QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

4 km SSW of Puerto Real, Puerto Rico

· 16 km deep · released about 1,300 lb of TNT

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10 km30 km60 km120 km N Cabo Rojo Municipio 6 kmHormigueros Municipio 14 kmLajas Municipio 19 kmSan Germán Municipio 19 kmSabana Grande Municipio 28 kmAñasco Municipio 28 kmGuánica Municipio 32 kmLas Marías Municipio 32 kmMaricao Municipio 32 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 3.1 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Cabo Rojo Municipio, 6 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1142 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 18.0418, -67.2053. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cabo Rojo Municipio, PR 6 km (3 mi) NNW of here earthquakes near Cabo Rojo Municipio
Hormigueros Municipio, PR 14 km (9 mi) SW of here earthquakes near Hormigueros Municipio
Lajas Municipio, PR 19 km (12 mi) WNW of here earthquakes near Lajas Municipio
San Germán Municipio, PR 19 km (12 mi) WSW of here earthquakes near San Germán Municipio
Sabana Grande Municipio, PR 28 km (17 mi) W of here earthquakes near Sabana Grande Municipio
Añasco Municipio, PR 28 km (18 mi) SSW of here earthquakes near Añasco Municipio

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

Aftershocks so far

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

  1. 2.4 Puerto Rico region
  2. 2.2 4 km SW of Guánica, Puerto Rico
  3. 1.5 4 km WSW of La Parguera, Puerto Rico
  4. 2.3 7 km WSW of Guánica, Puerto Rico
  5. 2.3 Puerto Rico region
  6. 2.5 4 km SW of Guánica, Puerto Rico
  7. 2.5 3 km SSW of Guánica, Puerto Rico
  8. 2.4 3 km ESE of Boquerón, Puerto Rico
  9. 2.6 2 km W of Guánica, Puerto Rico
  10. 2.3 11 km SSE of Maria Antonia, Puerto Rico
  11. 1.7 Puerto Rico region
  12. 1.7 Puerto Rico region
  13. 2.7 Puerto Rico region
  14. 2.2 2 km SW of Fuig, Puerto Rico
  15. 2.5 2 km S of Liborio Negron Torres, 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 6.4 on 2020-01-07 — it released about 89,000 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.