QuakeIndex

Earthquake · reviewed by a seismologist

M 4.9mb

Colima-Michoacan border region, Mexico

· 17 km deep · released about 340 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 4.9 (mb)
Depth
17 km below the surface
Felt
7 reports · strongest reported intensity VI
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1406 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 7 people have reported feeling it to USGS.

How big was it?

This earthquake released about 340 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 500× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 22× the energy of this one
  3. Magna, Utah 2020 M 5.7 16× the energy of this one
  4. This earthquake M 4.9 about 340 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 710× 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.

For this area

The largest earthquake within 50 km in our catalogue was M 7.6 on 2022-09-19 — about 11,000 times the energy of this one.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 18.2354, -103.0207. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 4.5 29 km SSW of Aguililla, Mexico
  2. 4.4 55 km W of El Habillal, Mexico
  3. 4.3 72 km WSW of El Habillal, Mexico
  4. 4.4 19 km SE of Aquila, Mexico
  5. 4.8 21 km ESE of Aquila, Mexico
  6. 6.2 18 km SE of Aquila, Mexico
  7. 4.0 56 km SE of La Placita de Morelos, Mexico
  8. 4.2 77 km W of El Habillal, Mexico
  9. 4.0 60 km SSE of La Placita de Morelos, Mexico
  10. 4.5 54 km W of El Habillal, Mexico
  11. 4.4 Colima-Michoacan border region, Mexico
  12. 4.7 41 km SE of La Placita de Morelos, Mexico
  13. 4.4 21 km SW of Aguililla, Mexico
  14. 4.1 74 km SSE of La Placita de Morelos, Mexico
  15. 4.7 31 km SSE of Coalcomán de Vázquez Pallares, Mexico

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.