QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

9 km S of Lares, Puerto Rico

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

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10 km30 km60 km120 km N Lares Municipio 7 kmMaricao Municipio 9 kmAdjuntas Municipio 11 kmLas Marías Municipio 12 kmYauco Municipio 14 kmSabana Grande Municipio 17 kmSan Sebastián Municipio 17 kmUtuado Municipio 18 kmSan Germán Municipio 22 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
29 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Lares Municipio, 7 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1511 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

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 18.2120, -66.8610. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lares Municipio, PR 7 km (5 mi) S of here earthquakes near Lares Municipio
Maricao Municipio, PR 9 km (6 mi) ENE of here earthquakes near Maricao Municipio
Adjuntas Municipio, PR 11 km (7 mi) WNW of here earthquakes near Adjuntas Municipio
Las Marías Municipio, PR 12 km (8 mi) E of here earthquakes near Las Marías Municipio
Yauco Municipio, PR 14 km (9 mi) N of here earthquakes near Yauco Municipio
Sabana Grande Municipio, PR 17 km (10 mi) NNE of here earthquakes near Sabana Grande Municipio

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

Aftershocks so far

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

  1. 1.6 6 km WSW of Fuig, Puerto Rico
  2. 2.1 4 km SSW of Indios, Puerto Rico
  3. 3.0 6 km W of La Parguera, Puerto Rico
  4. 2.5 2 km ENE of Maria Antonia, Puerto Rico
  5. 1.8 5 km WSW of La Parguera, Puerto Rico
  6. 2.5 Puerto Rico region
  7. 2.4 4 km ESE of Indios, Puerto Rico
  8. 2.5 8 km SSE of Maria Antonia, Puerto Rico
  9. 2.6 7 km SSE of Maria Antonia, Puerto Rico
  10. 3.1 7 km ESE of Pole Ojea, Puerto Rico
  11. 2.0 5 km E of La Parguera, Puerto Rico
  12. 2.5 5 km WNW of Fuig, Puerto Rico
  13. 2.3 4 km W of Fuig, Puerto Rico
  14. 2.1 3 km SW of Guánica, Puerto Rico
  15. 2.2 5 km WSW 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.