QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

27 km W of Pole Ojea, Puerto Rico

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

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10 km30 km60 km120 km N Cabo Rojo Municipio 28 kmHormigueros Municipio 40 kmLajas Municipio 42 kmSan Germán Municipio 46 kmRincón Municipio 48 kmMayagüez Municipio 50 kmAñasco Municipio 50 kmSabana Grande Municipio 54 kmGuánica Municipio 55 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
6.3 km below the surface
Felt
no reports yet
Nearest
Cabo Rojo Municipio, 28 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1371 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 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,200× 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 17.9468, -67.4393. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cabo Rojo Municipio, PR 28 km (17 mi) WSW of here earthquakes near Cabo Rojo Municipio
Hormigueros Municipio, PR 40 km (25 mi) WSW of here earthquakes near Hormigueros Municipio
Lajas Municipio, PR 42 km (26 mi) W of here earthquakes near Lajas Municipio
San Germán Municipio, PR 46 km (29 mi) WSW of here earthquakes near San Germán Municipio
Rincón Municipio, PR 48 km (30 mi) SSW of here earthquakes near Rincón Municipio
Mayagüez Municipio, PR 50 km (31 mi) ESE of here earthquakes near Mayagüez Municipio

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

Aftershocks so far

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

  1. 3.0 2 km ENE of Mayagüez, Puerto Rico
  2. 2.2 3 km SW of La Parguera, Puerto Rico
  3. 2.5 5 km E of La Parguera, Puerto Rico
  4. 2.2 2 km S of Monte Grande, Puerto Rico
  5. 2.2 Puerto Rico region
  6. 2.4 3 km W of Palmarejo, Puerto Rico
  7. 3.0 5 km N of San Germán, Puerto Rico
  8. 3.0 1 km SSE of Monte Grande, Puerto Rico
  9. 2.1 4 km SSW of Monte Grande, Puerto Rico
  10. 1.9 Puerto Rico region
  11. 2.1 6 km WSW of Fuig, Puerto Rico
  12. 2.9 1 km ENE of Mayag?ez, Puerto Rico
  13. 2.2 6 km WSW of Fuig, Puerto Rico
  14. 2.2 6 km WSW of Guánica, Puerto Rico
  15. 2.3 3 km S of Monte Grande, 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 5.3 on 2020-07-03 — it released about 1,800 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.