QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mb

41 km SSW of Ixtapa-Zihuatanejo, Mexico

· 10 km deep · released about 15 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 4.0 (mb)
Depth
10 km below the surface
Felt
4 reports · strongest reported intensity III
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2770 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 4 people have reported feeling it to USGS.

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 17.2858, -101.6775. Map © OpenStreetMap contributors.

Aftershocks so far

17 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. 4.2 38 km SW of Ixtapa, Mexico
  6. 4.2 39 km SW of Papanoa, Mexico
  7. 4.2 16 km SW of Ixtapa, Mexico
  8. 4.4 26 km SSW of Petatlán, Mexico
  9. 4.2 20 km SW of San Jeronimito, Mexico
  10. 4.3 12 km SW of Ixtapa, Mexico
  11. 4.2 2 km SW of San Jeronimito, Mexico
  12. 4.0 14 km S of Palos Blancos, Mexico
  13. 4.1 47 km WSW of Ixtapa, Mexico
  14. 4.6 37 km SSW of Ixtapa, Mexico
  15. 4.2 20 km WSW of Papanoa, 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.