QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

Mona Passage

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

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10 km30 km60 km120 km N Cabo Rojo Municipio 9 kmHormigueros Municipio 16 kmSan Germán Municipio 22 kmLajas Municipio 23 kmAñasco Municipio 28 kmSabana Grande Municipio 31 kmRincón Municipio 31 kmLas Marías Municipio 34 kmMaricao Municipio 35 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
15 km below the surface
Felt
no reports yet
Nearest
Cabo Rojo Municipio, 9 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1039 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 6.7 260,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,200× 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 18.0588, -67.2403. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cabo Rojo Municipio, PR 9 km (6 mi) NW of here earthquakes near Cabo Rojo Municipio
Hormigueros Municipio, PR 16 km (10 mi) WSW of here earthquakes near Hormigueros Municipio
San Germán Municipio, PR 22 km (14 mi) WSW of here earthquakes near San Germán Municipio
Lajas Municipio, PR 23 km (14 mi) WNW of here earthquakes near Lajas Municipio
Añasco Municipio, PR 28 km (17 mi) SSW of here earthquakes near Añasco Municipio
Sabana Grande Municipio, PR 31 km (19 mi) W of here earthquakes near Sabana Grande Municipio

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

Aftershocks so far

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

  1. 2.4 3 km SW of Guánica, Puerto Rico
  2. 2.6 1 km NNE of Guayanilla, Puerto Rico
  3. 2.4 Puerto Rico region
  4. 2.3 Puerto Rico region
  5. 2.3 Puerto Rico region
  6. 2.8 3 km SW of Guánica, Puerto Rico
  7. 3.5 3 km SW of Guánica, Puerto Rico
  8. 2.4 12 km SSW of Stella, Puerto Rico
  9. 2.0 11 km SSE of Maria Antonia, Puerto Rico
  10. 2.6 9 km SSE of Maria Antonia, Puerto Rico
  11. 3.2 2 km SSW of Stella, Puerto Rico
  12. 2.4 2 km E of La Parguera, Puerto Rico
  13. 2.3 9 km SW of Guánica, Puerto Rico
  14. 2.3 1 km ENE of Indios, Puerto Rico
  15. 2.6 Puerto Rico region

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 92,000 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.