QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

8 km WSW of Mayagüez, Puerto Rico

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

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10 km30 km60 km120 km N Hormigueros Municipio 11 kmAñasco Municipio 16 kmRincón Municipio 19 kmCabo Rojo Municipio 20 kmSan Germán Municipio 20 kmAguada Municipio 23 kmLas Marías Municipio 26 kmMoca Municipio 27 kmLajas Municipio 28 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
91 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 11 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 954 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 18.1698, -67.2168. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hormigueros Municipio, PR 11 km (7 mi) WNW of here earthquakes near Hormigueros Municipio
Añasco Municipio, PR 16 km (10 mi) SW of here earthquakes near Añasco Municipio
Rincón Municipio, PR 19 km (12 mi) S of here earthquakes near Rincón Municipio
Cabo Rojo Municipio, PR 20 km (12 mi) N of here earthquakes near Cabo Rojo Municipio
San Germán Municipio, PR 20 km (13 mi) WNW of here earthquakes near San Germán Municipio
Aguada Municipio, PR 23 km (14 mi) S of here earthquakes near Aguada Municipio

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

Aftershocks so far

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

  1. 3.3 2 km WNW of Fuig, Puerto Rico
  2. 3.2 4 km WSW of Fuig, Puerto Rico
  3. 2.5 5 km NW of Mayagüez, Puerto Rico
  4. 2.0 2 km N of Fuig, Puerto Rico
  5. 2.3 2 km W of Yauco, Puerto Rico
  6. 2.2 7 km NNW of Puerto Real, Puerto Rico
  7. 2.1 1 km SSW of Yauco, Puerto Rico
  8. 2.1 0 km ENE of Palomas, Puerto Rico
  9. 2.5 2 km SE of Indios, Puerto Rico
  10. 2.1 3 km SE of Maria Antonia, Puerto Rico
  11. 2.0 8 km SE of La Parguera, Puerto Rico
  12. 2.3 4 km WSW of Fuig, Puerto Rico
  13. 2.2 3 km NW of Fuig, Puerto Rico
  14. 2.3 5 km SW of La Parguera, Puerto Rico
  15. 2.2 2 km NNW of Indios, 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.