QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

5 km W of Mayagüez, Puerto Rico

· 110 km deep · released about 1,500 lb of TNT

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10 km30 km60 km120 km N Añasco Municipio 11 kmHormigueros Municipio 12 kmRincón Municipio 16 kmAguada Municipio 19 kmSan Germán Municipio 20 kmMoca Municipio 22 kmLas Marías Municipio 23 kmCabo Rojo Municipio 24 kmSan Sebastián Municipio 27 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
110 km below the surface
Felt
no reports yet
Nearest
Añasco Municipio, 11 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 38 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 1,500 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 6.7 220,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,900× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.6× 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 18.2088, -67.1953. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Añasco Municipio, PR 11 km (7 mi) SW of here earthquakes near Añasco Municipio
Hormigueros Municipio, PR 12 km (7 mi) NW of here earthquakes near Hormigueros Municipio
Rincón Municipio, PR 16 km (10 mi) SSE of here earthquakes near Rincón Municipio
Aguada Municipio, PR 19 km (12 mi) S of here earthquakes near Aguada Municipio
San Germán Municipio, PR 20 km (13 mi) NW of here earthquakes near San Germán Municipio
Moca Municipio, PR 22 km (14 mi) SSW of here earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 2.1 7 km SSE of Guánica, Puerto Rico
  2. 2.2 5 km WSW of Guánica, Puerto Rico
  3. 1.8 9 km SSE of Guánica, Puerto Rico
  4. 3.0 31 km WSW of Stella, Puerto Rico
  5. 2.5 4 km SSW of Añasco, Puerto Rico
  6. 1.8 2 km NW of Fuig, Puerto Rico
  7. 2.9 1 km WSW of Guayanilla, Puerto Rico
  8. 2.4 6 km S of Guánica, Puerto Rico
  9. 3.4 36 km WSW of Stella, Puerto Rico
  10. 2.6 3 km SW of La Parguera, Puerto Rico
  11. 2.6 2 km WSW of La Parguera, Puerto Rico
  12. 2.0 2 km WNW of Indios, Puerto Rico
  13. 2.3 3 km S of Palmarejo, Puerto Rico
  14. 2.1 4 km WSW of Fuig, Puerto Rico
  15. 2.3 20 km SW of Stella, 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 78,000 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.