QuakeIndex

Earthquake · reviewed by a seismologist

M 6.6mww

203 km SW of La Cruz de Loreto, Mexico

· 10 km deep · released about 120 kilotons 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 6.6 (mww)
Depth
10 km below the surface
Felt
11 reports · strongest reported intensity III
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 1517 days ago

This was a strong earthquake. Damage is likely near the epicentre and it is felt over a wide area. 11 people have reported feeling it to USGS.

How big was it?

This earthquake released about 120 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 7.6 would have released about 32 times as much.

  1. Ridgecrest, California 2019 M 7.1 5.6× the energy of this one
  2. Loma Prieta, California 1989 M 6.9 2.8× the energy of this one
  3. Northridge, California 1994 M 6.7 1.4× the energy of this one
  4. This earthquake M 6.6 about 120 kilotons of TNT
  5. Mineral, Virginia 2011 M 5.8 this one released 16× more
  6. Magna, Utah 2020 M 5.7 this one released 22× 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 5.3 on 2016-01-08.

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 18.8239, -106.9337. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 5.5 201 km SW of José María Morelos, Mexico
  2. 4.3 165 km SW of Campo Acosta, Mexico
  3. 5.4 180 km SW of José María Morelos, Mexico
  4. 5.9 240 km SW of La Cruz de Loreto, Mexico
  5. 5.9 225 km SW of José María Morelos, Mexico
  6. 4.0 221 km SW of La Cruz de Loreto, Mexico
  7. 4.5 off the coast of Jalisco, Mexico
  8. 4.4 184 km WSW of José María Morelos, Mexico
  9. 6.0 213 km SW of La Cruz de Loreto, Mexico
  10. 4.3 211 km SW of José María Morelos, Mexico
  11. 4.0 206 km SW of La Cruz de Loreto, Mexico
  12. 5.8 224 km SW of La Cruz de Loreto, Mexico
  13. 4.7 228 km SW of La Cruz de Loreto, Mexico
  14. 5.7 183 km SW of José María Morelos, Mexico
  15. 4.9 185 km SW of José María Morelos, 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.