QuakeIndex

Earthquake · reviewed by a seismologist

M 5.6mww

101 km SW of Barra de Navidad, Mexico

· 10 km deep · released about 3.8 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 5.6 (mww)
Depth
10 km below the surface
Felt
13 reports · strongest reported intensity III
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 284 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 13 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.8 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 45× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2× the energy of this one
  3. Magna, Utah 2020 M 5.7 1.4× the energy of this one
  4. This earthquake M 5.6 about 3.8 kilotons of TNT
  5. Around the size people start to feel M 3.0 this one released 7,900× 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 6.3 on 2016-06-07 — about 11 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 18.4552, -105.2328. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 5.4 142 km SSW of Emiliano Zapata, Mexico
  2. 4.6 144 km SW of La Manzanilla, Mexico
  3. 4.5 145 km SSW of Emiliano Zapata, Mexico
  4. 4.3 141 km SSW of Emiliano Zapata, Mexico
  5. 4.6 126 km SSW of Emiliano Zapata, Mexico
  6. 4.4 149 km SW of Barra de Navidad, Mexico
  7. 4.2 132 km SSW of Barra de Navidad, Mexico
  8. 4.2 147 km SW of Barra de Navidad, 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.