QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

4 km WSW of Mayagüez, Puerto Rico

· 104 km deep · released about 1,600 lb of TNT

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10 km30 km60 km120 km N Hormigueros Municipio 9 kmAñasco Municipio 12 kmSan Germán Municipio 17 kmRincón Municipio 19 kmAguada Municipio 21 kmCabo Rojo Municipio 21 kmLas Marías Municipio 21 kmMoca Municipio 23 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
104 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 9 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1052 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 1,600 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 210,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,700× the energy of this one
  4. This earthquake M 3.1 about 1,600 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.7× 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 18.1877, -67.1762. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hormigueros Municipio, PR 9 km (5 mi) NW of here earthquakes near Hormigueros Municipio
Añasco Municipio, PR 12 km (7 mi) SSW of here earthquakes near Añasco Municipio
San Germán Municipio, PR 17 km (11 mi) WNW of here earthquakes near San Germán Municipio
Rincón Municipio, PR 19 km (12 mi) SSE of here earthquakes near Rincón Municipio
Aguada Municipio, PR 21 km (13 mi) S of here earthquakes near Aguada Municipio
Cabo Rojo Municipio, PR 21 km (13 mi) N of here earthquakes near Cabo Rojo Municipio

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

Aftershocks so far

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

  1. 1.9 2 km SSW of Indios, Puerto Rico
  2. 2.5 1 km SW of Indios, Puerto Rico
  3. 2.0 1 km NNE of Guayanilla, Puerto Rico
  4. 3.0 8 km SSE of Maria Antonia, Puerto Rico
  5. 2.5 2 km W of Guánica, Puerto Rico
  6. 2.5 2 km NW of Guayanilla, Puerto Rico
  7. 2.3 4 km ESE of Maria Antonia, Puerto Rico
  8. 2.5 4 km SW of Fuig, Puerto Rico
  9. 2.4 4 km SW of Guánica, Puerto Rico
  10. 2.4 3 km SW of Gu?nica, Puerto Rico
  11. 2.0 5 km SSW of Guánica, Puerto Rico
  12. 2.1 Puerto Rico region
  13. 1.8 5 km SW of Gu?nica, Puerto Rico
  14. 2.0 7 km SE of Maria Antonia, Puerto Rico
  15. 2.5 4 km SSW 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 6.4 on 2020-01-07 — it released about 75,000 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.