QuakeIndex

Earthquake · reviewed by a seismologist

M 7.6mww

35 km SSW of Aguililla, Mexico

· 27 km deep · released about 3.8 megatons 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 7.6 (mww)
Depth
27 km below the surface
Felt
1,178 reports · strongest reported intensity VIII
Measured shaking
intensity VIII (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 296 days ago

This was a major earthquake. Serious damage is likely near the epicentre. Follow official information from USGS and local authorities. 1,178 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.8 megatons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 8.6 would have released about 32 times as much.

  1. Great Alaska earthquake 1964 M 9.2 250× the energy of this one
  2. Tōhoku, Japan 2011 M 9.1 180× the energy of this one
  3. San Francisco 1906 M 7.9 2.8× the energy of this one
  4. This earthquake M 7.6 about 3.8 megatons of TNT
  5. Ridgecrest, California 2019 M 7.1 this one released 5.6× more
  6. Loma Prieta, California 1989 M 6.9 this one released 11× 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 5.1 on 2018-07-17.

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 18.4552, -102.9561. Map © OpenStreetMap contributors.

Aftershocks so far

16 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. 4.4 19 km SE of Aquila, Mexico
  4. 4.8 21 km ESE of Aquila, Mexico
  5. 6.2 18 km SE of Aquila, Mexico
  6. 4.4 Colima-Michoacan border region, Mexico
  7. 4.4 21 km SW of Aguililla, Mexico
  8. 4.7 31 km SSE of Coalcomán de Vázquez Pallares, Mexico
  9. 4.7 6 km SSW of Aguililla, Mexico
  10. 4.4 Michoacan, Mexico
  11. 4.0 24 km SSW of Coalcomán de Vázquez Pallares, Mexico
  12. 4.1 Colima-Michoacan border region, Mexico
  13. 6.8 55 km SSW of Aguililla, Mexico
  14. 4.9 33 km SSE of Coalcomán de Vázquez Pallares, Mexico
  15. 4.9 Colima-Michoacan border region, 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.