QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

12 km W of Mayagüez, Puerto Rico

· 18 km deep · released about 4.2 tons of TNT

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10 km30 km60 km120 km N Hormigueros Municipio 16 kmRincón Municipio 16 kmAñasco Municipio 17 kmAguada Municipio 22 kmCabo Rojo Municipio 23 kmSan Germán Municipio 25 kmMoca Municipio 28 kmLas Marías Municipio 30 kmLajas Municipio 33 km
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 3.6 (md)
Depth
18 km below the surface
Felt
2 reports · strongest reported intensity IV
Nearest
Hormigueros Municipio, 16 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 605 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 4.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 40,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,300× the energy of this one
  4. This earthquake M 3.6 about 4.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 8.8× 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.

Where

Epicentre 18.1926, -67.2568. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hormigueros Municipio, PR 16 km (10 mi) WNW of here earthquakes near Hormigueros Municipio
Rincón Municipio, PR 16 km (10 mi) S of here earthquakes near Rincón Municipio
Añasco Municipio, PR 17 km (11 mi) SW of here earthquakes near Añasco Municipio
Aguada Municipio, PR 22 km (13 mi) SSW of here earthquakes near Aguada Municipio
Cabo Rojo Municipio, PR 23 km (14 mi) NNW of here earthquakes near Cabo Rojo Municipio
San Germán Municipio, PR 25 km (16 mi) WNW of here earthquakes near San Germán Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 3.1 8 km SSW of Guánica, Puerto Rico
  2. 2.4 3 km E of Maria Antonia, Puerto Rico
  3. 2.3 4 km ESE of La Parguera, Puerto Rico
  4. 2.4 3 km E of Maria Antonia, Puerto Rico
  5. 2.1 1 km NW of Indios, Puerto Rico
  6. 2.3 6 km ENE of La Parguera, Puerto Rico
  7. 2.5 6 km W of Fuig, Puerto Rico
  8. 3.3 3 km WSW of Puerto Real, Puerto Rico
  9. 2.3 3 km WSW of Indios, Puerto Rico
  10. 2.1 1 km NE of Palomas, Puerto Rico
  11. 2.1 6 km W of Fuig, Puerto Rico
  12. 2.4 6 km WSW of Fuig, Puerto Rico
  13. 2.1 1 km ESE of Lajas, Puerto Rico
  14. 3.4 5 km W of Fuig, Puerto Rico
  15. 2.5 3 km WSW of Guánica, Puerto Rico

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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.3 on 2020-07-03 — it released about 320 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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