QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9ml

72km E of Maneadero, B.C., MX

· 14 km deep · released about 11 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 3.9 (ml)
Depth
14 km below the surface
Felt
4 reports · strongest reported intensity II
Measured shaking
intensity VI (ShakeMap)
USGS impact alert
green
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3110 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 11 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 15,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 680× the energy of this one
  3. Magna, Utah 2020 M 5.7 480× the energy of this one
  4. This earthquake M 3.9 about 11 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 23× 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 31.6160, -115.8162. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.2 72km ENE of Maneadero, B.C., MX
  2. 2.6 72km WSW of Alberto Oviedo Mota, B.C., MX
  3. 2.3 72km WSW of Alberto Oviedo Mota, B.C., MX
  4. 2.3 70km WSW of Alberto Oviedo Mota, B.C., MX
  5. 2.1 71km WSW of Alberto Oviedo Mota, B.C., MX
  6. 2.9 108km ESE of Maneadero, B.C., MX
  7. 2.3 65km SW of Alberto Oviedo Mota, B.C., MX
  8. 3.0 66km SW of Alberto Oviedo Mota, B.C., MX
  9. 3.1 64km SW of Alberto Oviedo Mota, B.C., MX
  10. 2.7 84km SSW of Alberto Oviedo Mota, B.C., MX
  11. 3.1 72km ENE of Maneadero, B.C., MX
  12. 2.5 80km ESE of Maneadero, B.C., MX
  13. 3.3 72km ENE of Maneadero, B.C., MX
  14. 2.8 69km WSW of Alberto Oviedo Mota, B.C., MX
  15. 2.2 70km WSW of Alberto Oviedo Mota, 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

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