B.C., MX
  13. 1.8 3km NW of Calexico, CA
  14. 3.0 2km SSW of Heber, CA
  15. 2.1 3km SSW of Heber, 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 4.9 on 2020-10-01 — it released about 70,000 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.