QuakeIndex

Earthquake · reviewed by a seismologist

M 6.8mww

55 km SSW of Aguililla, Mexico

· 20 km deep · released about 240 kilotons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N
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 6.8 (mww)
Depth
20 km below the surface
Felt
617 reports · strongest reported intensity VIII
Measured shaking
intensity VII (ShakeMap)
USGS impact alert
yellow
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 429 days ago

This was a strong earthquake. Damage is likely near the epicentre and it is felt over a wide area. 617 people have reported feeling it to USGS.

How big was it?

This earthquake released about 240 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 7.8 would have released about 32 times as much.

  1. San Francisco 1906 M 7.9 45× the energy of this one
  2. Ridgecrest, California 2019 M 7.1 2.8× the energy of this one
  3. Loma Prieta, California 1989 M 6.9 1.4× the energy of this one
  4. This earthquake M 6.8 about 240 kilotons of TNT
  5. Northridge, California 1994 M 6.7 this one released 1.4× more
  6. Mineral, Virginia 2011 M 5.8 this one released 32× 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 16 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 18.2633, -102.9554. Map © OpenStreetMap contributors.

Aftershocks so far

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