QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

4 km SW of Mayagüez, Puerto Rico

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

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10 km30 km60 km120 km N Hormigueros Municipio 7 kmAñasco Municipio 13 kmSan Germán Municipio 16 kmCabo Rojo Municipio 20 kmRincón Municipio 20 kmLas Marías Municipio 21 kmAguada Municipio 22 kmMoca Municipio 24 kmMaricao Municipio 25 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
102 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 7 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1550 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 6.7 270,000× 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 8,500× 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 1.3× 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 18.1758, -67.1697. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hormigueros Municipio, PR 7 km (5 mi) NW of here earthquakes near Hormigueros Municipio
Añasco Municipio, PR 13 km (8 mi) SSW of here earthquakes near Añasco Municipio
San Germán Municipio, PR 16 km (10 mi) WNW of here earthquakes near San Germán Municipio
Cabo Rojo Municipio, PR 20 km (12 mi) N of here earthquakes near Cabo Rojo Municipio
Rincón Municipio, PR 20 km (12 mi) SSE of here earthquakes near Rincón Municipio
Las Marías Municipio, PR 21 km (13 mi) WSW of here earthquakes near Las Marías Municipio

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

Aftershocks so far

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

  1. 2.5 5 km WSW of Fuig, Puerto Rico
  2. 2.2 3 km SSW of Guánica, Puerto Rico
  3. 2.2 2 km S of Guánica, Puerto Rico
  4. 3.5 2 km S of Guánica, Puerto Rico
  5. 2.3 1 km S of Guánica, Puerto Rico
  6. 2.1 9 km SSE of Maria Antonia, Puerto Rico
  7. 2.7 11 km SSE of Maria Antonia, Puerto Rico
  8. 2.0 5 km SSW of Liborio Negron Torres, Puerto Rico
  9. 2.1 3 km WNW of La Parguera, Puerto Rico
  10. 2.0 6 km WSW of Guánica, Puerto Rico
  11. 1.9 3 km SW of Indios, Puerto Rico
  12. 2.1 4 km SSE of Maria Antonia, Puerto Rico
  13. 2.1 4 km SSW of La Parguera, Puerto Rico
  14. 2.0 3 km WSW of Guánica, Puerto Rico
  15. 1.9 2 km WNW of Guayanilla, 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 95,000 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.