QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mb

14 km S of Palos Blancos, Mexico

· 17 km deep · released about 15 tons 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 4.0 (mb)
Depth
17 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2274 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 11,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 500× the energy of this one
  3. Magna, Utah 2020 M 5.7 350× the energy of this one
  4. This earthquake M 4.0 about 15 tons of TNT
  5. Around the size people start to feel M 3.0 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 5.0 on 2016-12-02 — about 32 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 17.4315, -101.3460. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 4.4 37 km SSW of Los Achotes, Mexico
  2. 4.2 36 km WSW of Papanoa, Mexico
  3. 4.4 26 km WSW of Papanoa, Mexico
  4. 3.9 0 km S of Colonia Aeropuerto, Mexico
  5. 4.7 8 km WSW of San Luis de La Loma, Mexico
  6. 4.9 2 km W of Coyuquilla Norte, Mexico
  7. 4.7 8 km SSE of Vallecitos de Zaragoza, Mexico
  8. 4.4 14 km S of Papanoa, Mexico
  9. 4.6 27 km NE of Petatlán, Mexico
  10. 4.4 15 km NNE of Petatlán, Mexico
  11. 3.8 near the coast of Guerrero, Mexico
  12. 5.2 6 km SSW of Papanoa, Mexico
  13. 4.2 39 km SW of Papanoa, Mexico
  14. 4.2 16 km SW of Ixtapa, Mexico
  15. 4.4 26 km SSW of Petatlán, 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.