QuakeIndex

Earthquake · reviewed by a seismologist

M 4.5mw

20km W of El Sauzal, B.C., MX

· 15 km deep · released about 94 tons of TNT

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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 4.5 (mw)
Depth
15 km below the surface
Felt
4596 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 490 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 4596 people have reported feeling it to USGS.

How big was it?

This earthquake released about 94 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 1,800× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 80× the energy of this one
  3. Magna, Utah 2020 M 5.7 57× the energy of this one
  4. This earthquake M 4.5 about 94 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 200× 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 31.9305, -116.8925. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.6 32 km E of Primo Tapia, B.C., MX
  2. 2.1 19 km NNE of El Sauzal, B.C., MX
  3. 1.7 9 km W of Primo Tapia, B.C., MX
  4. 3.2 48 km SW of Primo Tapia, B.C., MX
  5. 2.0 11 km NE of El Sauzal, B.C., MX
  6. 1.9 25 km WSW of El Sauzal, B.C., MX
  7. 2.2 30 km NNE of Ensenada, B.C., MX
  8. 1.8 20 km WSW of Primo Tapia, B.C., MX
  9. 1.8 18 km WSW of Primo Tapia, B.C., MX
  10. 2.2 28km NE of Ensenada, B.C., MX
  11. 2.5 7km NE of Ensenada, B.C., MX
  12. 2.4 4 km ENE of Ensenada, B.C., MX
  13. 2.8 6km ENE of Ensenada, B.C., MX
  14. 1.9 39km SW of Rosarito, B.C., MX
  15. 2.5 7km ENE of Ensenada, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.