173 km SW of La Manzanilla, Mexico

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 3 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 5.8 on 2016-06-02 — about 2 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 17.9986, -105.7310. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 4.3 153 km SSW of Emiliano Zapata, Mexico 10:52 UTC
2. 5.3 175 km SW of Emiliano Zapata, Mexico 10:21 UTC
3. 5.7 183 km SSW of Emiliano Zapata, Mexico 10:16 UTC
4. 5.4 142 km SSW of Emiliano Zapata, Mexico 19:05 UTC
5. 4.6 144 km SW of La Manzanilla, Mexico 16:41 UTC
6. 4.5 145 km SSW of Emiliano Zapata, Mexico 16:34 UTC
7. 4.2 163 km SSW of Emiliano Zapata, Mexico 08:56 UTC
8. 4.2 151 km SW of Emiliano Zapata, Mexico 05:53 UTC
9. 4.3 141 km SSW of Emiliano Zapata, Mexico 05:42 UTC
10. 4.2 171 km SW of Emiliano Zapata, Mexico 10:28 UTC
11. 4.6 126 km SSW of Emiliano Zapata, Mexico 00:53 UTC
12. 4.4 149 km SW of Barra de Navidad, Mexico 10:36 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:50 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

• The official USGS event page — the source of record for every value above
• Did you feel it? Report it to USGS — reports go to USGS, not to us
• ShakeMap for this event, when USGS has produced one

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.