QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

6 km WNW of Las Marías, Puerto Rico

· 8.0 km deep · released about 1,300 lb of TNT

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10 km30 km60 km120 km N Las Marías Municipio 8 kmAñasco Municipio 9 kmSan Sebastián Municipio 11 kmMoca Municipio 13 kmMaricao Municipio 16 kmHormigueros Municipio 16 kmSan Germán Municipio 17 kmLares Municipio 19 kmAguada Municipio 19 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
8.0 km below the surface
Felt
no reports yet
Nearest
Las Marías Municipio, 8 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2248 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 1,300 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 6.7 260,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,200× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 18.2638, -67.0483. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Las Marías Municipio, PR 8 km (5 mi) WNW of here earthquakes near Las Marías Municipio
Añasco Municipio, PR 9 km (6 mi) ESE of here earthquakes near Añasco Municipio
San Sebastián Municipio, PR 11 km (7 mi) SW of here earthquakes near San Sebastián Municipio
Moca Municipio, PR 13 km (8 mi) SSE of here earthquakes near Moca Municipio
Maricao Municipio, PR 16 km (10 mi) NW of here earthquakes near Maricao Municipio
Hormigueros Municipio, PR 16 km (10 mi) NNE of here earthquakes near Hormigueros Municipio

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

Aftershocks so far

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

  1. 2.7 7 km S of Indios, Puerto Rico
  2. 3.6 3 km NW of Tallaboa, Puerto Rico
  3. 2.6 9 km SSE of Guánica, Puerto Rico
  4. 2.6 6 km ESE of La Parguera, Puerto Rico
  5. 2.2 1 km SW of Guayanilla, Puerto Rico
  6. 3.0 1 km E of Santo Domingo, Puerto Rico
  7. 3.1 5 km SSE of Maria Antonia, Puerto Rico
  8. 2.7 1 km N of Guayanilla, Puerto Rico
  9. 2.9 2 km N of Guayanilla, Puerto Rico
  10. 2.6 6 km SSE of Guánica, Puerto Rico
  11. 2.2 3 km SW of Indios, Puerto Rico
  12. 2.5 5 km SW of Guánica, Puerto Rico
  13. 1.9 2 km W of Guánica, Puerto Rico
  14. 2.1 3 km SSE of Guánica, Puerto Rico
  15. 3.1 6 km ESE of La Parguera, 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 92,000 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.